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Old 10-11-11, 08:46 PM   #7
S-F
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You just order a two part spray foam kit, then cut pieces of rigid insulation to within an inch or so of the size you your joist bays ( big long strips for the two sides of the house with no joist hangers and so on) tack them in, cover yourself in a biohazard suit and spray everything that even remotely looks like a crack or seam. EVERYTHING. Even though you think all of the area you are trying to seal is comprised of a facing band joist and vertical floor joists don't neglect to remember that air leaks around the top and bottom of the floor joists so foam those joints into the space further by 6 + inches. It's not too hard but spray foam is a petrochemical and thus is disgusting so get a respirator and a tyvek suit. Then take a vacation for a month or so somewhere biologically wholesome while you recover and your house outgasses.
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