Spraying foam insulation.
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Previously:
https://www.homemadetools.net/forum/...427#post196764
https://www.homemadetools.net/forum/...306#post126907
https://www.homemadetools.net/forum/...232#post195976
https://www.homemadetools.net/forum/...351#post154459
https://www.homemadetools.net/forum/...792#post152292