According to California Title 24 energy efficiency requirements, when installing windows in wood-framed walls, what additional consideration must be addressed regarding thermal bridging?
Correct Answer
B) Window frames must be thermally broken or have continuous insulation
Title 24 Section 150.0(k) requires consideration of thermal bridging at fenestration. Window installations must address thermal breaks either through thermally broken frames or continuous insulation strategies to meet California's stringent energy efficiency requirements and prevent thermal bridging that reduces overall wall assembly performance.
Why This Is the Correct Answer
California Title 24 Section 150.0(k) specifically addresses thermal bridging at fenestration points. Window frames create thermal bridges that allow heat transfer through the building envelope, reducing energy efficiency. The code requires either thermally broken window frames (frames with thermal breaks built into their design) or continuous insulation strategies around the window installation to minimize thermal bridging and maintain the thermal performance of the wall assembly.
Why the Other Options Are Wrong
Option A: Vapor barriers must extend 6 inches beyond the window frame
While vapor barriers are important for moisture control, Title 24's thermal bridging requirements don't specify a 6-inch extension beyond window frames. Vapor barrier installation follows different code sections and is primarily concerned with moisture management, not thermal bridging prevention.
Option C: Rough opening must be oversized by 1 inch on all sides
Rough opening sizing is determined by structural and installation requirements, not thermal bridging considerations. A 1-inch oversize on all sides is a general installation practice but doesn't address the thermal bridging issue that Title 24 specifically targets at fenestration points.
Option D: Metal flashing must be insulated with R-3 rigid foam
While metal flashing requires proper installation, Title 24's thermal bridging requirements don't mandate R-3 rigid foam insulation for flashing. This option confuses general insulation practices with specific thermal bridging mitigation strategies required for window frames.
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