R-value is the single most important number in any insulation project — and most BC homeowners have never been told what their home actually needs to meet current code. In Langley and the wider Fraser Valley, BC Climate Zone 4 sets clear minimum requirements: R-50 or higher in the attic, effective R-22 to R-24 in exterior walls, and R-20 in basement and crawlspace walls. Going below these targets means your home is losing heat every season and your heating system is carrying a load it should not have to. Western Insulation explains each zone clearly, compares how different materials perform per inch, and tells you what to look for when evaluating any contractor quote. Read the complete insulation R-value guide for BC homeowners — then check all BC insulation rebates available in Langley to reduce your upgrade cost.