Spray foam insulation plays an important role in new construction in Langley BC — particularly for builders targeting BC Energy Step Code Step 4, which the Township of Langley requires for all new Part 9 residential construction from April 2025. Closed-cell spray foam on foundation walls and rim joists provides the required R-20 foundation insulation and continuous vapour barrier in a single application. Open-cell spray foam in wall cavities provides superior air sealing performance supporting the 1.5 ACH airtightness target at Step 4. Western Insulation works with Langley builders on Step Code compliant projects. Visit westerninsulation.ca/spray-foam-insulation/