A professional crawlspace insulation project from Western Insulation in Langley follows a specific sequence that ensures the completed assembly performs correctly in BC's damp climate. Step one: professional inspection of existing conditions, moisture levels, and pest evidence. Step two: removal of any existing damaged or contaminated material. Step three: rim joist sealing with closed-cell spray foam. Step four: crawlspace wall spray foam to R-20 or above. Step five: vapour barrier installation across the crawlspace floor. Step six: documentation for BC rebate submission. Book at westerninsulation.ca/basement-and-crawlspace-insulation/