When the manufacturer's installation instructions require the installation of a vapor barrier on the surface of the ground, the barrier shall be installed under the footings and in accordance with the manufacturer's installation instructions.
Cal. Code Regs. Tit. 25, § 1334.6
Note: Authority cited: Sections 18300 and 18613, Health and Safety Code. Reference: Sections 18300 and 18613, Health and Safety Code.