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Building Science

How does spray foam seal my building?

Spray polyurethane insulation is sprayed on as a liquid which reacts and expands in place. This expansion action also seals all of the cracks and crevasses in your wall's exterior sheathing. The result is that air can no longer slip in: your building will be less drafty and more comfortable. Air leakage can also introduce moisture into the wall cavity, resulting in wet insulation and mold and mildew. With the sealing effects of spray foam insulation; this will not be a concern.


Bonus room sample.pdf

After re-insulating my attic with Icynene, my home is significantly cooler in summer & warmer in winter.
Bob,