EXCEPTION to Section 160.1(a)2C: Vents that do not penetrate the roof deck and are instead designed for wind resistance for roof membranes are not within the scope of Section 160.1(a)2C.
EXCEPTION to Section 160.1(c): A building with a controlled ventilation or unvented crawlspace may omit raised floor insulation if all of the following are met:
- The foundation walls are insulated to meet the wall insulation minimums as shown in TABLE 170.2-A; and
- A Class I or Class II vapor retarder is placed over the entire floor of the crawlspace; and
- Vents between the crawlspace and outside air are fitted with automatically operated louvers that are temperature actuated; and
- The requirements in Reference Residential Appendix RA4.5.1.
EXCEPTION 1 to Section 160.1(e)1: Up to 0.5 percent of the conditioned floor area is exempt from the maximum U-factor requirement.
EXCEPTION 2 to Section 0.1(e)1: For dual-glazed greenhouse or garden windows, up to 30 square feet of fenestration area per dwelling unit is exempt from the maximum U-factor requirement.
EXCEPTION to Section 160.1(f)2: An outside combustion-air intake is not required if the fireplace will be installed over concrete slab flooring and the fireplace will not be located on an exterior wall.
EXCEPTION to Section 160.1(f)3: When a gas log, log lighter, or decorative gas appliance is installed in a fireplace, the flue damper shall be blocked open if required by the CMC or the manufacturer's installation instructions.
NOTE: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, and 25943, Public Resources Code.