Plans .F
RE VE
Q
ijN 1 4 2013
CI OF TIGARD
BUI ING DIVISION
Exist. Ext. Walls
\
( 1 1 1 )
CITY OF TIGARD New Ceiling - 9 -ft. Ht.
Approved - rl [
Conditionally Approved [ ] _ 1 1 See Letter to: Follow [ I m Exist. GLB
Attached ( ] N
l)
Permit Number: _ F
�✓ 1� — — — 321 /
Address: ( Z c. ( �P,rr" +s
By: Date C tI 1 *New Walls •
Approved plans fi
shall be on job site. L E
x Exist. 6x6 Col.
3°x4° Mtl. Frm. 35(4° Mtl. Frm.
OFFICE COPY New Box Col. w /temp. GI. w /temp. GI.
to match Exist.
11' -0"
/ /
* New Walls -
3-5/8" Mtl. Studs @ 24 "oc - 10 -ft. Ht.
5/8" Type'X' Gyp. Ea. Side - fire block @ ceiling or as req.
0 FLOOR PLAN
SCALE: 1/4" = 1' -0"
NEW PRIVATE OFFICE - City of Tigard 1 -11 -13
Centrex Construction 8250 SW Hunziker Rd., Tigard, OR 97223 ph 503 - 684 -0443
•
STRUGTU E
3 -5/8' METAL STUDS 2it O.0
!Poll SUSPENDED CEILING
• 5/8' GYP. 13D.
TYPE X
RUBBEte BASE
A •
•
STRUCTURE
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401 Suspension Systems for .
OREGOil :
REVISED 4/r,7 ° Acoustical Lay-in Ceilings
•
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the St
ate=t5P0 ) ,.f ,
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s bit. In mi l e •a 9 'Ip .4"
structures ab ,, •1:' ~ as{ 9 � -,..
Installed. ar;�tp ® .�
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b ie ti t ` t t l �I .,„V,,,•54., V 2 .,: � . ems``•
: 64:41 4I01 ; al !' r ill' `T I PY` ,. !! � C .y � t � �
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1BC section 1621.1.2
lationlof:: ' n . - •�. ' :.. •
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s���` � - >� �, r �� � ',.. � eneral Recommendations
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aCOUStId I' I ,Lc 'V .6 a � • �� sources � ' "�w�^'7' 206 (International ational Buildin Code
j . ; r. . " a" V =• 1', American Sode of T
-,:�,, y' • . Le' � ;f. ; ' +S ', �' :;:•.• ry estirtg Materials (ASTM 635, ASTM C 636), Ameri-
titan of Tthie d O t7en t V.:�1� I�' :' i S can Society of Ci I Engineers (ASCE 705) and Ceilings and Interior Systems •
}w : Association (MCA).
more ttt ifQFtit I 0r 710-110.;;•••••••••• •
•
• .� •' , . •':: Partitions that are tied to the ceiling
� +11 ' ' tTo` � 's "` ` y '�� ° height be lat � and all partitions greater than 6 feet in
ane tin' i ss 1 .f . A.e ight shall eraly braced to the r. ra shall be independent
::., :rt > °�1 ::.. ar. �Gr.1';rl structure. Bcing s I incj pe t
+ _ f I i �-•. c.. ,. J' . , th ceiling bracing system. rce
' %>.:�r o f g splay bracin em. sot,
dear n #r 9.o. ' ,.. 45 ..1 •�,.
f o r �:: i tra '• " ra ag! • For bearing partitions r c <' ,m . .w •t� ;, �til Y,, , , � t � ,:, f information on bracing of non -load dons refer to
• thesrrtte n i i )fit J , g C; ,; a , ; y . NWCB 'technical document # 01.
