Calculate the total fenestration area allowed for a 1,800 sq ft residence in Climate Zone 12 under Title 24 prescriptive requirements.
Correct Answer
D) 360 sq ft
Title 24 allows maximum 20% fenestration area: 1,800 sq ft × 0.20 = 360 sq ft of windows and glazed doors.
Why This Is the Correct Answer
Title 24 prescriptive requirements allow a maximum of 20% of conditioned floor area for fenestration. Calculation: 1,800 sq ft × 0.20 = 360 sq ft. This is the maximum total area of windows, skylights, and glazed doors permitted under the prescriptive compliance path for Climate Zone 12.
Why the Other Options Are Wrong
Option A: 450 sq ft
450 sq ft represents 25% of 1,800 sq ft (1,800 × 0.25 = 450). This exceeds the 20% Title 24 prescriptive cap and is not compliant.
Option B: 540 sq ft
540 sq ft represents 30% of 1,800 sq ft (1,800 × 0.30 = 540). This significantly exceeds the 20% limit and would require a performance path analysis to justify.
Option C: 270 sq ft
270 sq ft represents 15% of 1,800 sq ft (1,800 × 0.15 = 270). While this would be code-compliant (under the limit), it is not the maximum ALLOWED — the question asks for the maximum permissible fenestration area, which is 20%.
Memory Technique
The formula is straightforward: Floor Area × 20% = Max Fenestration. For any Title 24 calculation question, multiply the given floor area by 0.20 and you have your answer.
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