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F.p�E12--S Cs7N�te-A4c.T1O LLC OFFICE COPY CITY OF TIGARD REVIEWED FOR CODE COMPLIANCE Approved: OTC: 1 Permit#: rns-)-a 0 1 $-00 0 9 6 Address: 07 R© ) J y A\/ Suite#: kr: Date: !4 ._ U/ N� .�►; ; Deck Desjn " Guide de One and Two wo fa �,,, r The B mily Residential p Bureau of Development Dwellings infor pment Servic gs ' • oration (SOS) is pass insto help you design ou es is providing and Y deck help inspections. The ' obtain this p you determine standards and a building permit ledgers need how large the footin details in this mit and to be; Guide wiNhow to fasten hOw to build lateral braeseams'foists Do 1 Needtake into all of the 9 stairs, ' posts, and A Permit d?.account pieces together. and r 'Cr ', as drains conditions which ma This does dings; What Plans Do 1 2� ge conditions, slo Y affect Guide Need?` �n excess pe conditions your deck not14of the standard desi 2 situation, you unifor ' °rdecks su gn suchGeneral Notes.....engineer maY need hire m loads. pe pporting loads 1" pn°r to approval a licensed arche'cgor st►ucturon your aeCificFootings,Beams,Joists,and Posts.........4�y You may include all, or ••.4Wdetails in this part of the The Ledger Board.,.guide With pre-approved desiYour 7 Z - For one_and building permit design standards and alSupport L_ two- laFreestanding Decks Lt. family dwelling '•" plans for decks 1} O Q. - Single-span s that are: Lateral Su • PPort of pecks..................... -..t .. - 1t:i:: ; l71S a s- hot tub or pa gs. .. .o d .. .. .....che ...................... 13 W o concrete block us overhangs, bay wind Guardrails,,,, to e O '� - Not more than }p a windows, brick, stone or Stairs... 13 feet Mabove the " Not bearing on """ 18 ground Chimneys/Ba oNo for everyground with a slope y Windows........ .,, 1 foot vertical pe greater Deck Framing "" 20 m than � feet horizontal g Plan...... 11 _ Guard Helpful Information... ...... ...... ..21 Coo 22 , Z � 1110© o Ledger f fboard d 01 L7 �� � 1III/! IRrjoistIo m / cc ,moo kilr 4 Footing \\ • 1111." cc z Grade U ti CZ F2 \ ' Led © atta hment rd ar 1`0 '�" �`1...,- � Joist " Post �- Built-up beam �� to beam 1.. o connection clv � i .../....- DECK DECK DESIGN GUIDE • 1 Introduction Do I Need A Permit For My Deck? A building permit is required for all decks that are more than 30 inches above the ground at any point. See Brochure 3, Fences,Decks and Outdoor Projects. Setbacks and Other Regulations? For information on setbacks (how close a deck is to a property line) and other regulations that may apply to your deck project, even when a building permit is not required, see Brochure 3. Call Planning and Zoning at 503-823-7526 to find f out what zoning requirements apply to your specific property. �s How Do I Get A Building Permit? X11' ° See BDS handout, Brochure 1, Guide to Permits and Inspections. This handout , describes the building permit process from application to final inspection. ,i11.' What Plans Do I Need? You may draw all your own plans and details without using this Guide, or you ,. mayuse the pre-approvedpp standards and details in this Guide to supplement 4 �' r your plans. Refer to Brochure 6, What Plans Do/Need for a Building Permit? r' for descriptions and examples of the plans needed to obtain a building permit for a typical residential construction project. Since a deck can be a relatively ' simple project, you will only be required to provide the plans listed below if you use this Guide: ▪ Site Plan-You will need to draw a site plan. The Site Plan must show the property lines, outlines of all existing and proposed buildings, paved areas and decks on the lot, and the distances from your proposed deck to the V� k �^j`s�g v <' apel " nearest property lines. See Brochure 6 for Site Plan requirements and a �'' ti y Pk sample Site Plan. r i; j _ �' to - Elevation View- You will also need to draw an Elevation View, which is a ," ®I ' !! kottly,.-. front or side view of your house and the proposed deck and the level of the 7' 4/;i k u '1I%1 ground adjacent to the deck (see Brochure 6). d . • Framing and Foundation Plan- You can draw your own Framing and Foundation Plans (see Brochure 6) or you can complete the Worksheet and Typical Deck Plan at the end of this Guide. • Cross Section and Details- You can draw your own Cross Section and Details (see Brochure 6) or you can use the details in this Guide. Your plans \R? must include details of the following parts of your deck: • Ledger board attachment • Joist-to-beam connection • Rim joist connection y IOW - ‘Ircs...441111'. • Post-to-beam connection jY. ` #1, • Lateral support method 3c . R 4A.1‘ • Guardrail height and openings a b , • Guardrail post attachment ` �� h • Stair and stair handrail details • Post-to-footing connection • 2 • DECK DESIGN GUIDE General Notes ,i7 , -, -4„. 1 All lumber shall be grade #2 Douglas-Fir, Hem-Fir, or better and shall be `" , i ' ,.44k-i,2;,,...--1., pressure treated (to resist insect and dry rot) in accordance with American Wood-Preservers' Association Standards (Category). Deck surface and trim , pl,� material of redwood, cedar, or other wood with a natural resistance to " ,r`,s t,l( °` ` � decay does not require pressure treatment. The level of treatment depends ' ' on the use as follows: ' e; z a.Decking material, railings,joists, and beams must be treated to a Category --- I' UC3B (or must be other wood with a natural resistance to decay). ft , 4464 y ' b.Posts and other woods located on, in, or in contact with the ground must ' y ( be a Category UC4B. fi 174'''4'''.‘ k I _ c.Any wood less than six inches above the ground or in contact with .,‘'-',‘,..k ,7 concrete must be a Category UC4A. The level of preservative treatment is noted on the tags on the ends of the wood members. Remember, any time you make a cut, treat the cut end of the wood with a paint-on preservative. Cut ends expose the inner untreated wood to potential moisture and insect damage. Hardwood and plastic or composite decking products may be substituted for conventional wood decking, but installation and span lengths of the substituted material must be in strict conformance with the product listingand the manufacturer's installation instructions. Copies of the�.r�� f�l� ;, ` r p. manufacturer's installation instructions must be submitted with the building permit application. - -`. ' 1.All nails shall be common or box galvanized. It is recommended that common .. L; nails be used. They have a thicker shank and are stronger than box nails. { s _' 3.New pressure treatment methods use chemicals that will prematurely corrode standard fasteners, hardware, and flashing when in contact with pressure treated lumber; and as a result, fastener and hardware requirements have changed. Note the following: a.All screws and nails shall be hot-dipped galvanized or stainless steel. b.All hardware (bolts, nuts and washers, joist hangers, mechanical fasteners, holdowns, tie plates cast-in-place post anchors, etc.) shall be i galvanized with 1.85 oz/sf of zinc (G-185 coating) or shall be stainless Vsteel. Look for products such as "Zmax" from Simpson Strong-Tie or " " from USP. t . ,'il, , ',: 4,All deckingTripleZincmaterial shall be 2x4, 2x6, or five quarter (5/4") boards. Attach l ' I'',, II/11111111i $ decking to each joist with two 10d nails or two #8 screws. Decking may be ''I 1 , IN ' .'t,+ ,r placed from an angle perpendicular to the joists to an angle of 45 degrees to i _ • the joists. Decking must have a span length such that each board bears on a —,00-• minimum of two joists. f 4 5.Headers over existing doors, windows or openings greater than six feet in width that are located below a deck that will be attached to the house must be checked to verify that those headers can support the additional load added by the deck. 6.The bottom of all footings for decks that are attached to a house are to be placed a minimum of 18 inches below the surface of the finished grade and must bear on firm, undisturbed native soil. The bottom of footings for free-standing decks may be at any depth on undisturbed native soil. Footings adjacent to the top of a retaining wall must be set back from the wall a distance equal to the height of the wall, or be extend below grade an amount equal to the height of the retaining wall. DECK DESIGN GUIDE • 3 Footings, Beams, Joists, and Posts First, decide how long and wide you want your deck. (Note: The drawings in this Guide indicate square or rectangular configurations, however, decks can be any shape as long as the longest joist and beam spans are used to determine the beam,joist, and footing sizes.) Your deck can have up to a two-foot maximum joist and/or beam overhang. See Figures 1, 2, and 3. Beams must be supported on each end by a post and cannot be supported with beam hangers off the house. Use Table 1 to find the minimum beam, joist and footing sizes. Joists are identified as "A", beams as "B", posts as "C," and footings as "D." It is recommended that you first determine the joist span, and then note what beam and footing sizes you will need. Optional overhang The span of a joist is measured from the centerline of bearing ■ • ■ k ■ at one end of the joist to the centerline of bearing at the other — — � and does not include overhangs. Maximum joist span lengths are Blocking noted in Table 1. See Figures 1 and 2 for joist Beam "B" span types. Joist "A" Post"C" — Footing "D" 2'-0" max. Joist span /— overhang (Min. span = 6'-0"with overhang) AFig. 1:Joist span, deck attached at house Optional overhang Blocking rl \ A [ , C .J J 2'-O" max. Joist span 2'-0" max. overhang 'I (Min. span = 6'-0"with overhang) .