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You can buy a froth pak, which is two part urethane foam. You need to wear a respirator, a really good one with the right cartridges. They work best for airsealing rather than trying to do the thermal insulation as foam. the material costs is typically equal to or a little more than having it done.
What is your assembly?
Example: asphalt shingle, plywood sheathing, 2x12 rafters, drywall
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