Here is something most Langley homeowners are never told: a 2x6 wall filled with R-21 fibreglass batts does not actually perform at R-21. It performs closer to R-15 — because the wooden studs running through the wall conduct heat directly to the outside, bypassing the insulation between them. This is called thermal bridging, and it is one of the most common reasons well-intentioned insulation upgrades deliver less comfort than expected. The fix is a layer of continuous rigid foam on the exterior of the wall, which breaks that thermal bridge and brings the whole assembly up to the effective R-22 to R-24 required by BC Building Code. Western Insulation explains thermal bridging clearly so every Langley homeowner understands exactly what they are paying for. Read the full insulation R-value and thermal bridging guide for Langley — then explore our rigid foam insulation service in Langley BC.