Western Insulation includes attic air sealing as a standard, non-negotiable step in every attic insulation project in Langley BC — not an optional add-on. Homes that receive air sealing alongside insulation save 25 to 40% on heating costs. Homes that receive only blown-in without sealing first save 10 to 15%. The difference is the warm air that escapes through gaps around pot lights, plumbing stacks, and wall top plates — bypassing the insulation entirely. We seal every bypass location before the blown-in goes in. Visit westerninsulation.ca/attic-insulation/ for the full process breakdown and to book your free Langley assessment.