Where is insulation commonly absent in conditioned spaces?

Insulation is often absent in vertical sidewalls, skylight chases, and crawl space joists in conditioned spaces due to specific construction practices and design choices that overlook these areas.

Vertical sidewalls may not be adequately insulated because insulation installation in these areas can be challenging due to framing and structural constraints. Skylight chases can be overlooked because they are often treated as a continuation of the roof, and builders may not prioritize insulating them, despite the significant heat loss that can occur. Crawl space joists also tend to be under-insulated because builders sometimes focus on insulating the perimeter walls of the crawl space rather than the joists themselves, which can lead to thermal bridging and make these areas vulnerable to drafts.

Overall, the absence of insulation in these specific locations can result in energy loss and contribute to thermal discomfort within the conditioned spaces. Recognizing these areas is crucial for improving energy efficiency and comfort in buildings.