§ 14.04.506. Section 4.106.5.1 through 4.106.5.4 are added to the 2016 California Green Building Standards Code as follows.

4.106.5.1 Cool Roof. For new buildings and additions or alterations to existing roof framing, roofing materials must comply with sections 4.106.5.2 —4.106.4 and table 4.106.5.

4.106.5.2 Cool Roof for Reduction of Heat Island Effect. Roofing material shall comply with the following.

4.106.5.3 Solar Reflectance. Roofing material shall have a minimum 3-year aged solar reflectance equal to or greater than the values specified in Table 4.106.5.

4.106.5.4 Thermal Emittance Roofing materials shall have a Cool Roof Rating Council (CRRC) initial or aged thermal emittance equal to or greater than those specified in Table 4.106.5.

Solar reflectance values shall be based on the aged reflectance value of the roofing product or the equation in Section A4.106.5.1 if the CRRC certified aged solar reflectance are not available Certified thermal emittance used in the Solar Reflectance Index Calculation Worksheet (SRI-WS) developed by the Energy Commission may be either the initial value or the aged value listed by the CRRC.

Exceptions:

1.

Roof repair,

2.

Roof replacement when the roof area being replaced is equal to or less than 50% of the total roof area, or

3.

Building-integrated photovoltaic (BIPV).

TABLE 4.106.5
ROOF SLOPE	MINIMUM 3-YEAR AGED SOLAR REFLECTANCE	THERMAL EMITTANCE
≤2:12	0.65	0.75
>2:12	0.23	0.75

 

(Ord. No. 7289, § 3(J), 12-12-2016)