Rim joist sealing is included as a standard component of every Western Insulation crawlspace project in Langley BC — because the rim joist is one of the most consistent heat loss and air infiltration locations in the building envelope. Closed-cell spray foam applied to rim joists provides R-12 to R-21 in a 2 to 3 inch application, seals every gap around sill plates and framing connections, and bonds permanently to concrete and wood simultaneously. Most Langley crawlspace projects include rim joist sealing at no additional scope charge. Book at westerninsulation.ca/basement-and-crawlspace-insulation/