-7, AFig. 2:Joist span, freestanding deck 4 • DECK DESIGN GUIDE Optional overhang iftl If N 0 0 I 0 0 0 i R [3 A Beam splices at interior post 4 C locations only D /.--- :—6" min __ __ J I / _._ J / 2'-O" max. Beam span overhang / (Min. span = 6'-O"with overhang) / Beam s an / AFig. 3:Beam span Table 1 provides you with the information to determine the minimum sizes of the footings, beams, and joists. The sizes will depend on how big the deck will be and how many footings and posts are going to be used; how far the beam(s) will span from post to post, or post to ledger; and how far the joist will span from beam to beam, or beam to ledger. Note: The sizes, spans and spacing of the joists in Table 1 are the minimum/maximum allowed by code. If you want your deck to be stiffer, increase the size, reduce the span, or reduce the spacing of your joists. Note: The footings must bear on native soil. The footing details require a footing that is a minimum of 24 inches in height so the bottom can be located a minimum of 18 inches below the finished grade and extend six inches above the finished grade. If you have fill material that is greater than 18 inches deep, your footing will need to extend through the fill to native soil. Footings for freestanding decks (those not attached to the house) are not required to be located 18 inches below the finished grade and can have a minimum thickness of eight inches. Post sizes are 4x4 minimum for decks six feet or less above the ground and 4x6 for decks over six feet above the ground. Use a minimum 4x6 post under all beam splices. Mark the sizes, spacing and spans for the footings, beams, joists, and posts from Table 1 in the space provided below: O` x t d �, A. Joist Size: , spaced �y apart. B. Beam Size: I x t . L. 0 C. Post Size: q x L , spaced 7 (O apart. D. Footing Size: Is x r8 x4..f. , Transfer your footings, beams,joists, and posts information above into the Deck Framing Plan at the end of this Guide DECK DESIGN GUIDE • 5 TABLE 1 If you have a and you have then you and the beam"f3"that is: osts C . and they can and the footings"D" P „ " can only minimum size be spaced a supporting the posts supporting the span the joist you can maximum of: must be a minimum size beam spaced: joists: use is: of (WxWxH): 4x8 or (2) 2x8 6'-O"apart 6'-0" 2x6* 24" apart 13x13"x24"deep or 4x10 or (2) 2x10 8'-6"apart 6'_0" 14" diameter x 24"deep 2x6* 24" apart 15x15"x24" or 17"diameter x 24"deep 4x12 or (2) 2x12 10'-6"apart 6'_0" 2x6* 24" apart 16"x16"x24" or 4x12 11'-9" apart 6'-0" 2x6* " 24 18" diameter x 24" deep apart 18"x18"x24" or 20" diameter x 24" deep 4x8 or (2) 2x8 6'-0"apart g'_p�� 2x6* or 2x8 16" apart or 24" 14x14"x24" or apart 16" diameter x 24"deep 4x10 or (2) 2x10 8'-0"apart 8'-0" 2x6* or 2x8 16" apart or 24" 16"x16"x24" or apart 18" diameter x 24"deep 4x12 or (2) 2x12 9'-6" apart 8'-0" 2x6* or 2x8 16" apart or 24" 18"x18"x24" or apart 20" diameter x 24" deep 10 -9 4x12 " apart 8'-0"P 2x6* or 2x8 16" apart or 24" 18"x18"x24" or apart 20" diameter x 24" deep 4x8 or (2) 2x8 5'-6" apart 10'-0" 2x8 or 2x10 16" apart or 24" 14"x14"x24" or apart 16"diameter x 24"deep 4x10 or (2) 2x10 7'-6"apart 10'-0" 2x8 or 2x10 16"apart or 24" 16"x16"x24" or apart 18"diameter x 24"deep 4x12 or (2) 2x12 9'-0"apart 10'-0" 2x8 or 2x10 16"apart or 24" 18"x18"x24" or apart20"diameter x 24" deep 4x12 10'-3" apart 10'-0" 2x8 or 2x10 16" apart or 24" " " " apart 2320" diameterx20x24xor 24"deep 4x6 or (2) 2x8 5'-0" 12'-0" 2x10 or 2x12 16" apart or 24" 14"x14"x24" or apart 16" diameter x 24" deep 4x8 or (2) 2x10 6'-6" 12'-0" 2x10 or 2x12 16"apartapart or 24" 18"16"x16"x24diameter"x or24" deep 4x12 or (2) 2x12 8'-6" 12'-0" 2x10 or 2x12 16"artapart or 24" 18" 20"x18diameter"x24" or24"deep 4x12 9'-6" 12'-0" apx 2x10 or 2x12 16" apart or 24" 20"x20"x24" or apart 22" diameter x 24" deep 4x6 or (2) 2x8 4'-6" 16'-0" 2x12.. 16" apart 15"x15"x24" or 4x8 or (2) 2x10 6'-0" 17"diameter x 24"deep 16'-0" 2X12 16" apart 18"x18"x24"or 4x10 or (2) 2x12 7'-6" 20" diameter x 24"deep 16'-0" 2X12 16" apart 20" 23"x20diam"x24eter"x or 24"deep 4x12 9'-0" 16'_0" 2x12 16" apart 22"x22"x24" or * 2x6 joists cannot be used where a guardrail is required. 25" diameter x 24"deep 6 • DECK DESIGN GUIDE Exterior sheathingIIII I Continuous flashing (15/32" max) (See Fig. 5) Existing wall Existing 2X rim (band) Decking over I deck joist ilk Sp Joist Span pacing 2X floor joist - 0 < span < 8' 36" 8' < span < I 1 2X ledger with 1/2" dia. bolts 10' 34" Existing wall framing IP staggered at spacing"S". 10' < span < 14' 24" or concrete wall_____. Locate first bolt 2"from end 14' < span < 16' 21• (shown dashed) of ledger From table R502.2.2.1 of 2011 ORSC. AFig. 6:Attachment of Ledger Board to Band Board with Thru-Bolts (See Fig. 12 for spacing and clearances) Exterior sheathing _i♦ Remove siding at ledger min. thickness = 3/8" location prior to installation Continuous flashing (See Fig. 5) Existing wall stud // d -- ......r /.r A 410 Ai U 1" min. _ � Fasteners at 16" O.C. per table 2X ledger Required fasteners to each stud Joist Span or(16 inches o.c.max.) Joist span 1/4"X 41/2" #10.5"Wood Simpson SOS Screws Screws 0 < span < 8' 2 3 8' < span < 10' 2 ____� 4 10' < span < 14' 2 5 A Fig. 7:Attachment of Ledger Board to 14' < span < 16' Wall Studs with Screws 2 6 8 • DECK DESIGN GUIDE Concrete wall Decking over /deck joist %/ %///. %////%' 11, 2" min. Joist Span Spacing 2X ledger with 1/2" dia. "S'1 expansion anchors o < span <8' 18" staggered at spacing 8' < span < 10' 15" "S" with minimum 21/2" 10' < span < 14' 10" embedment 14' < span < 16' 9" AFig. 8:Attachment of Ledger Board to Concrete Wall (See Fig. 12 for spacing and clearances) Prohibited Ledger Attachments:Attachments to the ends of premanufactured open web joists, to brick veneers, and to house overhang/bay windows are not allowed when using this Guide (see Figures 9, 10 and 11). In such cases the decks shall be free-standing (see Free-Standing Decks). open web t floor joistsrIJ __ lq'lllfl6�1 F 1 deck MIK `1 deck ' hIIU �` �I ,4 a 01st l'a oast (i' I ,. �� 11111 il r.47-Wa,o brick o ' a mais �� • eer 3 N �i I Fig. 9:No attachment Fig. 10:No attachment Fig. 11:No attachment to open web trusses to brick veneer to house overhang 2"to 5" max from end /.( o e t " Staggered fasteners_ f - -- -0 o top to 2"/ bottom Spacing "S'/ AFig. 12:Ledger Board Fastener Spacing and Clearances DECK DESIGN GUIDE • 9 The Ledger Board Decks that are attached to a house require a ledger board to be fastened to the house structure, and the deck joists are fastened to the ledger. If your deck will be free-standing and not attached to the house, skip this section and proceed to Free-Standing Decks. There are several methods for attaching the ledger to the house, depending on how the house was built and how high the deck will be located relative to the house's existing floor framing. The ledger can be fastened to the house band board (or rim joist) (Figure 5 or 6), the wall studs (Figure 7) or a concrete wall (Figure 8). You will need to verify the existing conditions before you apply for a building permit. If you can't verify the existing conditions or if they are different from Figures 5, 6, 7 or 8 then a free-standing deck is required (see Free-Standing Decks). Siding and Flashings:The siding or exterior finish system must be removed to install the ledger board against the wall sheathing. Two layers of continuous flashing must be properly installed to prevent water from getting the siding has been removed. See Figure 5. The flashing material maybe copperg er , into the steel,less where galvanized steel coated with 1.85 oz/sf of zinc (G-185 coating), UV-resistant plastic, or self-sealing Ing bituminous (ta ) "peel- and-stick" flashing. The first layer is attached directly to the exterior wall sheathing starting behind and above the bottom edge of the building paper and siding, continuing straight down the face of the wall behind the ledger board (before it is Il installed) and ending on the Exterior wall sheathing First layer flashing behind building outer face of the exterior wall (15/32max sheathing) Second layer"Z"flashing over top and ledger board, and over siding siding or foundation below the bottom of the ledger board. Existing wall and down face of ledger board Self-sealing bituminous peel- �-C and-stick flashing is ideal for ■L� /// %//// //, Decking over the first layer. Pre-formed Existing 2X i' Z-shaped metal flashing is ideal rim (band) r II deck joist for the outer, second layer of flashing. It is installed after 2X floor joist , 2X ledger, same size the ledger board as deck joist and before ' ' the joists, starting behind and 6....,...