Where can air-impermeable insulation be installed?

Air-impermeable insulation can be installed both above and below the roof sheathing, making this the right choice. This method promotes energy efficiency by minimizing air leaks, which can lead to heat loss in winter and heat gain in summer. When applied above the roof sheathing, it helps to maintain consistent temperatures within the roof assembly, protecting it from condensation issues. Conversely, placement below the sheathing can also serve to insulate living spaces while preventing air leakage.

The other scenarios do not necessarily capitalize on the specific benefits that come with air-impermeable insulation. While it can be installed at the attic floor, limiting it to just that area misses the broader applications and advantages available in different parts of the roof structure. Installing it only at the perimeter of walls or in crawl spaces can also be effective, but these options do not leverage the insulation’s full capabilities in optimizing air control and thermal resistance. The versatility of air-impermeable insulation is crucial in providing a comprehensive solution for energy efficiency, particularly when correctly positioned in roof assemblies.