PASSIVE RADON CONTROL SYSTEM IN
CRAWL SPACE FOR NEW CONSTRUCTION
NOTES:
1. WSTALL A LENGTH OF 3" OR 4" DIAMETER PERFORATED DRAIN
TILE HORIZONTALLY BENEATH THE SHEETNG AND CONNECT
TO THE "T" FITTWG WITH THE VERTICAL STANOWE THROUGH
THE SOIL-GAS-RETARDER MEMBRANE. THIS HORIZONTAL PPE
SHOULD NORMALLY BE PLACED PARALLEL TO THE LONG
DIMENSION OF THE HOUSE AND SHOULD EXTEND NO CLOSER
THAN 6 FEET TO THE FOUNDATION WALL.
2. VENTILATE CRAWLSPACES IN CONFORMANCE WITH
LOCAL COOES: VENTS SHALL BE OPEN TO THE
EXTERIOR AND BE OF NONCLOSEABLE DESIGN.
3. CIRCUITS SHOULD BE A MINIMUM 15 AMP, 115 VOLT.
EXHAUST CIO'FROM OPENINGS WTO
CONDITIONED SPACES OF BUILDING)
12" MIN. ABOVE ROOF
i
INTERIOR PARTITION
LIVING AREA
SEAL AROUND
FLOOR PENETRATIONS
SUPPORT
STRAPPING
CAP BLOCK OR OTHER SEAL
ON HOLLOW BLOCK WALLS
CRAWL SPACE
NOTE 2
ELECTRICAL JUNCTION BOX
FOR FUTURE INSTALLATION
OF VENT FAN: NOTE 3.
ELECTRICAL JUNCTION BOX
FOR FUTURE NSTALLATION
OF WARNING DEVICE: NOTE 3.
GRADE
LEVEL
SOIL-GAS-RETARDER MEMBRANE SEALED AGAINST
WALL AND AROUND PENETRATIONS (MIN. 6-MIL
POLYETHYLENE SHEETING OR EQUIVALENT)
PERFORATED DRAIN
TILE: NOTE 1
3"-4" DIA. VENT
(PVC OR EQUIVALENT)
SEAL MEMBRANE AROUND
RPE PENETRATION
ADJOINING SHEETS OF
MEMBRANE OVERLAPPED
AND SEALED ,
PVC T-FHPTING (OR EQUIVALENT)
TO SUPPORT VENT PIPE
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PASSIVE SUB-SLAB DEPRESSURtZATtON RADON
CONTROL SYSTEM FOR NEW CONSTRUCTION
NOTES:
t ALL CONCRETE SLABS THAT COME IN CONTACT WITH THE GROUND SHALL
BE LAID OVER A GAS PERMEABLE MATERIAL MADE UP OF EITHER A MWIMUM
4" THICK UNIFORM LAYER OF CLEAN AGGREGATE. OR A MINIMUM 4" THKX
UNIFORM LAYER OF SAND. OVERLAIN BY A LAYER OR STRPS OF MANUFACTUREO
MATTING DESIGNED TO ALLOW THE LATERAL FLOW OF SOIL GASES.
2. ALL CONCRETE FLOOR SLABS SHALL BE DESIGNED AND CONSTRUCTED
IN ACCORDANCE WITH LOCAL BUILDING COOES. ADDITIONAL REFS=
AMERICAN CONCRETE INSTITUTE PUBLICATIONS. "ACI302.1R" fc
"ACI332R". OR THE POST TENSIONING NSTITUTE MANUAL. "DESIGN
AND CONSTRUCTION OF POST-TENSIONED SLABS ON GROUND".
3. ALL OPENINGS. GAPS AND JOINTS IN FLOOR AND WALL ASSEMBLIES IN
CONTACT SOIL OR GAPS AROUND PPES. TOILETS. BATHTUBS OR
DRAINS PENETRATING THESE ASSEMBLES SHALL BE FtLEO OR CLOSED
WITH MATERIALS THAT PROVOE A PERMANENT AIR-TIGHT SEAL. SEAL
LARGE OPENINGS WITH NON-SHRINK MORTAR. GROUTS OR EXPANDING
FOAM MATERIALS AND SMALLER GAPS WITH AN ELASTOMERIC JOINT
SEALANT. AS DEFINED IN ASTM C920-87.
4. VENT PIPES SHALL BE INSTALLED SO THAT ANY RAINWATER OR
CONDENSATION DRAINS DOWNWARD WTO THE GROUND BENEATH THE
SLAB OR SOIL-GAS-RETARDER MEMBRANE.
5. CIRCUITS SHOULD BE A MINIMUM 15 AMP. 115 VOLT.
EXHAUST
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ADDITIONAL COMPONENTS REQUIRED FOR ACTIVATION
OF PASSIVE SUB-SLAB DEPRESSURIZATION OR
CRAWLSPACE RADON CONTROL SYSTEM
NOTES:
1. WSTALL THE VENT FAN IN THE VERTICAL RUN OF THE VENT PIPE.
THE SIZE AND AIR MOVEMENT CAPACITY OF THE VENT FAN SHALL
BE SUFFICIENT TO CREATE AND MAINTAIN A PRESSURE FIELD
BENEATH THE SLAB OR CRAWLSPACE MEMBRANE THAT IS LOWER
THAN THE PRESSURE ABOVE THE SLAB OR MEMBRANE.
2. ALL POSITIVELY PRESSURED PORTIONS OF THE VENT PIPE AND
FAN SHALL BE LOCATED OUTSIDE THE HABITABLE SPACE
THE BUILDING.
3. PROVIDE A VISIBLE OR AUDIBLE WARNING SYSTEM TO
ALERT THE BUILDING OCCUPANT IF THERE IS A LOSS
OF PRESSURE OR AIR FLOW IN THE VENT PIPE.
EXHAUST <10'FROM OPENINGS INTO
CONDITIONED SPACES' OF BUILDING)
12" MIN. ABOVE ROOF
FAN COUPLING TO PIPE
ROOF BRACE
FAN; NOTE 1
& NOTE 2
ELECTRICAL
JUNCTION BOX
LIVING AREA
SYSTEM FAILURE
DEVICE: NOTE 3.
INTERIOR PARTITION
FLOORING
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