- Joist hanger LUS26above the bottom edge of Ithe building paper and siding, (or equal) min. continuing down vertically to Existing wall framing 1 ,_ 1/2" lag screws or the top of the ledger board, or concrete wall 1/4"X41/2" Simpson SDS screws bending horizontally to the (shown dashed) ( (or equal) staggered from to to bottom outer face of the ledger board, pand bending again vertically and spaced at spacing "S" down the face of the ledger board at least 1/2". AFig. 5:Attachment of Ledger Board to Band Board with Lag or Wood Screws (See Fig. 12 for spacing and clearances) Spacing"5" ' 640°Ww-°° Joist Span 1/2"dia.lag screws*! Simpson SDS 1/4"X 41/2" i 0 < span < 8' 23" 14" 8' < span< 10' 12" �. X 10' < span < 14' 13" 8" 14' < span < 16' 11" 6" *The tip of lag screw shall fully extend beyond inside face of rim joist!From table 8502.2.2.1 of 2011 ORSC. ' 0 °4° Manufactured Wood Joists(MWJs): If the existing house floor joists are MWJs, and note solid-sawn lumber, you will need to submit a ledger attachment detail that is approved by the MWJ manufacturer or a licensed engineer. Examples of MJWs are TJI, GPI and LPI. See Figure 4. Older homes constructed with MWJs may have a plywood band board, • Fig. 4:MWJ profile while some newer homes may have 1 1/4-inch manufactured wood rim joists. DECK DESIGN GUIDE • 7 • Ledger Board Fasteners All fasteners shall be spaced per the tables provided with Figures 5, 6, 7 and 8 and shall be installed per Figure 12. All fasteners shall be installed with washers and thoroughly tightened. Thru-bolts:Thru-bolts are those where a hole is drilled all the way through the wood members and a nut and washer are attached to complete the connection. Thru-bolts shall have a minimum diameter of %2". Lead (pilot) holes for thru-bolts shall be 17/32"to 9/16" in diameter. Thru-bolts must be equipped with washers at the bolt head as well as the nut. Expansion(Wedge)Anchors: Use expansion anchors when attaching a ledger board to a concrete wall as shown in Figure 8. Bolt diameters of the anchors shall be a minimum of %2"; in some cases, this may require an anchor size of 5/8". Minimum embedment length shall be 2%2". Expansion anchors must have washers. Expansion anchors must be installed as required by the manufacturer's instructions. This may include cleaning the holes drilled in the concrete to ensure they are free of dirt, debris, and moisture. Improper installation of the anchors can result in catastrophic failure and collapse of the deck. Adhesive Anchors: Adhesive anchors may be used with a design by a licensed structural engineer. Special inspections are required for expansion anchors and adhesive anchors. They are performed by third-party inspectors that are hired by the project owner. The special inspector verifies that the expansion or adhesive fasteners are installed correctly and submits a report to the owner and the City. Lag Screws: Lag screws shall have a diameter of 1/2" and shall be hot-dipped galvanized or stainless steel. Lag screws may be used only when the field conditions match those shown in Figure 5. See Figure 13 for lag screw length and shank requirements. All lag screws shall be installed with washers. Lag screws must be hot dipped galvanized or stainless steel only 1/2"dia. 1 1111Yratill at Screw must penetrate beyond and board/rim joist a minimum of 1/2" 11/2" shank Length must extend through (no threads) ' existing band board/rim joist AFig 13:Lag screw requirements Lag Screw Installation Requirements: Each lag screw shall have lead (pilot) holes drilled as follows: 1) drill a 1/2" diameter hole in the ledger board, 2) drill a 5/16" diameter hole into the solid connection material of the existing house. DO NOT DRILL A 1/2" DIAMETER HOLE INTO THE SOLID CONNECTION MATERIAL. The threaded portion of the lag screw shall be inserted into the lead hole by turning. DO NOT DRIVE WITH A HAMMER. Use soap or a wood-compatible lubricant as required to help facilitate tightening. Each lag screw shall be thoroughly tightened. Simpson SDS Screws or Equivalent:Install per manufacturer's instructions. Mark the size of the ledger board and the fastener type, size, and spacing in the spaces below: Ledger Size: D x to , fastened with S� p..500 SDS At x sYa-• , spaced Lei, apart. Transfer your ledger information above into the Typical Deck Plan at the end of this Guide. 10 • DECK DESIGN UIDE Freestanding Decks Decks that are free-standing do not utilize the exterior wall of the Rim joist existing house to support vertical or lateral loads. Freestanding decks allow the exterior siding to remain on the house, so there is les opportunity for _ water to get into the wall st ucture. =� 11 Freestanding decks ray use precast ��/ ' footing pads set 12" below the surface // r of the ground on firm, undisturbed �1� ' Joist / 41 native soil. Rim ,� °Ali overhang joist 1 �i'� Freestanding decks require an additional • Joist beam, posts and footings, instead of a Grade 4&%4%. �� ledger board attached to thehouse. Illk ��i ,ii011 `/ AFig. 14:Freestanding deck Lateral Support Decks more than 3G inches :bove grade must resist lateral forces (wind and earthquake) with diagonal cross bracing as shown in Figure 15.j Bracing shall be located between posts parallel to beams and bolted with a 3/8"diameter through- bolt at each end to he post. as shown. Diagonal bracing shall also be located perpendicular to beams. Bracing is required in every other bay etween posts for decks with joist spans up to 8 feet, and in every bay for decks with joist spans greater than 8 feet. If the deck is free-standing, diagonal bracing must be provided on all the posts and in both directions. I — - ---I— — — I .. - - 1- -r ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ • `1 • • • • •• Calla illy Milli l (1)3/8"dia.throng bolt • • at each cc nnectio 2X6 cross brace 11\ • • 1117114 r as B 0 • o • • i I — -14 Solidjblock at intersection of wood Bracing required every bay for deck with joist spans>8' braces with(1)3/8"dia.through bolt(typ) Bracing required alternate bays with joist spans_<8' A Fig.15:Diagona/bracing DECK DESIGN GUIDE • 11 FramingConnect. ions Joist Hangers: Jois hangers Mechanical fasteners may be (see Fig. 16) shall lave a (3)8d toe installed in lieu of toe-nails minimum capacity ,•if 1,000 nailed pounds. Joist hang rs used . Joists ----- .- shall be manufactued for i their intended lumb-r size. , I Joist-to-Beam Con ection: il .4 Each joist shall be ttached !( to the beam as sho n in Fig. 16 or 17. fi, AFig.16: Typical joist hangers ®Fig.17:Joist-to-beam detail I Secure decking to top or rim joist with#10X3"min. Rim Joists:Attach a continuous rim joist Joists I wood screw at 6"O.C. to the ends of joists as shown in Figure 18. Note that the rim joists are required at both ends of joists in free-standing • decks. Minimum rim joist dimensions • shall be equal to the dimensions of • • • the joist. Built-up Beams: Built-up beams shall be Attach rim joist to end of each assembled in accordance with Figure 19. )40 i joist with (5)#10X3"min. The nailing pattern shall be staggered ( wood screws as shown. \__Rim joist Post-To-Beam Connection:The post- to-beam connection shall be made with premanufactured mechanical connectors as shown in Figure 20. Post-to-beam A Fig. 18:Rim joint connection connections may also be accomplished 10d nail or#10 (2)fasteners, using a minimum 6x6 post notched for a wood screw, typ each end 4x beam as shown in Figure 21. All thru- I bolts shall have washers at the bolt head and nut. 11111 typ. typ. A Fig. 19:Built-up-beam 2" min.-----11 (2) 1/2"dia. through Post to beam " (2)2X beam .. �i bolt and washers connector or 4X beam (2)2X beam - 111 1_ iii or 4X beam -.,�„ „_• , id.� 11/2" min..�ir iII Notch post to accommodate beam 4X4 min. 6X6 min. AFig. 20-Post-ti -beam connection A Fig. 21 -Post-to-beam connection 12 • DECK DESIGN 4WIIDE V Footings See Table 1 for footing size and footing thickness and Figure 22 for post attachment requirements. The bottom of footings must extend 18 inches below grade and must bear on solid, native soil. Bearing conditions must be verified in the field Simpson PB anchor during the footing inspection, prior to placement or equivalent of concrete. Footings closer than 3'-0"to the existing exterior house wall must bear at the same pre-manufactured elevation as the existing wall footing. Do not Cast-In-place construct footings over utility lines or enclosed no post anchor meters. Call 1-800-332-2344 before you dig. X I • 4 • • Post Anchors: Premanufactured post anchors shall 6" min 114 a be capable of supporting a minimum of 3,000 4 ;l _ i I—� pounds. Where diagonal bracing is required by _111=111=111=7 a. • a .-a I_) I=III-III- Figure 15, the post anchors must be rated for 111=-111=-111=-1 I I • • ` III=III=III=III: horizontal (seismic) forces. —I I I-I 11_---1111--1 as •I 1=1 1 1=1 1 1=1 11= A Fig, 22: Typical footing detail Guardrails Decks and stairways more than 30 inches above the adjacent grade must have guardrails. The guardrail must be designed to withstand a concentrated load of 200 pounds, in any direction anywhere along its length, and the infill area must withstand a load of 50 pounds per square foot area. Guardrails using aluminum, composite wood, plastic, or other pre-manufactured systems must be designed by a structural engineer licensed in the state of Oregon. 