According to California Title 24, what is the minimum Solar Reflectance Index (SRI) required for steep-sloped cool roofs in Climate Zone 2?
Correct Answer
B) 29
California Title 24, Section 150.1(c)11A requires steep-sloped cool roofs in Climate Zone 2 to have a minimum SRI of 29. This requirement helps reduce cooling energy consumption and supports California's energy efficiency goals. Different climate zones have varying SRI requirements based on local conditions.
Why This Is the Correct Answer
California Title 24 Section 150.1(c)11A requires a minimum SRI of 29 for steep-sloped cool roofs in Climate Zone 2. This value reflects the energy modeling that determines how much solar heat rejection is needed to meet the state's cooling-load reduction targets for that geographic area.
Why the Other Options Are Wrong
Option A: 16
16 may appear in other Title 24 contexts or earlier code cycles, but the current requirement for steep-sloped roofs in Climate Zone 2 under Section 150.1(c)11A is 29. Using an outdated or wrong-zone value is a frequent source of error.
Option C: 20
20 is below the minimum threshold of 29. While it represents a moderate reflectance level, it does not meet the current California Title 24 requirement for this climate zone.
Option D: 40
40 exceeds the minimum requirement. Although achieving SRI 40 is better performance, it is not the code-mandated minimum, and selecting it would reflect a misreading of the Title 24 tables.
Memory Technique
29 for Zone 2 steep-slope: think of 29 as just under 30, a moderate but meaningful threshold for a zone with moderately warm summers. 'Zone 2, nearly 30' can serve as a quick recall phrase.
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