A residential building in California has a floor area of 2,400 square feet with R-30 ceiling insulation and dual-pane windows. What is the maximum allowable fenestration area under Title 24 for Climate Zone 3?
Correct Answer
D) 480 square feet
Title 24 limits fenestration to 20% of conditioned floor area in Climate Zone 3. 2,400 sq ft × 0.20 = 480 square feet maximum.
Why This Is the Correct Answer
Title 24 Part 6 caps fenestration at 20% of conditioned floor area for residential buildings in Climate Zone 3. 2,400 sq ft × 0.20 = 480 sq ft. This limit controls solar heat gain and heat loss through glazing, which are significant energy drivers in coastal California climates.
Why the Other Options Are Wrong
Option A: 840 square feet
840 square feet would be 35% of floor area — far above the 20% cap. This figure has no basis in Title 24 and would result in a failing compliance calculation.
Option B: 720 square feet
720 square feet equals 30% of floor area, exceeding the 20% maximum. A candidate might arrive here by misremembering 30% as the fenestration cap or by using the wrong percentage in the calculation.
Option C: 600 square feet
600 square feet equals 25% of floor area, still above the 20% limit. This is a plausible distractor for candidates who confuse Title 24's 20% cap with a different percentage.
Memory Technique
Remember '20% fenestration rule' — windows and glazing cannot exceed 1/5 of the floor area. Think of a 2,000 sq ft house: 20% = 400 sq ft of glass, roughly four 10×10 window walls. Any more and Title 24 compliance requires trade-offs.
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You're constructing a foundation on liquefiable soils identified in a California coastal area. The geotechnical report recommends deep foundations. Which option is most commonly specified?