PASSIVE RADON CONTROL SYSTEM N
CRAWL SPACE FOR NEW CONSTRUCTION
NOTES:
1. NSTALL A LENGTH OF 3" OR 4" DIAMETER PERFORATED DRAW
TIE HORIZONTALLY BENEATH THE SHEETWG AND CONNECT
TO THE "T" FITTNG WITH THE VERTICAL STANOPPE THROUGH
THE SOB.-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 NONCLOSEA8LE DESIGN.
3. CRCUTS SHOULD BE A MINIMUM 15 AMP. 115 VOLT.
EXHAUST OO'FROM OPEMNGS WTO
, CONDITIONED SPACES OF BUILDWG)
12" M1N. ABOVE ROOF
INTERIOR PARTITION —
LIVING AREA
SEAL AROUND
FLOOR PENETRATIONS-
FLOORING
JOIST
GRADE
LEVEL
CAP BLOCK OR OTHER SEAL
ON HOLLOW BLOCK WALLS
CRAWL SPACE
NOTE 2
SOL-GAS-REJAROER MEMBRANE SEALED AGAINST
WALL AND AROUND PENETRATIONS (MIN. 6-MIL
POLYETHYLENE SHEETING OR EQUIVALENT)
PERFORATED DRAIN
TILE: NOTE 1
•ELECTRICAL JUNCTION BOX
FOR FUTURE WSTALLATION
OF VENT FAN; NOTE 3.
-ELECTRICAL JUNCTION BOX
FOR FUTURE WSTALLATION
OF WARNING DEVICE: NOTE 3.
SUPPORT
STRAPPING
3"-4" DiA. VENT PIPE
(PVC OR EQUIVALENT)
•SEAL MEMBRANE AROUND
PIPE PENETRATION
ADJOWING SHEETS OF
MEMBRANE OVERLAPPED
AND SEALED >
PVC T-FffTING (OR EQUIVALENT)
TO SUPPORT VENT PIPE
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PASSIVE SUB-SLAB DEPRESSURIZATION RADON
CONTROL SYSTEM FOR NEW CONSTRUCTION
NOTES:
1 ALL CONCRETE SLABS THAT COME IN CONTACT WITH THE GROUND SHALL
BE LAW OVER A GAS PERMEABLE MATERIAL MADE UP OF EITHER A MN1MUM
4" THICK INFORM LAYER OF CLEAN AGGREGATE. OR A MINIMUM 4" THICK
UNIFORM LAYER OF SAND. OVERLAIN BY A LAYER OR STRPS OF MANUFACTURED
MATTING DESIGNED TO ALLOW THE LATERAL FLOW OF SOI GASES.
2. ALL CONCRETE FLOOR SLABS SHALL BE DESIGNED AND CONSTRUCTED
IN ACCORDANCE WITH LOCAL BUILDING CODES. ADDITIONAL REFS:
AMERICAN CONCRETE INSTITUTE PUBLICATIONS. "ACI302.1R" &
"ACI332R". OR THE POST TENSIONNG 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 PIPES. TOILETS. BATHTUBS OR
DRAINS PENETRATING THESE ASSEMBLIES SHALL BE FILLED 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 (10'FROM OPENINGS INTO .
CONDITIONED SPACES OF BUILDWG)
12- MIN. ABOVE ROOF
JOIST
LIVING AREA
INTERIOR PARTITION-
FLOORING 1
JOIST
GRADE
LEVEL
-CAP BLOCK OR OTHER SEAL
ON HOLLOW BLOCK WALLS
-WATERPROOF SEALANT APPLED
TO EXTERIOR WALLS
SOIL-GAS-RETAROER MEMBRANE (MIN.
6-MIL POLYETHYLENE SHEETING OR
EQUIVALENT): OVERLAP SEAMS 12" MIN.-
SEAL OPENINGS IN SLAB AND
AROUND PENETRATIONS: NOTE 3
ELECTRICAL JUNCTION BOX
FOR FUTURE INSTALLATION
OF VENT FAN; NOTE 5.
-ELECTRICAL JUNCTION BOX
FOR FUTURE WSTALLATION
OF WARNING DEVICE: NOTE 5.
- SUPPORT
STRAPPING
-3"-4" DIA, VENT PIPE
(PVC OR EQUIVALENT)
-SLAB: NOTE 2
-MIN. 4" THICK LAYER
OF GAS PERMEABLE
MATERIAL: NOTE 1
PVC T-FITTING (OR EQUIVALENT)
TO SUPPORT VENT PIPE
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ADDITIONAL COMPONENTS REQUIRED FOR ACTIVATION
OF PASSIVE SUB-SLAB DEPRESSURIZATION OR
CRAWLSPACE RADON CONTROL SYSTEM
NOTES:
1 INSTALL 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 MAWTAJN 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 PPE 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 FAJLURE
DEVICE: NOTE 3.
INTERIOR PARTITION
FLOORING
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