BC Building Code requires a minimum effective R-value of R-20 for basement walls in Langley BC — and most homes built before 2000 fall short of this requirement. Closed-cell spray foam applied directly to concrete foundation walls bonds to the concrete, provides R-20 or above, and creates a vapour barrier that eliminates condensation between the insulation and the cold concrete surface. For Langley homes with any moisture history in the basement, spray foam is the most reliable and permanently effective solution. Book at westerninsulation.ca/basement-and-crawlspace-insulation/