07/25/2026
The rim joist is the band of wood that runs around the perimeter of your crawl space, where the floor meets the foundation. It’s the single biggest air leak in most Eastside homes — and the easiest one to fix.
Most crawl space jobs in Seattle skip it. The crew lays a new v***r barrier across the dirt floor and calls it done. The rim joist keeps leaking 30% of the conditioned air upstairs.
A two-part foam sealant + R-13 rigid foam strip across the rim joist takes one technician about three hours. It pays back in four to six months in winter heating savings, year-round.
Next time you compare crawl-space quotes, ask: ‚Does this include rim joist sealing?‘
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***rbarrier