4X4 post, typical, 2X2 picket, typical do not notch 1--4'-0" max spacing-A 2X6 or 5/4 board rail cap 1 r"." _ _ .J ._ _ IIIT2X4attoP / _ o 1 / M \ _C = = _ 1 _ _ _ _ . . ■ . r • II t • O See guard post _Openings shall not _Attach pickets at top and attachment details allow the passage bottom with (2)#8 screws or of a 4"dia. sphere (2)8d spiral shank nails each A/4ig. 23: Typical guardrail detail DECK DESIGN GUIDE • 13 2X6 top railing connect to ._ .. 1 2X2 picket at 51/2" O.C. max. post with (2)#10X3"screws attach pickets at top and bottom (may be flat or vertical) with (2)#8 wood screws or -4---- (2)spiral shank nails each I 2X4 bo om railing connect to _,. , 4X4 post post wit (2)#10X3 screws Decking __� ' e 4-- See guard post attachment options ` Figs. 25 - 32 i Deck fr.ming ` / 1 1 A Fig. 24: Guardr:%railing and picket detail ' Guardrail PostA ttachment Here are three optic s for guardrail post attachment; You may use one of these options or may submit a different design with drawings and Qalculations prepared by a professional engineer licensed in the State of Oregon. Guardrail posts shah be spaced per Figure 23 and attached per Figures 25 through 32. Note: 2x8 minimum joists are required for Figures 25, 26, 27, 30, and 31, and minimum 2x10 joists for Figures 28 and 29. You may use one of these options. I I i 1X4 posts (pickets and ._____,__ 11 Its not shown for clarity) I i' Simpson HD3B or equal holdown with (2)5/8" dia. galvanized through bolts with washers at far side ecking ls _. ii/_�// i/// %� /% ii FIRRI111111 11/2" 1..i.//►„111 (2) 5/8"dia. galvanized through A M IIII/bolts with washersif 1161111..6.-.A.ArAxrimg.' g 2X8 min. 2X8 rim joist with deck joists (3) 16d nails at each joist ®Fig. 25: Guardrail attachment OPTION 1 —Deck Joists perpendicular to guardrail, post onf outside,manufactured connectors fl I 14 • DECK DESIGN IDIDE i 4,(4 posts (pickets and______.•...1 ails not shown for clarity) Simpson HD3B or equal holdown with (2)5/8"dia. galvanized through bolts with washers Decking 1%��� .r' AN , �02 at far side alliiii►T7tl �,; 11/2",- � ��� �f� (2) 5/8" dia. galvanized ii)(r wJ! M; through bolts with washers Mill -6,.36,-.ArANINEt2X8 min. 2X8 min. rim joist with deck joists (3)#10x3"stainless steel screws at each joist A Fig. 26: Guardrail attachment OPTION 1A -Deck joists perpendicular to guardrail, rim joist on outside, manufactured connectors 4X4 posts (pickets and rails---_-4.. Simpson HD3B or equal holdown not shown for clarity) III with (2) 5/8"dia. galvanized through bolts with Decking washers at far side (2) 5/8" dia. galvanized ���„ �,�� ���� through bolts with washers 0 o tivi i 1 m 2X8 min.joist 2X blocking with Simpson A34 2X8 min. framing angle each side at deck joists each end (4 total) A Fig. 27: Guardrail attachment for OPTION 1 and 1A -Deck joists parallel to guardrail, post on outside, manufactured connectors DECK DESIGN GUIDE • 15 2X6 top railing connect __-_--_,,, 11111 2X2 picket at 51/2" O.C. max. to post with (2)#10X3" screws (may be flat attach pickets at top and or vertical) bottom with (2)#8 wood screws 1111 or(2)spiral shank nails each 2X4 bottom railing connect to post with r (2)#10X3"wood screws , . 4X4 post 4" max Mrdli ////.%////. 1" min. ••--midi. . ■ x.11/2„ 11 A In A 6" 2X10 min._.__. &ammo I 11. L6X3XI/4"X'-9" steel anglerjr1, 1 (2) 1/2" dia. galvanized with (2) 3/4" dia. through bolts through g bolts with oversized washers with (2)vertical short slot holes t____11/4" (11/2" dia. min.) AFig. 28: Guardrail attachment OPTION 2-Deck joists perpendicular to guardrail, post on outside, custom-fabricated connectors 2X10 joist or 2X10 blocking with Simpson A34 framing angle at each side at each end (4 total) \ 4x4 post I� (2) 3/4" dia. through bolts 2X10 rim joist L6X3X1/4"X'-9" steel angle with (2)3/4" dia. through bolts with (2) vertical short slot holes SECTION A-A AFig. 29: Guardrail attachment section for OPTION 2 16 • DECK DESIGN GUIDE ' 16"Min. yllr i.--DETAIL A (Figure 31) ' DTT2Z deck joist perpendicular to guardrail I ' = 4x4(min.)guardrail ' _ ( post at 48"o.c.(max.) \--------f---\--------f--- I I I I I I . 1 j 1/40 2x8(min.) `'WNW— blg ...........-2x8(min.) r .........r-gamfockrn mom .......—.....• deck joists DETAIL B I 1 (Figure 32) I DTT2Z __:). deck joist parallel to guardrail 2x8(mit,)rim joist-—/" 1 / beam � / below A Figure 30: Guardrail attachment OPTION 3 plan view Guardrail post Guardrail post Simpson DTT2Z (2)Simpson holdown or equal DTT2Z holdowns Decking or equal(one each 1/2"diameter 1/2"diameter side of blocking) machine bolts +wi �- " machine bolts or ducaded ,�2 fEts 'm,� ��+�,�����,��„�����, , 'orSn It Rim joist Deck joist I Blocking I (2x8 min) I (2x8 min) i Deck joist(2x8 min) 1 16”Min. I X Detail A Detail B A Fig. 31: Guardrail attachment OPTION 3 A Fig. 32: Guardrail attachment OPTION 3 perpendicular to guardrail parallel to guardrail DECK DESIGN GUIDE • 17 V Stairs Stai ways, stringers, handrails and guardrails shall meet the requirements shown in Figures 33 9" min. tread width Risers may be open but throjugh 36. All stringers shall be shall not deviate minimum 2x12. A level landing from one another shall not allow the passage of a 4" minimum 3 feet by 3 feet is required by more than 3/8" sphere at the top (usually this is the deck) ,�� and at the bottom of the stairway gi (usually a concrete pad, or the ground). �"�� Note: This stair detail is for a three Risers: 1X material min. foot!wide maximum stairway with 8" max. riser height, minimum 2x tread material. Plastic shall not deviate • irm..... or composite decking products may from one another ' /4" to 11/2" nosing be used for stair treads; however, by more than 3/8" I shall not deviate they may require additional stair stringers for bracing. Check with the from one another manufacturer's requirements. by more than 3/8" SeelBrochure#8 for additional stair' information. ®Fig• 33: Tread and riser detail Attach 2X tread material to stringers or cleats with (2)#8 screws or (2) 8d nails per board at each stringer or cleat 2X tread material Stringer N �I q i 2X4 cleat each side full deof tread: Stringers4Attach pth with (4)10d nails or#8 • wood screws i • • • • IIS//LI • • • • 5" min.Iiw�rrii • • • • • Max. span = 8'-0" with (2) stringers Max. span = 15'-6" Max. span = 10'-3" with (3) stringers Cut Stringer Solid Stringer ®Figs 34:Stair stringers and tread connections 18 DECK DESIGN GUIDE s 5'-0" max. between posts Stair guardrail required for stairs with a total rise / of 30" or more. See typical guardrail details / / for more information111047 Tri �� � o Stair guardrail height 34" min. measured from nosing of tread ; Triangular opening shall not permit the passage of a 6"dia. sphere AFig. 35:Stair guard requirements MIME Sloped hanger `�C ! or LS50 or approved anyarm, equal each side Band board or outside joist AFig. 36:Stair stringer connection detail Stair Handrails Stairs with four or more risers must have a handrail on at least one side. Handrails shall be graspable and shall be of decay-resistant and/or corrosion-resistant material. See Figure 37. The hand grip portion, if circular, shall be between 1%"and 2" in cross section. Shapes other than /...._31/2" max. circular shall have a perimeter dimension between 4" and 11/2" min. not greater than 6%" with a maximum cross sectional Handrail dimension of 2%". All shapes must have a smooth surface with no sharp corners. Handrails shall run continuously „,r from a point directly above the lowest riser to a point 11110.- 11 • directly above the highest riser and shall return to the guard at each end. See Figure 38. Handrails may be 1 resistant Corrosion interrupted at guardrail posts only at a turn in the stair. hand a it handrail hardware AFig. 37:Handrail requirements DECK DESIGN GUIDE • 19 • 3'-0"from deck surface to top of guardrail .../.01. _ _ _ = _ 1,. IF I , , Handrail shall return 4X4 post, typical at each end do not notch, NHandrailembedded i height 34"- 38" concrete _' 36" max. span from nosing of tread between stringers , ,x..._12"X12"X24" d' footing4 , 1 • AFig. 38:Miscellaneous stair requirements Framing at a Chimney or Bay Window Decks abutting a chimney or bay window shall be framed in accordance with Figure 39. Headers with a span length greater than 6'-0" require a calculation. / extend 6" max Decking may 6'-0" max Ledger boardI' I' Double joist Chimney or bay 0111 each side �'�'� Double li• header (2) 1/2"dia Double joist through bolt hanger typical or lag screws at ledger Plan Section AFig. 39:Requirements for framing at chimney or bay window 20 • DECK DESIGN GUIDE DECK FRAMING PLAN , 2X Decking attach Simpson LUS26 Fi Stairs per_ per general notes Figs. 33 - 38 min. hanger or Ledger connection approved equal choose from / "/ ,i .- --/ / /,/ / / - .4 oilFigIlia. 5, 6, 7, or 8 2X ledger board '' ►. A joists 2x I(; ato.c. m (n' viiiminisimiasigmor� 1• B beam I ,_ - ----- -- __ 111 nill I IF "D"footing i5 W x iq) W x aft ir • f- or x -n i """""'��.....■......,�..,...■*�...