Coat the area inside the hole thoroughly with Miracle Paint to prevent further rusting, then make a patch of 3 layers of fiberglass mat soaked in Miracle Paint and apply it over the rust hole. When dry overnight you will not believe how strong this repair. Even banging on it will make you think you are banding on sheet metal.
Spray Foam Insulation . Spray foam is excellent for both R-value and for air-sealing. As a high-end material typically used for energy-efficient construction, spray foam is overkill for most garage projects. But it might make sense if you're converting the garage to living space.
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Sep 11, 2020 · If you overfill an area, trim off the excess foam with a serrated utility knife once it's cured. Fill openings slightly less than halfway full, allowing the sealant to expand. If the foam in the straw applicator hardens, trim the straw down until you can spray foam again.
The only reason you don't see more spray foam insulation is cost. Builders are not going to put money into something that is not required, not seen and that only one in a 100 customers understand. (And there are always lots of armchair advisors who will dream up a hundred and one ingenious ways to supposedly do the same job at half the cost.)
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If you have installed a replacement window or replacement sashes, the cavity for the sash weights can be filled with insulation. Fill the opening by gently stuffing with fiberglass insulation or with spray foam (the nonexpanding type is easiest to control).
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