Insulating Double Brick Construction, No Rim Joists
I have a 100 year old double brick house near Toronto, Canada (climate zone 5 / 6). The joists are partially embedded (all but 1.5 inches is embedded) and appears to have no rim joists. The only section with a rim joist is the parallel section of the bay windows.
Is it common with old brick homes to have embedded joists with no rim joists? I’m planning to insulate the foundation walls with 3″ of closed-cell spray foam and only 1″ between the joists to reduce the risk of rotting the embedded joist ends.
With no rim joists, how does that impact the basement insulation plan? Rim joists are a common area of air leakage. Is there a different area in my assembly that may be leaking air or does the lack of rim joists eliminate that issue? What should I do with the 1.5″-tall area of unembedded joists? I was planning on adding low expansion spray foam to fill those voids.
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