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1822.1 General. Dampproofing materials shall be installed between the floor and base materials required by Section 1824.2.

EXCEPTION: Where a separate floor is provided above a concrete slab, the dampproofing may be installed on top of the slab.

1822.2 Dampproofing Materials. Dampproofing installed beneath the slab shall consist of not less than 6-mil (0.152 mm) polyethylene, or other approved methods or materials. When permitted to be installed on top of the slab, dampproofing shall consist of not less than 4-mil (0.1 mm) polyethylene, mopped-on bitumen or other approved methods or materials. Joints in membranes shall be lapped and sealed in an approved manner.

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