:regal% O egi taErter is "C r. , '' ;r ° All main beams are to be Heavy Duty MD). Sourc ASCE 7• / r,
F r. t ..,::,,. , 1:. 1 ' '• ••• US rAR 18.G:26.219 • l _ ' .� , , a cro$s tees shall be ng
st3tsmia m ` � � �•� � ' d�F% � , al capab of carrying the design load with exceeding
; r ° y .' ' � ' ` 1.::'• ' fl w ' ` • . _ deflecti equal to 1/360 of its span. Sad • Su a p4n¢ P a� GSGA zones 3•d
_ Y� �' ° These reconimendations . 1 � *-.. ; ft , •' endatbns are intended for
ess:sp t ,� ,. -'. •_ ceilings including grid, panel or
`� �`� � *A 8' � suspended ? inClud I
K+� -. f -��l�t . .r�. <_ �'� cell' ng
'• •... : . j ; ., , • ,; , , � .: . tile, light and air t
f' `'" ::: ight fixtures terminals weighing
suspension it s'terme .:4..-:;..-:...'.-,;:•;...;.,:;,:i-:•::: t jQ it' ' 7 `'. per square foot. source
` .• < ,.. ..
': no more the 4 Ib's.
• per they r-equiret tei tt - e Y r' ' ' . _ ASCE 7 -05 item 9.6.2.6.1 .
sign Catego S 13• . • -'. • •.:cr m aximum 3' ti • All wire ties are to be three tight turns
ry °.� Y e tiC ma' (76mm) 1 around itself within three inches. Twelve
the IBC. iiAanufi etlaratg " =.il '� - gagerlanger wire spaced 4 foot on center
dations should l a f9.� : € ;•: • : � :::.: :.-`
•
C AT 1) Soua� ASTM C 636 item 2 J. a
. • -. �.•;.' ,.:. f . •; : w s ,, ° Changes in ceiling planes will require post
figure Sartre ASCE 7 -05
' , '` .. e ': ' rr:: gure 1 Section 9.8.2.4.2... Item !.
4 OPTHWEST WALL 8 CEILING BUREAU SUSPENSION SYSTEMS FOR ACOUSTICAL LAY -IN CEILING_ S
T
•
•
" figure 2 • Lateral Force Bracing (figures 2 and 3) _
Lateral force 15racing • Ceilings constructed of lath and plaster or gypsum board, screw or nail attached to
suspended members that support a ceiling on one level extending from wall to wall
• shall be exempt from the lateral force bracing requirements. six:/r.®• crsci; z:,:n ::r .r
' • 45. •
or IOU
• Lateral force bracing is the use of vertical struts (compression posts) and splay
<5 e, :
wires (see figure 2). . •
�- • Lateral force bracing is required for ceilings over 144 square feet and not
— 12 gage required for ceilings less than 144 square feet provided they are surrounded by
45 0 Bess •
_ \ splaye
- 4�� - � _ _ s brace d
four walls and braced to structure. S ouri e: 5tetedfOn�rorJ, Burk Budding i �k1es L?. ^.,r, �•
a5• or less wires
• Lateral Force Bracing shall be 12 feet on center (maximum) and begin no farther
than 6 feet from walls. sourca: �.rscA sei zones 3
Cross lee Main beam \ • Seismic splay wires are to be four 12 gage wires attached to the main beam.
Wires are arrayed 90° from each. other and at an angle not. exceeding 45° from
the plane of the ceiling. Source: CISCA Sersrnit; zones 3 -
figure 3 • •. Seismic splay wires shall be attached to the grid and to the structure in such
Maximum Recommended Lengths for a manner that they can support a design load of not less than 200 pounds or
Vertical Struts the actual design load, with a safety factor of 2, whichever is greater (figure 6b).
Source: CISCA zones 3 - .
