For California Title 24 compliance, what is the minimum solar reflectance index (SRI) required for steep-slope cool roofs in Climate Zone 2?
Correct Answer
A) 29
California Title 24, Part 6, Section 150.1(c)7 requires steep-slope roofs in Climate Zone 2 to have a minimum SRI of 29. This cool roof requirement helps reduce building energy consumption by reflecting solar heat, supporting California's energy efficiency goals.
Why This Is the Correct Answer
California Title 24, Part 6, Section 150.1(c)7 requires steep-slope roofs in Climate Zone 2 to have a minimum Solar Reflectance Index (SRI) of 29. This relatively modest threshold reflects Climate Zone 2's moderate climate, where the energy savings from cool roofs are less dramatic than in hotter California zones.
Why the Other Options Are Wrong
Option B: 75
An SRI of 75 is a high-performance cool roof value more appropriate for low-slope (flat) roofs or hotter climate zones. It does not match the Title 24 requirement for steep-slope roofs in Climate Zone 2.
Option C: 16
An SRI of 16 falls below the minimum threshold required by Title 24 for Climate Zone 2. This value would not meet the cool roof standard and could not be used for compliance.
Option D: 40
An SRI of 40 exceeds the minimum requirement for Climate Zone 2 steep-slope roofs. While a roof with SRI 40 would comply, it is not the minimum — the correct minimum is 29.
Memory Technique
For Climate Zone 2 steep-slope roofs, remember 'SRI 29 — the low-bar cool roof.' Climate Zone 2 is one of California's cooler northern zones, so the energy benefit of cool roofing is lower, and the SRI minimum is correspondingly modest at 29.
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