Quoted from yaksplat:Here's one of those, not too exciting, but will likely pay off in the long run things.
Rim joist insulation.
I probably should have done this a long time ago, but energy savings was not high on my list of priorities. Due to the amazing foundation work, I had plenty of air leaks, even with the sill seal in place. I mean full on daylight. Either under the sill plate or between the rim joist and sill plate.
I decided to put 2" of extruded foam (R10) against the rim joist, held in place by spray foam and then a layer of rock wool (R23) and then also a 1" layer of extruded foam (R5) outside the sill plate on the top of the foundation. This is more for air sealing.
Step 1: buy 4x8 sheets and cut all of the pieces. Foam on the table saw is a blast.
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A layer of spray foam works like adhesive against the foundation. A 4" piece outside the sill plate and a 2" thick piece against the rim joist. 2 small pieces to fit in the web of the i-joists.
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Topped off with R23 rock wool. It's a nice and rigid solution.
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The torpedo heater in the basement has already been turning on at a much lower frequency. Mission accomplished.
WOW, that's a TON of bitch work there. I have a smaller place then you and I called the spray foam guys and just had them shoot the rim joists. I had some other spaces for them to do at the same time so it wasn't just that but still low sq ft. That was years ago though, probably couldn't get anyone to show up for that sized job anymore.