1991, 12-20 Permit App: 91008601 ResidenceL
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THESE PLANS HAVE BEEN REVIEWED
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P 8620 44th
Spokane, ua . 99206
Phone 509 926-6217 Fax 509 928-8689
mitigation system
Legend for Radon 9beneath slab
perForated pipe vent pipe
CI said 9'RBS stackAT1
RADON SYSTEM SPECIFICATIONS .
Evergreen Point
RADON MITIGATION SYSTEM
This radon mitigation system is
job-
ned only for the specific s ;tern
designed designated. . Tha Y
site address desi9 unless installed
is not guaranteed
by Cavalier Corporation
� 4p24 E 25th
lob site address, SL
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Smith Homes
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Environmental Protection Agency RCP
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radon w w
E. 8620 44th * Spokane, WA 99206
Phone (509) 926-6217 FAX (509) 928-8689
RADON SYSTEM SPECIFICATIONS, SPOKANE COUNTY:
1. Perforated pipe shall be installed within the native soil
or fill (sand, gravel or soil) at a minimum depth of 1"
below the intended slab.
2. The pipe shall be a minimum diameter of 4". meet AASHTO
M252, have perforations no wider than 1/16" and have a
minimum of 2.5 square inches of total perforations per
linear foot of pipe.
3. There shall be a minimum of 10 linear feet of perforated
pipe per hundred square feet of slab floor space.
4. The pipe shall be laid in a continuous loop. connected at
both ends to the solid stack vent pipe.
5. Any slab area, which is larger than 10 square feet, which
is isolated from other slab areas by footings or other
barriers, shall have a perforated pipe installed to the
above specifications. (The pipe can be a single length
rather than a connected loop if the area is too small or
narrow to accomodate a connected loop.)
6. A stack vent of ABS, schedule 40, minimum size 4", shall
be connected to the sub -slab piping and proceed upwards
to an exit location on the roof, and extending 14" above
the roof. The pipe shall be labeled "radon vent" every
16" or less for its full length. The pipe's attic
location shall allow a minimum of 4' of head room. When-
ever possible this exit location shall be on the backside
of the roof.
7. Any elbows in the stack vent piping shall have a
centerline radius minimum of 1.5 by pipe width.
8. An inline centrifugal fan, minimum 1.14 cfm @ 3/8" W.C.,
UL listed, manufactured specifically for radon mitigation,
maximum sone level 2.8, shall be installed in the exhaust
line, in the attic.
9. Couplings to connect the vent piping to the fan shall be
elastomeric PVC, Fernco series 1056 or equal.
10. The fan shall be hard -wired and the breaker labeled "radon
fan" .
11. All penetrations and joints in the concrete floor slab
below grade shall be sealed with caulk or grout.
12. A notice shall be permanently attached to the electrical
panel advising the owner or occupant about the radon
system and that he/she shall test the home for radon
annually. The notice shall include Cavalier's name and.
phone number.
13. All craftsmanship shall be of high quality.