�Aiiir 1 dia. deep nam iiimmiI cp concrete min. strength: 2,500 psi Post spacing or beam span ig. H 1 Ft410. Fig. 9 or 2 Fig. Guardrail post connection Notes: Choose from 1.See general notes for additional information Beam span Fig. 25 26 27 2.See Figure 15 for diagonal bracing requirements 28, 29 or 30 s 3.See Figures 20,21 for post to beam connection and figure 18 for rim joist connection '` 4.See Figure 23 for typical guardrail elevation 1 <<s iroes , 4 , ,_ . - ' - Deck Design Guide -,, 0 ,,, Fl. . One and Two Family Residential Dwellings The Bureau of Development Services (BDS) is providing this CONTENTS information to help you design your deck, obtain a building permit and pass inspections. The standards and details in this Guide will Do I Need A Permit? 2 help you determine how large the footings, beams, joists, posts, and ledgers need to be; how to build lateral bracing, stairs, and railings; What Plans Do I Need? 2 r ; and how to fasten all of the pieces together. This Guide does not General Notes 3 : r take into account conditions which may affect your deck design such as drainage conditions, slope conditions, or decks supportingloads Footings,Beams,Joists,and Posts 4 `d in excess of the standard uniform loads. Depending on your specific LIS 0 situation, you may need to hire a licensed architect or structural The Ledger Board 7 vii al engineer prior to approval. �- Freestanding Decks 11 O F-- You may include all, or part of the pre-approved design standards and details in this guide with your building permit plans for decks that are: Lateral Support of Decks 11 Lia ,c • For one- and two-familydwellings 9 Framing Connections 12 •` CI- o • Single-span Footings 13 O °- • • All on one level Guardrails 13 ua - Not supporting a hot tub or spa > Stairs 18 .' __ • Not attached to house overhangs, bay windows, brick, stone or cz o concrete block Chimneys/Bay Windows 20 _ ^ - Not more than 10 feet above the ground Deck Framing Plan 21 0 r - Not bearing on ground with a slope greater than 2 feet horizontal Helpful Information 22 for every 1 foot vertical € Q M / uo a CC ;' Guard 111 m o ._ • 1fl1I Ledger board r-.. g rn W Rim joist ,,- 1 Y1 r (B �� 1 t I `a�I rn i \�\ Ledger board Qa Footing \ ,' attachment 1-- Grade � ,/ CC v � t \/' th:0 Joist I I 444% 4414,444,11. l 1U.. ' Post to beam . d" - connection 0 , Built-up beam v 1\/ I DECK DESIGN GUIDE • 1 Introduction Do I Need A Permit For My Deck? A building permit is required for all decks that are more than 30 inches above the ground at any point. See Brochure 3,Fences,Decks and Outdoor Projects. Setbacks and Other Regulations? For information on setbacks (how close a deck is to a property line) and other regulations that may apply to your deck project, even when a building permit is not required, see Brochure 3. Call Planning and Zoning at 503-823-7526 to find out what zoning requirements apply to your specific property. How Do I Get A Building Permit? k See BDS handout, Brochure 1, Guide to Permits and Inspections. This handout describes the building permit process from application to final inspection. '`; What Plans Do I Need? You may draw all your own plans and details without using this Guide, or you may use the pre-approved standards and details in this Guide to supplement your plans. Refer to Brochure 6, What Plans Do I Need for a Building Permit? for descriptions and examples of the plans needed to obtain a building permit for a typical residential construction project. Since a deck can be a relatively simple project, you will only be required to provide the plans listed below if you use this Guide: h �: - Site Plan-You will need to draw a site plan. The Site Plan must show the property lines, outlines of all existing and proposed buildings, paved areas and decks on the lot, and the distances from your proposed deck to the q e�q � nearest property lines. See Brochure 6 for Site Plan repuirements and a 4,K0 1& sample Site Plan. 44 f - Elevation View- You will also need to draw an Elevation View, which is a ` ®) , front or side view of your house and the proposed deck and the level of the x ground adjacent to the deck (see Brochure 6). - Framing and Foundation Plan- You can draw your own Framing and Foundation Plans (see Brochure 6) or you can complete the Worksheet and Typical Deck Plan at the end of this Guide. - Cross Section and Details- You can draw your own Cross Section and t ,' Details (see Brochure 6) or you can use the details in this Guide. Your plans must include details of the following parts of your deck: • Ledger board attachment • Joist-to-beam connection • Rim joist connection eljoi • Post-to-beam connection ( • Lateral support method . nor , R: • Guardrail height and openings � " ;` -i • Guardrail post attachment i • Stair and stair handrail details • Post-to-footing connection 2 • DECK DESIGN GUIDE 1 .. ,„a General Notes . 1.All lumber shall be grade #2 Douglas-Fir, Hem-Fir, or better and shall be ' ” '0 !I .,I ,. '� ;,. pressure treated (to resist insect and dry rot) in accordance with American 1fi iii 9 "< - Wood-Preservers' Association Standards (Category). Deck surface and trim material of redwood, cedar, or other wood with a natural resistance to iA; '' ; ��" decay does not require pressure treatment. The level of treatment depends on the use as follows: "tea a.Decking material, railings,joists, and beams must be treated to a Category — { „"e." 4 UC3B (or must be other wood with a natural resistance to decay). i ,' b.Posts and other woods located on, in, or in contact with the ground must �a ? J y be a Category UC4B. ' c.Any wood less than six inches above the ground or in contact with ' ` ..44',/,'"i*,'R,`.' .,,, _ ,-,,,,',,,-4:'':'-‘--• concrete must be a Category UC4A. The level of preservative treatment is noted on the tags on the ends of the wood members. Remember, any time you make a cut, treat the cut end of the wood with a paint-on preservative. Cut ends expose the inner untreated wood to potential moisture and insect damage. Hardwood and plastic or composite decking products may be substituted ° for conventional wood decking, but installation and span lengths of the t . substituted material must be in strict conformance with the product �1«, listing and the manufacturer's installation instructions. Copies of the manufacturer's installation instructions must be submitted with the building permit application. 2.All nails shall be common or box galvanized. It is recommended that common tlzi nails be used. They have a thicker shank and are stronger than box nails. '' a; : Z N$ 3.New pressure treatment methods use chemicals that will prematurely corrode standard fasteners, hardware, and flashing when in contact with pressure treated lumber; and as a result, fastener and hardware requirements have changed. Note the following: a.All screws and nails shall be hot-dipped galvanized or stainless steel. b.All hardware (bolts, nuts and washers, joist hangers, mechanical fasteners, holdowns, tie plates cast-in place post anchors, etc.) shall be i , galvanized with 1.85 oz/sf of zinc (G-185 coating) or shall be stainless ', ` ' steel. Look for products such as "Zmax" from Simpson Strong-Tie or ! 1 "Triple Zinc" from USP. � ,, ' 4.All decking material shall be 2x4, 2x6, or five quarter (5/4") boards. Attach i decking to each joist with two 10d nails or two #8 screws. Decking may be Isr 11;" ' ' ii 11111 eaplaced from an angle perpendicular to the joists to an angle of 45 degrees to E' 9 P p j 9 9 i ` a®• the joists. Decking must have a span length such that each board bears on a /,'i �'` minimum of two joists. '"" S.Headers over existing doors, windows or openings greater than six feet in width that are located below a deck that will be attached to the house must , , be checked to verify that those headers can support the additional load .. r it;'.. added by the deck. 6.The bottom of all footings for decks that are attached to a house are to be placed a minimum of 18 inches below the surface of the finished grade and must bear on firm, undisturbed native soil. The bottom of footings for free-standing decks may be at any depth on undisturbed native soil. Footings adjacent to the top of a retaining wall must be set back from the wall a distance equal to the height of the wall, or be extend below grade an amount equal to the height of the retaining wall. DECK DESIGN GUIDE • 3 Footings, Beams, Joists, and Posts'` First, decide how long and wide you want your deck. (Note: The drawings in this Guide indicate square or rectangular configurations, however, decks can be any shape as long as the longest joist and beam spans are used to determine the beam,joist, and footing sizes.) Your deck can have up to a two-foot maximum joist and/or beam overhang. See Figures 1, 2, and 3. Beams must be supported on each end by a post and cannot be supported with beam hangers off the house. Use Table 1 to find the minimum beam, joist and footing sizes. Joists are identified as "A", beams as "B", posts as "C," and footings as "D." It is recommended that you first determine the joist span, and then note what beam and footing sizes you will need. Optional overhang The span of a joist is measured — r from the centerline of bearing at one end of the joist to the L centerline of bearing at the other and does not include overhangs. � � Blocking Maximum joist span lengths are noted in Table 1. See Figures 1 and 2 for joist Beam "B" Joist "A" span types. Post"C" - - Footing "D" 2'-0" max. Joist