Correspondence
09/21/2006 16:16 50°# 72093 CUSTOM BIZS LUTIONS PAGE 01/0
S EP 2 1 RECD
r ACIFIC NORTHWEST ENGINEURING, INC.
September 07, 2006
City of Tigard
Building Dept.
Re; Gpiriel Woods _
SW #22
Dear Sirs,
l have reviewed the design criteria for the above named project with regards to the
change in SW # 22. Enclosed are the new calculations for SW # 22.
SW # 22 is 12.33 ft. long. The force on this wall is 2,132 lb making the shear
(force/length) 173 plf (pounds per lineal ,foot) and having a hold-down requirement of
only 185 lbs. Under these conditions it was within the parameters to use drywall (on
both sides of the wall) with 6d nailing.@ 4" / 8" O.C. on the edges and in the field
respectively, with only 16d nails @ 12" O.C. in the bottom plate to hold down the wall.
Due to the fact that the drywall was not installed as per requirement, there are two
options that would not require shortening the shear-wall. (Shortenhag: the shear-wall
would then signWcantly change the. shear value and the hold-down requirement)
The first option would be to sheet both sides of the bathroom laundry room wall with one
layer of 1/s" drywall and one side of the master closet with 2 layers of '/s" drywall. The
bathroom/laundry room uses 6d nails with 4" and 8" spacing at the edge and field
respectively. The master closet, however requires 7d mails at the same (4" and 8'~
spacing.
The second option would require one side of the wall (on the laundry room/ master closet
side- full length) to be sheeted with 7/16" O.S.B. This would be nailed with 8d nails at
6" and 12" spacing on the edge and in the field respectively.
PRp~~S
If you have any questions please feel free in calling me. NEB s~o \
Thank X
ORE
k Ellingson, E. g~
President
CAW0RX\DARRUN\Dn =7.Voc S ~C
EL
E;CG. _C,7
4242 Silver Falls Dr. N., Silverton, OR. 97381
ph # (503) 873-3184 fax # (503) 873-3907
P.E. 4 13,676
09/21/2006 16:16 5035972093 CUSTOM BIZ SOLUTIONS PAGE 02/02
HOLDDOWNS
HOLDDOWN EQUATION:
T- (v) (h) (L) - (L)2 (0.5)2 (Lft) (w) (reduction) (L) (0.5) (h) (%,n) stories)
L
SF)j ABWALLS SW22
unit shear, v 173 lb/lineal foot
wall height h 8 feet
length, L 1223 feet
joist vAdth, k-ft _ 38 feet
load from joists above, w 10 psf
wall weight, ww l 8.4 psf
controlling load (reduction) wind
# stories 1
REQ'D HOLDDOWN, T= 185 lb
SHEARWALL SCHEDULE
NAILING HOLD-DOWNS ANCHOR LENR111 OS NOTES
SW # SHEETING EDGEIFIELD SIMPSON FE
22 112" DRYWALL 6d 4" 18- 16d NAILS 12" O.C. 12.- 2X NOTE
NOTE A; MUST SHEET ONE SIDE (MASTER CLOSET) WITH 2 LAYERS OF DRYWALL AND BOTH
SIDES OF THE BATHROOMILAUNDRY ROOM WALL(SEE DETAILED LETTER)
OR
SHEARWALL. SCHEiDUL.E
NAILING HOLD--DOWNS ANCHOR LENGTH POS NOTES
SW # SHEETING EDGEIFtELD SIMPSON FF
22 7116" 0.S.B 8d 6" 112" 16d NAILS 12" O.C. 12.33 1 - 2X NOTE "A"
NOTE A: MUST SHEET ONE SIDE (FULL LENGTH) WITH 1 LAYER OF O.S.B.
intex-5plex.xis.xls