Installation Instructions

TEE W/ OPEN END
TO GRAVEL BED
FORM-A-DRAIN
FOOTING
GRAVEL
DRAIN BED
CONTINUOUS
POLYETHYLENE
VAPOR BARRIER
GRAVEL
DRAIN BED
WALL
BACKFILL
FLOOR JOISTS
3" OR 4" PVC PIPE
CAULK & SEAL ALL
BASEMENT SLAB OPENINGS
BASEMENT SLAB
PRE-WIRED JUNCTION
BOX FOR FAN:
(REQUIRED-BOTH
PASSIVE & ACTIVE)
ACTIVE SYSTEM:
IN LINE FAN FOR
POSITIVE VENT
ACTIVE SYSTEM:
SYSTEM FAILURE
WARNING DEVICE
EXHAUST
FLASHING
ROOFING
SIDING & FASCIA
Install FAD and related system components according to all applicable codes and following
instructions for conformance with the EPA “Model Standards and Techniques for Control of
Radon in New Residential Buildings.”
FOR PASSIVE SYSTEMS
1. Passive venting systems, without a fan, must have the vertical
stack vent pipe installed to the interior of the structure,
not through the outside wall. This is to ensure sufficient
temper ature differential within the stack to foster an
adequate draft.
2. The vertical stack vent pipe must be either 3" or 4" diameter PVC.
3. Connect the vertical stack vent pipe to FAD by running a
horizontal pipe from the radon vent outlet to a PVC tee placed
in the gravel. Position the tee directly beneath where the
vertical stack vent pipe run is to go. If the tee branch is not
long enough to “stub out” above the basement floor when
poured, place a small section of PVC pipe in the tee branch.
4. Fill the sub-slab space with a 4" layer of gas-permeable
material, such as clean gravel .
5. Place a continuous layer of polyethylene sheeting or an air-
gap membrane (Platon
®
) under the entire slab, overlapping
at seams, to serve as a soil-gas retarder.
6. After the basement floor has been completed, seal and caulk
any openings in the slab and foundation walls, such as drains,
sumps, utility entries, cracks and floor-wall joints to retard
soil-gas entry.
7. Install the vertical stack vent pipe run of 3" or 4" PVC pipe,
which extends from the tee branch stub out through the roof.
Do not use 90˚ elbows in the vertical stack vent pipe run
above the tee. Properly seal and flash the vent outlet at the
roof line.
8. All exposed and visible interior radon vent pipes shall be
identified with at least one label on each floor level. The label
shall read: “Radon Reduction System.”
9. Provide for rough-in wiring in the attic area near the vertical
stack vent pipe for later installation of the fan and system
failure warning device. This step is required! Should subsequent
tests indicate an elevated radon level in excess of 4 pCi/L or
the maximum level defined by local code or practices, the
passive system must be converted to an active system.
Contact the United States Environmental Protection
Agency and/or state and local environmental agen cies
for more specific information on radon control.
RADON COLLECTION & EVACUATION
SUB-SLAB PERIMETER SYSTEM INSTALLATION
One of the many advantages of Form-A-Drain is that it can
function as part of a radon reduction system with only
one simple modification to the basic installation procedure:
installation of one additional outlet in the system for use
as the radon gas outlet. This should be placed in position
near an interior chase where the vertical stack vent pipe
run is going to be located. The outlet must be installed
“upside down” with the round adapter at the top.
FOR ACTIVE SYSTEMS
1. Follow step 1 for passive systems . For active systems with a fan,
a vertical stack vent pipe within the exterior wall is permitted .
2. Follow steps 2 through 8 for passive systems.
3. Install a ventilation fan in the attic to convert system from
passive to active.
4. Install a system warning device in an easily accessible location .
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