I’m a small crawlspace contractor in E Tennessee. I turn the lights of in mid-day and look for light coming in I use my flashlight on & off marking light areas with a big fat magic marker. Seal these. I can do most homes with 1 board of 1” foam board and usually 4 boards of 1-1/2”. I use the 1 inch board to create standoffs. I break or cut the board into small 1” squares and put butyl tape on both sides. I like to stick up 2-3 of these standoffs to the outside 2x10. Usually that board is the only thing between the outside and inside. With three standoffs in place I cut a 8.75 x 14.5 piece of 1-1/2” foam board and stick it into the standoffs. Gives me a 1” gap then foam around it. If it’s 11 degrees outside, it’s 65 in the crawlspace.
There are lots of ranch style homes that were converted into two stories and where they meet the garage attic space is always a leaking nightmare that can only be ended with spray foam.
DIY spray foam with DAP System 600 2-part spray foam kit (aka Touch 'n Foam Professional). Still expensive, but probably less than paying a spray foam contractor.
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I’m a small crawlspace contractor in E Tennessee. I turn the lights of in mid-day and look for light coming in I use my flashlight on & off marking light areas with a big fat magic marker. Seal these. I can do most homes with 1 board of 1” foam board and usually 4 boards of 1-1/2”. I use the 1 inch board to create standoffs. I break or cut the board into small 1” squares and put butyl tape on both sides. I like to stick up 2-3 of these standoffs to the outside 2x10. Usually that board is the only thing between the outside and inside. With three standoffs in place I cut a 8.75 x 14.5 piece of 1-1/2” foam board and stick it into the standoffs. Gives me a 1” gap then foam around it. If it’s 11 degrees outside, it’s 65 in the crawlspace.
There are lots of ranch style homes that were converted into two stories and where they meet the garage attic space is always a leaking nightmare that can only be ended with spray foam.
DIY spray foam with DAP System 600 2-part spray foam kit (aka Touch 'n Foam Professional). Still expensive, but probably less than paying a spray foam contractor.
I did mine with 2” rigid foam and used canned to seal the edges. Takes a lot longer but costs a lot less.