Most Langley homeowners have upgraded their attic and maybe their crawlspace — but walls are the part of the home that almost everyone forgets, even though exterior walls account for up to 25% of a home's total heat loss. In BC Climate Zone 4, the current Building Code requires an effective R-value of R-22 to R-24 in exterior walls — and most Langley homes built before 2000 fall well short of that standard. Western Insulation has been retrofitting wall insulation in Langley homes since 1998, using dense-pack blown-in insulation, spray foam, and continuous rigid foam to bring existing walls up to modern performance standards without tearing out drywall. Read the complete wall insulation guide for existing Langley homes — then book your free wall insulation assessment with Western Insulation today.