Philadelphia Code Subcode R, § R506 CONCRETE FLOORS (ON GROUND)
SECTION R506 CONCRETE FLOORS (ON GROUND)
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[Pursuant to the UCC, delete Section R506.2.3 and replace as follows:]
R-R506.2.3 Vapor retarder. A minimum 6 mil (0.006 inch: 152 mm) polyethylene or approved vapor retarder with joints lapped not less than 6 inches (152 mm) shall be placed between the concrete floor slab and the base course or the prepared subgrade where a base course does not exist.
Exception: The vapor retarder is not required for the following:
1. Garages, utility buildings and other unheated accessory structures.
2. For unheated storage rooms having an area of less than 70 square feet (6.5 m2) and carports.
3. Driveways, walks, patios and other flatwork not likely to be enclosed and heated at a later date.
4. Where approved by the building official, based on local site conditions.
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