How To Find A Roof Leak With Spray Foam Insulation. Spray foam insulation, also known as spray polyurethane foam insulation, is a product that is applied with a sprayer that mixes two liquids. The underside of your roof may be obscured by insulation, and that’s actually helpful for finding the roof leak.
(spray foam insulation applied to roof decking for attic encapsulation) q: 3 it creates a dry, clean, useful loft space. Your metal roof expands when it’s hot and contracts when it’s cold.
After the leak has been repaired, the open cell spray foam will dry fairly quickly.
If the leak is severe enough, it can cause sagging. It’s not coming from above the roof and it’s not some new moisture source resulting from the spray foam. Spray foam acts as a barrier against air leaks by sealing gaps and cracks. Most of the time, extreme heat shifts cause that leak.