Under California Title 24 Part 6 energy efficiency standards, what is the minimum Solar Reflectance Index (SRI) required for steep-slope cool roofs in Climate Zone 2?
Correct Answer
B) 16
Title 24 Part 6 Section 150.1(c)1B specifies that steep-slope cool roofs in Climate Zone 2 must have a minimum SRI of 16. This requirement helps reduce cooling energy consumption in California's varied climate zones, with different SRI requirements for different regions.
Why This Is the Correct Answer
Title 24 Part 6 Section 150.1(c)1B sets the minimum SRI at 16 for steep-slope cool roofs in Climate Zone 2. SRI measures a material's ability to reject solar heat; a value of 16 is the code-specified threshold for this climate zone, balancing energy savings with product availability.
Why the Other Options Are Wrong
Option A: 25
25 is not the code-specified minimum for Climate Zone 2. It may be confused with requirements for other climate zones or with thermal emittance values, but the Title 24 table does not list 25 as the threshold for this zone.
Option C: 40
40 is too high for the minimum requirement in Climate Zone 2. Higher SRI values represent better performance, but Title 24 sets zone-specific minimums; requiring 40 would disqualify many code-compliant products unnecessarily.
Option D: 20
20 is not the code-mandated value for Climate Zone 2. It falls between the correct answer and higher values, making it a plausible distractor, but the actual Title 24 table specifies 16 for this zone.
Memory Technique
Think '16 in Zone 2' — both numbers are low, matching the mild, cooler character of Climate Zone 2 (northern inland California). If the zone number is small, the SRI floor is also relatively modest.
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