1. (a) Underfloor material (with or without patches) shall be tight-fitted against any floor penetrations and prevent the entrance of insects or rodents. The material shall be suitable for patches and repair, and the repair life shall be equivalent to the material life. The material shall meet or exceed the level of 48-inch pounds of puncture resistance in accordance with ASTM D 781 Standard Test Methods for Puncture and Stiffness of Paperboard, and Corrugated and Solid Fiberboard (1973).

   1. (1) Exemption: Non-insulated moisture-resistant under floor construction shall not require underfloor closure material protection.
   2. (2) Commercial modular and special purpose commercial modular units not designed for placement on a continuous foundation shall be protected in accordance with California Code of Regulations, Title 24, Part 2, California Building Code, Appendix F.
2. (b) Underfloor material shall be installed in accordance with installation instructions furnished by the manufacturer of the material.
3. (c) Patch installation instructions shall be included in the commercial modular manufacturer's instructions (See Section 4368 of this subchapter).

Underfloor closure material and its method of construction and installation shall resist transportation damage and shall be of a water resistant material that maintains protection against infiltration or penetration to the underside of the commercial modular by water, vermin and vectors. The closure material shall be listed and tested material as noted in Subsection (a) of this section and installed as follows:

Note: Authority cited: Section 18015, Health and Safety Code. Reference: Section 18028, Health and Safety Code.

History

1. Amendment filed 9-7-73; effective thirtieth day thereafter (Register 73, No. 36).

2. Amendment filed 12-7-79; effective thirtieth day thereafter (Register 79, No. 49).

3. Amendment of section heading, section and Note filed 9-19-2011; operative 10-19-2011 (Register 2011, No. 38).