span /--- overhang ir (Min. span = 6'-0"with overhang) AFig. Joist span, deck attached at house .17 Optional overhang 1 -�--- Blocking B '\A 1) C 2'-O" max. Joist span 2'-0" max. overhang (Min. span = 6'-0"with overhang) AFig. 2:Joist span, freestanding deck 4 • DECK DESIGN GUIDE Optional overhang B NI\A Beam splices at interior post -• C locations only / D :-6" min / - - - - 2'-0" max. / Beam span / Beam span / overhang (Min. span = 6'-0"with overhang) AFig. 3:Beam span Table 1 provides you with the information to determine the minimum sizes of the footings, beams, and joists. The sizes will depend on how big the deck will be and how many footings and posts are going to be used; how far the beam(s) will span from post to post, or post to ledger; and how far the joist will span from beam to beam, or beam to ledger. Note: The sizes, spans and spacing of the joists in Table 1 are the minimum/maximum allowed by code. If you want your deck to be stiffer, increase the size, reduce the span, or reduce the spacing of your joists. Note: The footings must bear on native soil. The footing details require a footing that is a minimum of 24 inches in height so the bottom can be located a minimum of 18 inches below the finished grade and extend six inches above the finished grade. If you have fill material that is greater than 18 inches deep, your footing will need to extend through the fill to native soil. Footings for freestanding decks (those not attached to the house) are not required to be located 18 inches below the finished grade and can have a minimum thickness of eight inches. Post sizes are 4x4 minimum for decks six feet or less above the ground and 4x6 for decks over six feet above the ground. Use a minimum 4x6 post under all beam splices. Mark the sizes, spacing and spans for the footings, beams, joists, and posts from Table 1 in the space provided below: A. Joist Size: i . x d , spaced apart. B. Beam Size: Li x . C. Post Size: q x L , spaced7� aapart. D. Footing Size: US x ( 8 x . Transfer your footings, beams, joists, and posts information above into the Deck Framing Plan at the end of this Guide DECK DESIGN GUIDE • 5 • TABLE 1 If you have a and you have then you and the and they can and the footings"D" beam"B"that is: posts"C" can only minimum size be spaced a supporting the posts supporting the span the joist you can maximum of: must be a minimum size beam spaced: joists: use is: of (WxWxH): 4x8 or (2) 2x8 6'-0" apart 6'-0" 2x6* 24" apart 13"x13"x24" deep or 14" diameter x 24" deep 4x10 or (2) 2x10 8'-6" apart 6'-0" 2x6* 24" apart 15x15"x24" or 17"diameter x 24"deep 4x12 or (2) 2x12 10'-6" apart 6'-0" 2x6* 24" apart 16"x16"x24"or 18" diameter x 24" deep 4x12 11'-9" apart 6'-O" 24"apart 18"x18"x24" or 20" diameter x 24" deep 4x8 or (2) 2x8 6'-0" apart 8'-0" 16" apart or 24" 14x14"x24" or apart 16" diameter x 24" deep 4x10 or (2) 2x10 8'-0" apart 8'-0" • or 2x8 16" apart or 24" 16"x16"x24" or apart 18" diameter x 24" deep 4x12 or (2) 2x12 9'-6" apart 8'-0" • or 2x8 16" apart or 24" 18"x18"x24" or apart 20" diameter x 24" deep 4x12 10'-9" apart 8'-0" • or 2x8 16" apart or 24" 18"x18"x24" or apart 20" diameter x 24"deep 4x8 or (2) 2x8 5'-6" apart 10'-0" 2x8 or 2x10 16" apart or 24" 14"x14"x24" or apart 16" diameter x 24" deep 4x10 or (2) 2x10 7'-6" apart 10'-0" 2x8 or 2x10 16" apart or 24" 16"x16"x24" or apart 18" diameter x 24" deep 4x12 or (2) 2x12 9'-0" apart 10'-0" 2x8 or 2x10 16" apart or 24" 18"x18"x24" or apart 20" diameter x 24" deep 4x12 10'-3" apart 10'-0" 2x8 or 2x10 16" apart or 24" 20"x20"x24" or apart 23" diameter x 24" deep 4x6 or (2) 2x8 5'-0" 12'-0" 2x10 or 2x12 16" apart or 24" 14"x14"x24" or apart 16" diameter x 24" deep 4x8 or (2) 2x10 6'-6" 12'-0" 2x10 or 2x12 16" apart or 24" 16"x16"x24" or apart 18" diameter x 24"deep 4x12 or (2) 2x12 8'-6" 12'-0" 2x10 or 2x12 16" apart or 24" 18"x18"x24" or apart 20" diameter x 24" deep 4x12 9'-6" 12'-0" 2x10 or 2x12 16" apart or 24" 20"x20"x24" or apart 22" diameter x 24" deep 4x6 or (2) 2x8 4'-6" 16'-0" 2x12 16" apart 15"x15"x24" or 17"diameter x 24" deep 4x8 or (2) 2x10 6'-0" 16'-0" 2X12 16" apart 18"x18"x24" or 20" diameter x 24 deep 4x10 or (2) 2x12 7'-6" 16'-0" 2X12 16" apart 20"x20"x24" or 23" diameter x 24" deep 4x12 9'-0" 16'-0" 2x12 16" apart 22"x22"x24" or 25" diameter x 24" deep * 2x6 joists cannot be used where a guardrail is required. 6 • DECK DESIGN GUIDE The Ledger Board Decks that are attached to a house require a ledger board to be fastened to the house structure, and the deck joists are fastened to the ledger. If your deck will be free-standing and not attached to the house, skip this section and proceed to Free-Standing Decks. There are several methods for attaching the ledger to the house, depending on how the house was built and how high the deck will be located relative to the house's existing floor framing. The ledger can be fastened to the house band board (or rim joist) (Figure 5 or 6), the wall studs (Figure 7) or a concrete wall (Figure 8). You will need to verify the existing conditions before you apply for a building permit. If you can't verify the existing conditions or if they are different from Figures 5, 6, 7 or 8 then a free-standing deck is required (see Free-Standing Decks). Siding and Flashings:The siding or exterior finish system must be removed to install the ledger board against the wall sheathing. Two layers of continuous flashing must be properly installed to prevent water from getting into the wall where the siding has been removed. See Figure 5. The flashing material may be copper (using copper nails), stainless steel, galvanized steel coated with 1.85 oz/sf of zinc (G-185 coating), UV-resistant plastic, or self-sealing bituminous (tar) "peel- and-stick" flashing. The first layer is attached directly to the exterior wall sheathing starting behind and above the bottom edge of the building paper and siding, continuing straight down the face of the wall behind the ledger board (before it is 1/ i I installed) and ending on the First layer flashing behind building outer face of the exterior wall Exterior wall sheathing . and ledger board, and over siding siding or foundation below the (15/32" max sheathing) bottom of the ledger board. Second layer"Z" flashing over top Self-sealing bituminous peel- Existing wall , and down face of ledger board and-stick flashing is ideal for �r , the first layer. Pre-formed V' Ai,r AI Decking over Z-shaped metal flashing is ideal Existing 2X ,. i deck joist for the outer, second layer of rim (band) l , flashing. It is installed after • 2X ledger, same size the ledger board and before 2X floor joist.. ' V as deck joist the joists, starting behind and it above the bottom edge of Joist hanger LUS26 the building paper and siding, (or equal) min. continuing down vertically to Existing wall framing 1 ,, 1/2" lag screws or the top of the ledger board, bending horizontally to the or concrete wall ( l/4"X41/2" Simpson SDS screws outer face of the ledger board, (shown dashed) I (or equal) staggered from top to bottom and bending again vertically it and spaced at spacing "S" down the face of the ledger board at least 1/2". AFig. 5:Attachment of Ledger Board to Band Board with Lag or Wood Screws (See Fig. 12 for spacing and clearances) Spacing"S" .M4°., Joist Span 1/2"dia.lag screws*! Simpson SDS 1/4"X 41/2" 0 < span < 8' 23" 14" 8' < span< 10' 18" 12" X 10' < span< 14' 13" 8" 14' < span < 16' 11" 6" *The tip of lag screw shall fully extend beyond inside face of rim joist!From table R502.2.2.1 of 2011 ORSC. , -4,1 Manufactured Wood Joists(MWJs): If the existing house floor joists are MWJs, and not /4 solid-sawn lumber, you will need to submit a ledger attachment detail that is approved by the MWJ manufacturer or a licensed engineer. Examples of MJWs are TJI, GPI and A Fig. 4:MWJ profile LPI. See Figure 4. Older homes constructed with MWJs may have a plywood band board, while some newer homes may have 1 1/4-inch manufactured wood rim joists. DECK DESIGN GUIDE • 7 Exterior sheathing Continuous flashing (15/32" max) (See Fig. 5) Existing wall ► Existing 2X rim (band) Decking over I- deck joist 1 / it r., I(r�_ _mato Spacing Joist Span „S„ 2X floor joist/ I I o < span < 8' 36" I 2X ledger with 1/2" dia. bolts 8' < span < 10' 34" staggered at spacing"S". Existing wall framing Locate first bolt 2"from end 10' < span< 14' 24" or concrete wall-...1 of ledger 14' < span < 16' 21" (shown dashed) From table R502.2.2.1 of 2011 ORSC. I AFig. 6:Attachment of Ledger Board to Band Board with Thru-Bolts (See Fig. 12 for spacing and clearances) Exterior sheathing . Remove siding at ledger min. thickness = 3/8" i location prior to installation Continuous flashing (See Fig. 5) Existing wall stud . /A'MAFM'/////A V .44 % AV/ .4 um IVI• 1" min. Irg rat 16" O.C. Fasteners 11 per table I 2X ledger Required fasteners to each stud I\ Joist Span or(16 inches o.c.max.) ( Joist span----0.. 1/4'1X 41/2" #10.5"Wood Simpson SOS Screws Screws 0 < span<8' 2 3 I -1r- 8' < span < 10' 2 4 10' < span < 14' 2 5 A Fig. 7:Attachment of Ledger Board to Wall Studs with Screws 14' < span< 16' 2 6 8 • DECK DESIGN GUIDE Concrete wall Decking over /deck joist A_ 171 . 