A residence in Climate Zone 3 requires wall insulation per Title 24. Which of the following meets the prescriptive requirement for wood frame walls?
Correct Answer
D) R-13 cavity + R-3 continuous insulation
Climate Zone 3 prescriptive requirements typically mandate R-13 cavity insulation plus R-3 continuous insulation for wood frame walls to meet Title 24 standards.
Why This Is the Correct Answer
Climate Zone 3 prescriptive compliance under Title 24 requires R-13 cavity insulation combined with R-3 continuous (exterior) insulation for wood-frame walls. The continuous layer addresses thermal bridging through studs that cavity-only insulation cannot correct, bringing the assembly's effective R-value up to the code threshold.
Why the Other Options Are Wrong
Option A: R-13 cavity insulation only
R-13 cavity insulation alone does not satisfy Climate Zone 3 requirements. Without the R-3 continuous layer, thermal bridging through the wood studs reduces the effective whole-wall R-value below the prescriptive minimum.
Option B: R-15 cavity insulation only
R-15 cavity insulation alone is not a listed prescriptive path for Climate Zone 3 wood-frame walls under Title 24. While a higher cavity value, it still lacks the required continuous insulation layer.
Option C: R-11 cavity insulation only
R-11 cavity insulation alone falls short of both the cavity and continuous insulation requirements for Climate Zone 3 and is not an approved prescriptive option.
Memory Technique
Think '13 + 3 in Zone 3': cavity R-13 plus R-3 continuous for Climate Zone 3. The number 3 appears in both the zone and the continuous insulation value.
More California Questions
A contractor is installing shear walls in a residence located in Seismic Design Category D. The engineer's plans call for 15/32-inch structural sheathing with 8d nails at 6 inches on center at panel edges. The contractor wants to substitute 7/16-inch OSB with the same nailing. Is this substitution acceptable?
You are reviewing plans for a mixed-use building where the ground floor will house a restaurant with commercial kitchen equipment. The architect has specified standard residential electrical requirements throughout. What Title 24 compliance issue should you identify?
According to CBC seismic provisions, what is the concept behind the 'strong column, weak beam' design philosophy?
A residence in California has 2,800 sq ft of conditioned space. The HVAC system efficiency is 16 SEER. What is the approximate Title 24 compliance margin compared to the minimum 14 SEER requirement?
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?
A contractor is installing a heat recovery ventilation (HRV) system to comply with Title 24. The system serves a 2,000 sq ft house with 3 bedrooms. What is the minimum required ventilation rate?
During construction of a basement in sandy soil conditions, you encounter groundwater at 4 feet below grade. The basement extends 8 feet below grade. What is the critical design consideration per CBC?
During a seismic retrofit project, you discover that existing concrete has a compressive strength of 2,200 psi. The engineer specifies new anchor bolts that require 2,500 psi minimum concrete strength. What is the most appropriate action?
What is the maximum allowable notch depth in a 2x10 floor joist per CBC requirements?
You're reviewing plans for a wood-framed structure in seismic design category D. The project calls for a shear wall with 15/32-inch structural sheathing and 8d nails spaced 6 inches on center at panel edges. What is the allowable shear value per the CBC?
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
During foundation excavation in the San Francisco Bay Area, you encounter bay mud at 8 feet depth. The geotechnical report specifies this layer as unsuitable for bearing. What is the most likely foundation recommendation?
Next Question
A building site has been classified as having liquefiable soils. What foundation system is typically recommended by CBC for this condition?