The rim joist — perimeter framing at the top of your foundation wall — is one of the highest heat loss and air infiltration locations in a Langley home. Uninsulated or poorly insulated rim joists create a direct thermal bridge from the cold foundation into the floor above. Closed-cell spray foam applied to rim joists in a 2 to 3 inch layer delivers R-12 to R-21, seals every gap around sill plates and framing connections, and bonds permanently to concrete and wood simultaneously. Most Langley rim joist spray foam projects are completed as part of a broader crawlspace scope in a single day. Book at westerninsulation.ca/spray-foam-insulation/