Under California's Title 24 Energy Code, what is the maximum allowable fenestration area as a percentage of conditioned floor area for residential buildings in Climate Zone 16?
Correct Answer
D) 20%
Title 24 Part 6 Section 150.1(c) limits fenestration area to 20% of conditioned floor area in Climate Zone 16 (hot climates like Palm Springs). This limitation helps control solar heat gain and improves energy efficiency in California's diverse climate zones.
Why This Is the Correct Answer
Title 24 Part 6 Section 150.1(c) caps fenestration (windows, skylights, and glazed doors) at 20% of conditioned floor area in Climate Zone 16. This hot, inland climate (e.g., Palm Springs, Victorville) receives intense solar radiation, so limiting glazed area directly reduces cooling loads and keeps the building energy-efficient.
Why the Other Options Are Wrong
Option A: 25%
25% is too high. A 25% fenestration ratio would allow excessive solar heat gain in Climate Zone 16's hot desert conditions and would violate the Title 24 prescriptive path limit of 20%.
Option B: 15%
15% is below the actual code limit. While being more conservative might seem safer, the Title 24 prescriptive limit is set at 20%, and this answer misrepresents the code requirement.
Option C: 30%
30% significantly exceeds the 20% cap. Such a large glazed area would be impermissible under the prescriptive compliance path in Climate Zone 16 without extensive performance trade-offs.
Memory Technique
Think '20 for Zone 16' — both numbers contain a '0'. Climate Zone 16 is hot, so you keep windows at a moderate 20% maximum to block the desert sun.
More trade-general-building Questions
When installing engineered lumber joists (I-joists) in California residential construction, what is the primary code requirement for web stiffeners?
What is the required attic ventilation ratio when a vapor retarder is installed on the warm-in-winter side of the ceiling according to the California Residential Code?
In California's Wildland-Urban Interface (WUI) areas, which underlayment requirement applies to Class A fire-rated roof assemblies?
In California, when installing a tankless water heater in a seismic zone, what additional requirement must be met beyond standard installation practices?
According to the California Building Code (CBC), what is the minimum lap splice length for #4 rebar in a concrete foundation wall in normal weight concrete with f'c = 3000 psi?
According to CBC requirements for retaining walls in California, what additional design consideration must be addressed for retaining walls over 4 feet in height located in seismic design categories D, E, and F?
When constructing retaining walls in California that exceed 4 feet in height, which CBC requirement must be met regarding drainage?
Under California regulations, when is a reduced pressure principle (RPP) backflow prevention assembly required for a residential water service connection?
Under California Title 24, what is the minimum electrical service size required for new single-family residential construction?
According to the California Building Code, buildings located in Seismic Design Category D must comply with which specific seismic design requirements?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass
Related Study Resources
Previous Question
According to CBC Section 1904.4, concrete testing in California requires that the average of any three consecutive strength tests equals or exceeds the specified compressive strength (f'c), and no individual test falls below what percentage of f'c?
Next Question
Under California regulations, excavations deeper than what depth require a competent person to inspect the excavation daily?