EMT oNout t • "Powder driven shot -in- anchors" when used for seismic application as part of
/" EMT conduit up to 5'10" the. prescriptive path in Seismic Design Categories D, E and F shall have an
ICC'-ES approval for seismic applications and shall require "special inspection"
3/4" EMT conduit up to 7' 8' irrespective of the type of occupancy category the structure is in. Anchors for
kicker wires (splayed wires installed for purposes other than seismic restraint) are
1" EMT conduit up to 9'9" exempt from this requirement. Source. State of Oregon, Building Codes O+t is;or
METAL U IS • • Splay wires are to be within 2 inches of the connection of the vertical strut to
suspended ceiling. Source: CISCA Seismic• zones 3 -4
Single 1 /a' metal stud (20 gauge) up to 12'0" • Rigid bracing may be used in lieu of splay wires. Source: ASCE section 9.G.2.
Back -to -back 1 metal stud up to 15'0' • Ceilings with plenums less than 12 inches to structure are not required to have
(20 gauge) . lateral force bracing. Source: Portland Building Deparrma f
Single 2'fz° metal stud (20 gauge) up to 12'6' • Vertical struts must be positively attached to the suspension systems and the
- structure above. Source: CISCA 3-4
Back -to -back 2 '/s` metal stud up to 150" • • The vertical strut may be EMT conduit, metal studs or a proprietary compression
(25 gauge) post (see figure 3), . •
: our;:,. Po ttana Building Department Moldings (figures 4a and 4b)
New: u ionum arms greater thfln r5'(1' will reborn erx�inaannq • Wall moldings (perimeter closure angles) are required to have a horizontal flange
2 inches wide. One end of the ceiling grid shall be attached to the wall mold-
ing, the other end shall have a a/ inch clearance from the wall and free to slide.
figure 4a
Attached Wall Molding Requirements Sourco: ASCE 7 -05 section 9.626.2 2 item b
• Where substantiating documentation has been provided to the local jurisdiction,
perimeter clips may be used to satisfy the requirements for the 2 -inch closure
w.Almur. MI • i angle. Source: State of Oregon, Building Codes Division
WALL
/ - 1 • The•grid shall be attached at two adjacent walls (pop rivets or approved method).
J / 4 ; fits extending to a point at least level with the bottom plane of the grid and
U °- 1 . independently supported and laterally braced to the structure above are deemed
, ,,'J to be equivalent to walls. Source: State of Oregon. Building Codes Drvsixt
: ^ ;54 „ T „ .• There shall be a minimum 3 inch clearance from the end of the grid system at
I .0 .
. un- attached walls. Source: ASCE L.r_ 7- t 7.
:er:tiO n 9.6.2.6.2.2 item b
•
Spreader Bars (figure 4b)
figure 4b • Spreader (spacer) bars shall be used to prevent the ends of the main beams
Unattached Wall Molding Requirements and cross tees at perimeter walls from spreading open during a seismic event.
• m.am�m �m0 mmn • Perimeter wires shall not be in lieu of spreader bars. Source: CISCA S son zone' :i
ic nas / 4-> Spreader bars are not required at perimeters where runners are attached directry
V /Ai Wire tying is an acceptable alternative to spreader bars. 0 ` . c to closure angles.
s p..ew ar mr • moor sutuG°
U o , "I poE'+':' • Spreader.bars are not required if a 90 degree intersecting cross or main is within 14 011/0..
mWr,wn '=mm loose, 8 inches of the perimeter wall.
/ 31.•(19 mmn
0 i 'a ` • Where substantiating documentation has been provid to the local * jurisdiction.
..4 perimeter clips may be used to satisfy the requirements for spreader bars.
. Solrrcr: State of Oregon. Building Codes Division
. -;r-"1 T y;i.:.. L CEILING tJG ?URE.AU • SUSPENSION SYSTE.MS FOP ACOUSTICAL LAY•W CEILINGS • .
