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Permit Support Document (17) FOR OFFICE USE ONLY-SITE ADDRESS: This form is recognized by most building departments in the Tri-County area for transmitting information. Please complete this form when submitting information for plan review responses and revisions. This form and the information it provides helps the review process and response to your project. c \' City of Tigard • COMMUNITY DEVELOPMENT DEPARTME ECG- `�ED .1111 M Transmittal Letter 3t1N 14 "23 i } .,,,i i) 13125 SW Hall Blvd. • Tigard, Oregon 97223 • 503.718.2439 • www.tig OF IGARERING r Oki IPI�'I41 INE TO: DATE RECEIVED: DEPT: BUILDING DIVISION RECEIVED FROM: + /O� JUN 13 2023 COMPANY: (IQt,' Il/1/1,j a 1447)-ems CITY OF TIGARD �j� PLANNING/ENGINEERING PHONE: l l 1 - 70$- Sy L By: EMAIL: d ►olo GEC Ge 4/ A /�-'$ ✓ewet 1 i,341t_S, RE: OS---o - ' y4Sfi-202 3 0©obi (Site Addr " kc- (Project (Permit Number) name or subdivision name and lot number) ATTACHED ARE THE FOLLOWING ITEMS: Copies: Description: Copies: Description: Additional set(s) of plans. Revisions: Cross section(s) and details. Wall bracing and/or lateral analysis. Floor/roof framing. Basement and retaining walls. Beam calculations. Engineer's calculations. Other(explain): REMARKS: g-ZVl, SVC✓b l'i- tAa • a e-% -1 - FO OF ICE USE ONLY q� Routed to Permit Technic' : Date: Ca Ll/ Z3 Initials: ?/4 Fees Due: ❑ Yes No Fee Descri do : Amount Due: / .._\---0 J $ $ )07 Special Instructions: Reprint Permit(per PE): ❑ Yes EIZ ❑ Done Applicant Notified: Date: Initials: I:\Building\Forms\TransmittalLetter-Revisions_073120.doc BCD TECHNICAL BULLETIN June 2021 SLAB-ON-GRADE INSULATION FOR NEW DWELLINGS OREGON RESIDENTIAL SPECIALTY CODE (ORSC) 11)S OS Sfr4 k L-, Yv Si z3 - (iREVISION This document highlights the intent of the Oregon Residential Specialty Code(ORSC)when installing perimeter insulation to slab-on-grade floors and provides compliant construction detail examples. SECTION N1104.7-SLAB-ON-GRADE FLOORS OFFICE COPY Section N1104.7 of the ORSC requires that the perimeter of slab-on-grade floors shall be insulated. The • insulation shall extend downward from the top of the slab for a minimum of 24 inches or downward to the bottom of the slab, then horizontally beneath the slab for a minimum total distance of 24 inches. Table N 1101.1(1) specifies this requirement along with the minimum insulation value of R-15. There is an exception for monolithic slabs that allows for the insulation to extend downward from the top of the slab to the bottom of the thickened edge. Section N 1104.7.1 requires that slab-on-grade floors with hydronic heat insulate the entire underside of the slab to R-10 in addition to perimeter insulation. The perimeter insulation is allowed to be installed on the exterior of the slab or the interior(if not a monolithic slab). The minimum total distance of 24 inches may be a combination of the horizontal and vertical planes. If a horizonal plane is used on the exterior of the slab,it must be a minimun of 12 inches below finish grade. TABLE N1101.1(1) PRESCRIPTIVE ENVELOPE REQUIREMENTS' RECEIVFE) STANDARD BASE CASE LOG HOMES ONLY BUILDING COMPONENT Required Equiv.Value" Required ,�(f I ulAZg0 Performance Performance Wall insulation—above grade U-0.059` R-21 Intermediate` Note d L,1 i Y Ut4oijcpAAD �E Wall insulation—below grade` C-0.063 R-15 c.i./R-21 C-0.063 '1_.ANN1N`r7t=1571r"21'EERINC Flat ceilingsf U-0.021 R-49 U-0.020 R-49 Ah R-30 Rafter or Vaulted ceilingsg U-0.033 U-0.027 R-38Ah R-30A&h Scissor Truss Underfloors U-0.033 R-30 U-0.033 R-30 Slab-edge perimeter' F-0.520 R-15 F-0.520 R-15 Heated slab interior' n/a R-10 n/a R-10 Windows' U-0.27 U-0.27 U-0.27 U-0.27 Skylights U-0.50 U-0.50 U-0.50 U-0.50 Exterior doorsk U-0.20 U-0.20 U-0.54 U-0.54 Exterior doors with>2.5 ft2 glazing' U-0.40 U-0.40 U-0.40 U-0.40 m. Minimum 24-inch horizontal or vertical below-grade. ' (Building Codes Division • Department of Consumer and Business Services • State of Oregon BCD ( Budding codes 1535 Edgewater St.NW, Salem, OR 97304 • P.O.Box 14470, Salem,OR 97309-0404 Division 503-378-4133 • Fax: 503-378-2322 ♦ oregon.gov/bcd Department of Consumer and Business Services SECTION DRAWING EXAMPLES ACCEPTABLE Perimeter insulation configurations for stem wall slab-on-grade construction 9 r 45°bevel cut ,`1 45°bevel cut permissible 1. permissible 1 II Slab Slab Insulation protection "`` per N1104.2.3 R-15 rigid 241n Min. 24 in.min. insulation R-15 field Insulation INTERIOR EXTERIOR UNACCEPTABLE Interior stem wall slab-on-grade construction ',, Heat .4 . loss e� ZIllirdi R-15. JI24 . . . INTERIOR Page 2 of 3 , -_ ACCEPTABLE `v # Interior and SA'rector turnback slab-on-grade construction . N, 45°bevel cut / ; 4: permissible / , ems_..:..,_ 1J Slab % `.' 45°bevel cut NVf permissible Combined R-15rigidsirk Insulation l length insulation — protection ' 24In.min. 111111 SlabU :: per N1104.2.3 Combined 24 in.min. R-15 rigid Insulation lil1 INTERIOR TURNBACK EXTERIOR TURNBACK r . ACCEPTABLE UNACCEPTABLE Exterior monolithic ;4 A; Interior monolithic r r 45°bevel cut permissible Combined g i�: length 24 in.min. Heat ` 4 I Insulation , loss ' ` protection per 1 111 IF15:: N110423 insulation R-15 rigid '� insulation , EXTERIOR MONOLITHIC INTERIOR MONOLITHIC CONCLUSION There are many ways to properly insulate slab-on-grade floors with perimeter insulation. There are also many ways to not properly insulate slab-on-grade floors with perimeter insulation. The section drawings provide clarity through a few scenarios,but not all possible scenarios, relative to what is intended by the ORSC. As with all site-specific matters, the division's technical team recommends beginning development discussions early in the initial planning stages. This technical recommendation also reminds the end user that local building officials retain broad local flexibility and discretionary authority. Page 3 of 3