2" min. a Spacing 2X ledger with 1/2" dia. Joist Span „S„ expansion anchors o < span <8' 18" staggered at spacing 8' < span < 10' 15" "S" with minimum 21/2" 10' < span < 14' 10" embedment 14' < span < 16' 9" .Fig. 8:Attachment of Ledger Board to Concrete Wall (See Fig. 12 for spacing and clearances) Prohibited Ledger Attachments:Attachments to the ends of premanufactured open web joists, to brick veneers, and to house overhang/bay windows are not allowed when using this Guide (see Figures 9, 10 and 11). In such cases the decks shall be free-standing (see Free-Standing Decks). P I i floor joists �I __ II'lllil l`lllil1 r' liMai _ deck ti ',DistWA _�l �� IIS 40, brick o • i 1E1 4. ����� ma eer 'e Fig. 9:No attachment Fig. 10:No attachment Fig. 11:No attachment to open web trusses to brick veneer to house overhang 2"to 5" max from end / 0 0 2" Staggered fasteners_ f - - -o o top to 2" bottom Spacing "S"/ AFig. 12:Ledger Board Fastener Spacing and Clearances DECK DESIGN GUIDE • 9 • • Ledger Board Fasteners All fasteners shall be spaced per the tables provided with Figures 5, 6, 7 and 8 and shall be installed per Figure 12. All fasteners shall be installed with washers and thoroughly tightened. Thru-bolts:Thru-bolts are those where a hole is drilled all the way through the wood members and a nut and washer are attached to complete the connection. Thru-bolts shall have a minimum diameter of 1/2". Lead (pilot) holes for thru-bolts shall be 17/32"to 9/16" in diameter. Thru-bolts must be equipped with washers at the bolt head as well as the nut. Expansion(Wedge)Anchors: Use expansion anchors when attaching a ledger board to a concrete wall as shown in Figure 8. Bolt diameters of the anchors shall be a minimum of %2"; in some cases, this may require an anchor size of 5/8". Minimum embedment length shall be 21/2". Expansion anchors must have washers. Expansion anchors must be installed as required by the manufacturer's instructions. This may include cleaning the holes drilled in the concrete to ensure they are free of dirt, debris, and moisture. Improper installation of the anchors can result in catastrophic failure and collapse of the deck. Adhesive Anchors: Adhesive anchors may be used with a design by a licensed structural engineer. Special inspections are required for expansion anchors and adhesive anchors. They are performed by third-party inspectors that are hired by the project owner. The special inspector verifies that the expansion or adhesive fasteners are installed correctly and submits a report to the owner and the City. Lag Screws: Lag screws shall have a diameter of 1/2" and shall be hot-dipped galvanized or stainless steel. Lag screws may be used only when the field conditions match those shown in Figure 5. See Figure 13 for lag screw length and shank requirements. All lag screws shall be installed with washers. Lag screws must be hot dipped galvanized or stainless steel only 1/2"dia. \%\l\ \I\l\l\l\%\%\I\I\1\ \%\',� Screw must penetrate beyond and board/rim joist a minimum of 1/2" 11/2" shank Length must extend through • (no threads) existing band board/rim joist ~' AFig 13:Lag screw requirements Lag Screw Installation Requirements: Each lag screw shall have lead (pilot) holes drilled as follows: 1) drill a 1/2" diameter hole in the ledger board, 2) drill a 5/16" diameter hole into the solid connection material of the existing house. DO NOT DRILL A 1/2" DIAMETER HOLE INTO THE SOLID CONNECTION MATERIAL. The threaded portion of the lag screw shall be inserted into the lead hole by turning. DO NOT DRIVE WITH A HAMMER. Use soap or a wood-compatible lubricant as required to help facilitate tightening. Each lag screw shall be thoroughly tightened. Simpson SOS Screws or Equivalent: Install per manufacturer's instructions. Mark the size of the ledger board and the fastener type, size, and spacing in the spaces below: Ledger Size: . x IQ , fastened with st NA-eS1&J SDS 4 X.'1Y8-" , spaced Lel apart. Transfer your ledger, information above into the Typical Deck Plan at the end of this Guide. 10 • DECK DESIGN GUIDE Freestanding Decks Decks that are free-standing do not utilize the exterior wall of the Rim joist existing house to support vertical or lateral loads. Freestanding decks allow the exterior siding to remain on the house, so there is less opportunity for water to get into the wall st-ucture. �---- II� Freestanding decks may use precast ,/ / footing pads set 12" below the surface �' 4* f Joist of the ground on firm, undisturbed ,// "" overhang native soil. Rim &� joist1 0 ,. Freestanding decks require in additional ' Joist beam, posts and footings, i stead of a Grade `_ \_�01\11 ledger board attached to the house. . �t i `► t .Fig. 14:Freestanding deck 1 11110 Lateral Support Decks more than 3Q inches :bove grade must resist lateral forces (wind and earthquake) with diagonal cross bracing as shown in Figure 15J Bracing shall be located between posts parallel to beams and bolted with a 3/8" diameter through- bolt at each end to the post. as shown. Diagonal bracing shall also be located perpendicular to beams. Bracing is required in every other bay between posts for decks with joist spans up to 8 feet, and in every bay for decks with joist spans greater than 8 feet. If the deck is free-standing, diagonal bracing must be provided on all the posts and in both directions. J _4 J L. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 1 i i - - - _, 1 I— l. i. uii . . uiI_ ii. . iuui _I ' • , . . . . : 1 A A � � �• _ A 17 (1)3/8"dia.throug bolt • • / at each ccnnectio 2X6 cross brace . -...,,,,, , • • X co E b • • • f _Solid block at intersection of wood Bracing required every bay for deck with joist spans>8' braceis with(1)3/8"dia.through bolt(typ) Bracing required alternate bays with joist spans_<8' A Fig.15:Diagonal bracing DECK DESIGN GUIDE • 11 Framing Connections Mechanical fasteners may be Joist Hangers: Joist hangers installed in lieu of toe-nails (see Fig. 16) shall I►aye a (3)8d toe minimum capacity bf 1,000 nailed pounds. Joist hangers used, fi •-- Joists ----0- shall --►shall be manufactuhed for it their intended lumber size. 111.4 Joist-to-Beam Connection:' ir Each joist shall be attached I I to the beam as shown inIFig. 16 or 17. ii .Fig.16: Typical joist hangers ®Fig.17:Joist-to-beam detail Secure decking to top Rim Joists:Attach a continuous rim joist or rim joist with#10X3"min. wood screw at 6"O.C. to the ends of joists as shown in Figure Joists 18. Note that the rim joists are required at both ends of joists in free-standing decks. Minimum rim joist dimensions shall be equal to the dimensions of 1 the joist. 'IIBuilt-up Beams: Built-up beams shall be de \ Attach rim joist to end of each assembled in accordance with Figure 19. ' joist with (5)#10X3"min. The nailing pattern shall be staggered wood screws as shown. Post-To-Beam Connection:The post- Rim joist to-beam connection shall be made with premanufactured mechanical connectors A Fig. 18:Rim foil as shown in Figure 20. Post-to-beam t connection connections may also be accomplished 11 10d nail or#10 (2)fasteners, using a minimum 6x6 post notched for a each end 4x beam as shown in Figure 21. All thru- wood screw, typ \ bolts shall have washers at the bolt head and nut. WMMNMIIIIIIrt------------------H NO typ• typ- A Fig. 19:Built-u -beam 2" min. (2) 1/2" dia. through —"�-•-f _ „ _ bolt and washers Post to beam (2)2X beam ,', If (2) 4X beam .pI �^ connector (2)2X beam . I,II I ' or 4X beam .,._,�.—._ 11/2" min. Notch post to accommodate beam 4X4 min. 6X6 min. IN AFig. 20-Post-to-beam connection A Fig. 21 -Post-to-beam connection 12 • DECK DESIGN GUIDE • Footings see Table 1 for footing size and footing thickness and Figure 22 for post attachment requirements. The bottom of footings must extend 18 inches below grade and must bear on solid, native soil. Bearing conditions must be verified in the field Simpson PB anchor during the footing inspection, prior to placement or equivalent of concrete. Footings closer than 3'-0" to the pre-manufactured existing exterior house wall must bear at the same cast-in-place elevation as the existing wall footing. Do not no post anchor construct footings over utility lines or enclosed y meters. call 1-800-332-2344 before you dig. 'I . •• " I. 4 • 6" min ;; ° • Post Anchors: Premanufactured post anchors shall • 4• ;; , 11=11 I be capable of supporting a minimum of 3,000 --mi _ _ _ ° ' a ...4'�. I I^III—III—III= pounds. Where diagonal bracing is required byII—III—III—I • • III=III=III=III. Figure 15, the post anchors must be rated for :111=111=111=111 • ° horizontal (seismic) forces. —III,-III-III--I ; �, I I-III-I I (-III-- • A Fig. 22: Typical footing detail Guardrails Decks and stairways more than 30 inches above the adjacent grade must have guardrails. The guardrail must be designed to withstand a concentrated load of 200 pounds, in any direction anywhere along its length, and the infill area must withstand a load of 50 pounds per square foot area. Guardrails using aluminum, composite wood, plastic, or other pre-manufactured systems must be designed by a structural engineer licensed in the state of Oregon. 4X4 post, typical, 2X2 picket, typical do not notch 74-4'-0" max spacing-/- 2X6 or 5/4 board rail cap IlT2X4attoP _ ___ _ _1 _ _ _ _ _ _ / M \'' _..c = = pir _ 1 = _ _ _ . 