Langley homeowners asking about attic insulation R-value often hear two different numbers — R-50 and R-60 — and are left wondering which one they actually need. BC Building Code sets a minimum of R-40 to R-50 for attics in Climate Zone 4, but Western Insulation recommends pushing to R-60 wherever possible. The reason is straightforward: the attic is the single biggest source of heat loss in most homes, and the performance difference between a code-minimum attic and a genuinely well-insulated one shows directly on your monthly energy bill. Blown-in fibreglass at R-2.5 per inch means reaching R-60 requires around 24 inches of coverage — a standard depth our team installs across Langley every week. Get the full breakdown in our attic insulation R-value guide for Langley BC — then learn more about our blown-in insulation service in Langley.