BC Building Code requires R-40 to R-50 minimum for attics in Climate Zone 4, but Western Insulation recommends R-60 for every Langley home — because the performance difference between code minimum and R-60 is measurable in monthly energy bills and top-floor room temperatures every single heating season. The gap between what most pre-2000 Langley homes have and what R-60 delivers is the gap between a home that fights heat loss all winter and one that holds warmth efficiently. Free attic assessment at westerninsulation.ca/attic-insulation/ with same-day response.