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Re: Alternative Crawl Space Ventilation for Gabriel Woods subdivision I GFI k7 .
MAR %
� 'e"'Y F T C
Attn: Mark ARD ��t�P!
E UPLD c DiViS .
Due to the foundation vent limitations on the interior units here at Gabriel Woods not allowing
us to provide the adequate amount of crawl venting we have had Roth Heating and Cooling provide
Humidistat fans for these crawl spaces. By using a 6" 150 CFM placed in the crawl with 6" ducting
running from the foundation vents in the back to the front crawl space, this 150 CFM fan will replace
the 1950 Cubic feet of air space 4.6 times an hour and will be able to pull air from all areas of the crawl
space. The fan is also wired with a humidistat sensor that will gauge the humidity of the crawl space
and function as needed. We have also provided the fan with a troubleshooting line that runs to the ga-
rage where a red sensor light will turn on if ever needed to indicate that the fan is not functioning prop-
erly.
The following are the Lot numbers, Addresses and Permit numbers for all homes that require this me-
chanical Ventilation:
, Lot 2: 13865 SW Anna Ct. MST 2006 - 100444—
Lot 3: 13852 SW Anna Ct. MST 2006-10045A' L' (.4 d l' � gi p ' i �
Lot 6: 13819 SW Anna Ct. MST 2006 -10048 4' 11711
Lot 7: 13807 SW Anna Ct. MST 2006 - 10049
t/ Lot 12: 13804 SW Anna Ct: MST 2006 - 10052
/ Lot 13: 13814 SW Anna Cf. MST 2006 - 10053
Lot 14: 13826 SW Anna Ct. MST 2006 -10054 A
V Lot 17: 11472 SW Lomax Terr. MST 2006-10057k
1' Lot 18: 11480 SW Lomax Terr. MST 2006-10058
✓ Lot 19: 11488 SW Lomax Tern MST 2006-10059+
Lot 22: 11489 SW Rebecca Terr. MST 2006 - 10062..
Lot 23: 11481 SW Rebecca Terr. MST 2006-10063F
Lot 24: 11475 SW Rebecca Tern MST 2006-100641 -
Thank you,
Brad Miller
Project Manager
INTEX Custom Homes
ROTH !Cory MacGregor
F"esIder,t
HEATING & COOLING
Crawl Ventilation for Gabriel Woods
1950 cubic ft. air space in crawl
150 cfin fan with humidistat will change out air in crawl 4.6•- times an hour
crawl ventilation provided by Roth Heating and Cooling
RECE IVED
r. MA R 1 2 2007
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Cii :y of Tigard
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• Cordorate Hcacqua iers • P.V. P■s • 6950 5 .ndersnn Road • Canby, Drogor 970•.3
't 503.766.1 205 • ra • 503 2EE 34.713 • Ct 14005
Central Oregon Branch • 753? 5■h H.gn Desert awe • Priroail'e.Oiegon 97714
Mobile . i eat.co 1E.0 ^_OL
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09/21/2006 16:16 50' ^'72093 CUSTOM BIZ SOLUTIONS PAGE 01/0
SEP 2 1 RECD
'Cl' %11I�l i1 ',,,r.§-'' ‘ .--
C'
PACIFIC NORTHWEST \ ORT1:iWEST ENGINEERING, INC.
September 07, 2006
City of Tigard
Building Dept.
Re: Gabriel _Woods .
SW #22
Dear Sirs,
I 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. (Shortening the shear -wall
would then significantly change the shear value and the hold -down requirement)
The first option would be to sheet both sides of the bathroom/la.undry room wall with one
layer of 1 /2" drywall and one side of the master closet with 2 layers of ' /2" 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 nails 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.
e �&p PRO,c�
If you have any questions please feel free in calling me. r,' NG 1 NG . S.5> \\
Thank X
, /1 I • •
i kag . -P
r'
eh ORE .'
k Ellingson,i' E. g
President � Y i \ c `O
EXP. ; _07
4242 Silver Falls Dr. N., Silverton, OR. 97381
ph # (503) 873 -3184 fax # (503) 873 -3907
P.E. # 13,676
09/21/2006 16:16 5035972093 CUSTOM BIZ SOLUTIONS PAGE 02/02
HOLDDOWNS
HOLDDOWN EQUATION:
T= (v) (h) (L) — (L) (0.5) (L ) (w) (reduction) -- (L) (0.5) (h) (w (# stories)
L
SHEARWALLS SW22
unit shear, v 173 lb/lineal foot
wall height, h 8 feet
length, L 12.33 feet
joist width, L inb 38 feet
load from joists above, w 10 psf
wall weight, w 8.4 psf
controlling load (reduction) wind
# stories 1
REQ'D HOLDDOWN, T= 185 lb
SHEARWALL SCHEDULE
NAILING HOLD -DOWNS ANCHOR LENGTH POST NOTES
SW # SHEETING EDGE/FIELD (SIMPSON) (FEET)
22 1/2" DRYWALL 6d 4" / 8" 16d NAILS @ 12" O.C. , 12.33 1 - 2X NOTE °A"
NOTE A: MUST SHEET ONE SIDE (MASTER CLOSET) WITH 2 LAYERS OF DRYWALL AND BOTH
SIDES OF THE BATHROOM/LAUNDRY ROOM WALL(SEE DETAILED LETTER)
OR
SHEARWALL SCHEDULE
NAILING HOLD -DOWNS ' ANCHOR LENGTH POST NOTES
SW* SHEETING EDGE/FIELD ( SIMPSON) (FEET)
22 7/16" 0.8.13 8d 6"1 12" ,16d NAILS @ 12" O.C_ 12.33 1 - 2X NOTE "A"
NOTE A: MUST SHEET ONE SIDE (FULL LENGTH) WITH 1 LAYER OF Q.S.B.
intex-5plex.xls.xls
ROTH Kory MacGregor
President
HEATING & COOLING
Ventilation for any unit with inadequate ventilation
Roth Heating and Cooling will install a 200 CFM fan which will ventilate the crawl
space.
The crawl space is approximately 1,100 cubic ft. divided by 200 cubic feet per minute.
This fan will change the air out 10 times an hour.
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. „ _ - / Corporate Headquarters • P.O. Box 1265 • 6990 S. Anderson Road • Canby, Oregon 97013
Ph. 503.266.1249 • Fax: 503.266.3478 • CCU 14008
www.roth- heat.corn