•
Hanger (Suspension) Wires (figures 5a and 5b) figure 5a
• Hanger and perimeter wires must be plumb within 1 in 6 unless (figure 5a) counter
sloping wires are provided (figure 5b) Source: ASTM G 636 section 7.1.4
• Hanger wires shall be 12 gage and spaced 4 feet on center or 10 gage spaced 5
feet on center. source: ASTM C 636
• Any connection device at the supporting construction shall be capable of carrying
not less than 100 pounds. Source: CISCA zones 3.4
• Powder driven shot -in- anchors are an approved method of attachment for hanger
wires. ,ounce: Slate of Oregon, Building Codes Division
• . Terminal ends of each main beam and cross tee must be supported within 8 inches •
of each wall with a perimeter wire (see figure 4 & 5 b). Source: CISCA zones 3.4
• Wires shall not attach to or bend around interfering material or equipment. A figure 5b • Counterstoping •
trapeze or equivalent device shall be used where obstructions preclude direct
suspension. Trapeze suspensions shall be a minimum of back -to -back 1' /a inch
3•rr6mn
cold - rolled channels for spans exceeding 48 inches. source: C1SC:A zones 3 -4
41 r"
Electrical fixtures I .• •
• Light fixtures weighing less than 10 pounds shall have one 12 gage hanger wire I )
connected from the fixture to the structure above. This wire may be slack. Source:
,;;ti;:A Seimic zones 3 -4
• Light fixtures weighing more than 10 pounds and less than 56 lbs. shall have two
12 gage wires attached at opposing corners of the light fixture to the structure
above. These wires may be slack. Source: CISCA Seismic zones 3 -4.
• Light Fixtures weighing more than 56 lbs. shall be supported by directly from the figure 6a
structure above. These wires must be taut. Source: CISCA Seismic zones 3 -4 Vertical hanger wire attachment
o Pendant mounted fixtures shall be directly supported from the structure above
using a 9 gage wire or an approved alternate support without using the ceiling Shot-in anchor (;l 3r4
• suspension system for direct support. Source: CISCA Seismic zones 3.4 S tructural concrete L_._
o Tandem fixtures may utilize common wires.
Ceiling clip 5
ill
Mechanical Services 3 turns
o Terminals or services weighing 20 lbs. but not more than 56 lbs. must have two
12 gage wires connecting them to the ceiling system hangers or the structure vertical hanger wir /
above. These wires may be slack. Source: CISCA Seismic zones 3.4
• Terminals or services weighing more than 56 lbs. must be independently sup- figure 6b
ported directly from the structure above. These wires must be taut. source.. CISLJ Splayed seismic bracing wire attachment .
Seismic zones 3.4
drill-In expansion anchor fin •
Seismic Separation Joints (figure 7) I tt
• For ceiling areaS.exceeding 2,500 square feet, a seismic separation joint or full Structural concrete
height wall partition that breaks the ceiling shall be provided unless analyses are Steel strap t' wide x 2' long x
s bracing system, closure angles and t2 gage minimum
• performed of the ceilin
g g y penetrations to
provide sufficient clearance. source: ASCF. 7-05 item 5.G.2.G.2.7. d
3 turns
o The layout and location of the seismic separation joint shall be per the designer Splayed seismic bracing wire
of record and noted on the plans. If a seismic separation joint is required by the
designer, the designer may use the generic joint detailed in this document or a
• proprietary joint. The amount of free movement (gap design) shall be a minimum figure 7
of 3/4 inch. Source: Slate of Oregon, Building Codes Division
• In lieu of seismic separation joints, the ceiling may be divided into areas less than
2500 square feet.by the use of partitions or soffits as follows: partitions shall extend
a minimum of 6 inches above the level of the plane of the grid and shall be inde- .
pendently braced to the structure above. Soffits shall extend to a point at least level I
with the bottom pane of the grid and shall be independently supported and laterally 61
• braced to the structure above. Source: Stale of Oregon Building Codes Division l
• Other than partitions and soffits, seismic joints may not be used as part of a fire
•
rated ceiling assembly unless substantiating documentation is provided. source:
`-rare c•r Oregon Building Codes Division _ -- — -- -
t
Flange
L- 9r1• I PoP
miNmum Rivet .
NORTHWEST WALL $ CEILING BUREAU • SUSPENSION SYSTEMS FOR ACOUSTICAL LAY -IN CEILINGS