1. . . . • • / • e See guard post —Openings shall not Attach pickets at top and attachment details allow the passage bottom with (2)#8 screws or of a 4" dia. sphere (2) 8d spiral shank nails each A Eig. 23: Typical guardrail detail DECK DESIGN GUIDE • 13 1 2X6 top railing connect to 2X2 picket at 51/2" O.C. max. post wit (2)#10X3"screws attach pickets at top and bottom (may be flat or vertical) with (2)#8 wood screws or —11,-- (2)spiral shank nails each 2X4 bo om railing connect to_•- A 4X4 post post wit (2)#10X3" screws Decking _. /// ,ill//// -.--1 1111111, See guard post attachment options / Figs. 25 - 32 Deck fr.ming 1 A Fig, 24: Guardr.7 railing and picket detail Guardrail Post Attachment Here are three optk s for guardrail post attachment; You may use one of these options or may submit a different design with drawings and i alculations prepared by a professional engineer licensed in the State of Oregon. Guardrail posts shal be spaced per Figure 23 and attached per Figures 25 through 32. Note: 2x8 minimum joists are required for Figures 25, 26, 27, 30, and 31, and minimum 2x10 joists for Figures 28 and 29. You may use one of these options. X4 posts (pickets and i!.ils not shown for clarity) Simpson HD3B or equal holdown with (2)5/8" dia. galvanized through bolts with washers at far side Decking_..raw '//// op- A Akin]01 (2)5/8" dia. galvanized through 11/2 4. w M !wow 1111 bolts with washers 0X8 min. 2X8 rim joist with neck joists (3) 16d nails at each joist AFig. 25: Guard4l attachment OPTION 1 —Deck joists perpendicular to guardrail, post onj outside,manufactured connectors 14 • DECK DESIGN VIDE 4X4 posts (pickets ander_ ails not shown for clarity) Simpson HD3B or equal holdown with (2) 5/8" dia. galvanized through bolts with washers Deckin , at far side � „ � u ��;i j�'>through ( ) 5/s" dia. galvanized 1 /2 �� bolts with washers 2X8 min. 2X8 min. rim joist with dick joists (3)#10x3" stainless steel screws at each joist \t .AF,gt8hlattam0nt OPT/ON 1A -Deck joists perpendicu/ai to guardrai/, rim joist on outside, manufactured connectors 4X4 posts (pickets and rails--► Simpson HD3B or equal holdown not shown for clarity) with (2) 5/s" dia. galvanized through bolts with washers at far side Decking (2) 5/8" dia. galvanized Al through bolts with washers Aly 0 • C 7 A 2X8 min.joist 1L, at AN-I 2X blocking with Simpson A34 2X8 min. framing angle each side at deck joists each end (4 total) A Fig. 27: Guardrail attachment for OPTION 1 and 1A -Deck joists parallel to guardrail, post on outside, manufactured connectors DECK DESIGN GUIDE • 15 2X6 top railing connect ro 2X2 picket at 51/2" O.C. max. post ost with (2)#10X3" attach pickets at top and screws (may be flat bottom with (2)#8 wood screws or vertical) III or (2)spiral shank nails each 2X4 bottom railing Er connect to post with (2)#10X3"wood screws ig `� _____._4X4 post 4" max % 1" min. MI - ` 2X10 min. ... in pi! �I A 6" L6X3X1/4"X0'-9" steel angle I (2) 1/2" dia. galvanized through with (2) 3/4" dia. through bolts bolts with oversized washers L_._ with (2)vertical short slot holes 11/4" (11/2" dia. min.) AFig. 28: Guardrail attachment OPTION 2-Deck joists perpendicular to guardrail, post on outside, custom-fabricated connectors 2X10 joist or 2X10 blocking with Simpson A34 framing angle at each side at each end (4 total) i., /4X4 post (2) 3/4" dia. through bolts �--2X10 rim joist L6X3X1/4"X0'-9" steel angle with (2)3/4" dia. through bolts with (2)vertical short slot holes SECTION A-A AFig. 29: Guardrail attachment section for OPTION 2 16 • DECK DESIGN GUIDE 16"Min. y 'I DETAIL A (Figure 31) 1 r j_ DTT2Z deck joist perpendicular to guardrail I ( ••� ,„ L.--4x4(min.)guardrail ' f post at 48"o.c.(max.) I I 2x8( ) ��-2x8(min.) '" blocking .., L .__......_,...` deck joists DETAIL B ' I (Figure 32) am=moo To DTT2Z // deck joist parallel to guardrail 2x8(min.)rim joist beam \-- below ®Figure 30: Guardrail attachment OPTION 3 plan view Guardrail post Guardrail post Simpson DTT2Z (2)Simpson holdown or equal DTT2Z holdowns or equal(one each Decking side of blocking) „ la /2"diameter 1/2 diameter _ machine bolts -� -r11�11 machine bolts -�_` or threaded ir/_,,,y ,12. or threaded 's1" ' ,`„,,,�, rodwith nutsrod with nuts �� S 4 I li 1111/1 I li I!:;j' i;nir2'' Ri ... and washers and washers 14 *ilk dill llr ril Blocking I Rim joist /77 Deck joist I (2x8 min) I (2x8 min) Deck joist(2x8 min) I I X 16”Min. X Detail A Detail B A Fig. 31: Guardrail attachment OPTION 3 A Fig. 32: Guardrail attachment OPTION 3 perpendicular to guardrail parallel to guardrail DECK DESIGN GUIDE • 17 Stairs Stai'ways, stringers, handrails and guardrails shall meet the g" min. tread width Risers may be open but reqirements shown in Figures 33 thro igh 36. All stringers shall be shall not deviate shall not allow the passage minimum 2x12. A level landing from one another of a 4" sphere minimum 3 feet by 3 feet is required by more than 3/8" at tiie top (usually this is the deck) .i and'at the bottom of the stairway , fill (us ally a concrete pad, or the gro nd). Risers: 1X material min. Note: This stair detail is for a three 8.. max. riser height,. foot'I wide maximum stairway with minimum 2x tread material. Plastic shall not deviate • ' .....".' /4"to 11/2" nosing or composite decking products may from one another j shall not deviate be Used for stair treads; however, by more than 3/8" they may require additional stair from one another stringers for bracing. Check with the by more than 3/8" manufacturer's requirements. See Brochure# 8 for additional A Fig. 33: Tread and riser detail stai information. Attach 2X tread material to stringers or cleats with (2)#8 screws or (2) 8d nails per board at each stringer or cleat 2X tread material Stringer I� II II 2X4 cleat each side full depth of tread: Attach with (4)10d Stringers nails or#8 wood screws • • • ra0V • • irA • • • • 5" min. • • Max. span = 8'-0" with (2) stringers Max. span = 15'-6" Max. span = 10'-3" with (3) stringers Cut Stringer Solid Stringer ®Fig. 34:Stair stringers and tread connections 18 • DECK DESIGN GUIDE • 5'-0" max. between posts 1 Stair guardrail requiredIll for stairs with a total rise of 30" or more. See typical guardrail details /04411011 for more information 01.474., Stair guardrail._._._. -v- Arni height 34" min. measured from 1.1 nosing of tread z room, Triangular opening shall not permit the passage of a 6" dia. sphere Sloped hanger A Fig. 35: Stair guard requirements I/o/.am "II? � or LS50 or approved � �_ - equal each side IIAIIIPAIMIPI Band board or i outside joist I'AI"�" AFig. 36: Stair stringer connection detail Stair Handrails Stairs with four or more risers must have a handrail on at least one side. Handrails shall be graspable and shall be of decay-resistant and/or corrosion-resistant material. 31/2" max. See Figure 37. The hand grip portion, if circular, shall be /� between 1 Y4" and 2" in cross section. Shapes other than 11/2" min. -yt__rc. Handrail circular shall have a perimeter dimension between 4" and not greater than 6Y4" with a maximum cross sectional /ir dimension of 214". All shapes must have a smooth surface / with no sharp corners. Handrails shall run continuously l—�.� • from a point directly above the lowest riser to a pointCorrosion directly above the highest riser and shall return to the I/ resistant guard at each end. See Figure 38. Handrails may be handrail interrupted at guardrail posts only at a turn in the stair. hardware ®Fig. 37:Handrail requirements DECK DESIGN GUIDE • 19 ill l, • • ., from deck surface to top of guardrail MN UM V111113,_0" -. ■ ... liii- MN ir Handrail shall return at each end 4X4 post, typical do not notch, Handrail height 34" - 38" embedded i from nosing of tread concrete 36" max. span between stringers . •''_, _._12"X12"X24" . � .. footing 3j. . • q AFig. 38:Miscellaneous stair requirements Framing at a Chimney or Bay Window Decks abutting a chimney or bay window shall be framed in accordance with Figure 39. Headers with a span length greater than 6'-0" require a calculation. / / / // / / / / Decking may � ' , • ' / 1 , , � extend6" max ,y-/ Led4/ 6'-0" max f _baagd er 1 t -- / / /Chimney or bay BMDouble joist , / / / / / / each side , Double 1 - - - - header (2) 1/2"dia through bolt Double joist or lag screws hanger typical at ledger Plan Section ®Fig. 39:Requirements for framing at chimney or bay window 20 • DECK DESIGN GUIDE i DECK FRAMING PLAN 2X Decking attach Simpson LUS26 Ledger connection Stairs per per general notes min. hanger or © choose from Figs. 33 - 38 approved equal Fig. 5, 6, 7, or 8 N i \ 2X ledger board "A"joists 2x it) at ^-ro.c. �■-n0*6-i 11 l a tt "B"beam Lj x iO la hII C . " „C„post 4 x " (5zi) ✓ "D"footing i`v W x it W x a�L or xi i _ r I dia. deep X m 0 cr, i_ _j I_ I J concrete min. strength: o V n v( 2, 500 psi _ r 3 Post spacing or beam span igg• \C'L''/ 1 1 Ft (' In Fig. Guardrail post connection Fig. 1 or 2 3 Choose from Notes: Beam span Fig. 25, 26, 27, 1.See general notes for additional information 28, 29 or 30 = 2.See Figure 15 for diagonal bracing requirements 3.See Figures 20,21 for post to beam connection and figure 18 for rim joist connection 1" 4.See Figure 23 for typical guardrail elevation