What Is a Cool Roof Requirement Under Title 24?
Title 24 (California's energy code) requires cool roofs (the high solar reflectance — the aged SRI) on the nonresidential and the high-rise residential (the low-slope — the SRI 75+; the steep — the SRI 16+). The requirement: the reflectance (the initial and the aged — the CRRC's), the exceptions (the trade-offs — the insulation's), and the compliance (the forms — the NRCA's). The heat island's — the code's answer.
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The requirements
The low-slope (the ≤2:12 — the aged SRI 75; the nonresidential's), the steep (the >2:12 — the aged SRI 16; the residential's), the CRRC (the rated — the products'; the directory), and the aged (the 3-year — the weathering's; the initial's — the higher).
Exceptions and trade-offs
The insulation (the above-deck — the trade-off's; the R-value's), the ballast (the weight — the exception's), the PV (the solar — the covering's), and the existing (the reroof's — the triggers).
Beyond California
ASHRAE 90.1 (the 3-year SRI 64/55 — the zones'; the national), the IECC (the reflectance — the options'), the LEED (the heat island — the credit's), and the utility (the rebates' — the cool's). The cool roof is the energy's — the reflectance reducing the cooling.
The bottom line
Title 24 requires cool roofs (aged SRI 75 low-slope / 16 steep-slope, CRRC-rated) on nonresidential buildings — use insulation trade-offs or PV coverage where exceptions apply.
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