How Expanding Spray Foam Creates a Complete Seal

Spray foam insulation forms a complete, airtight seal through a unique combination of chemistry and physics. It begins as a two-part liquid mixture that, when sprayed, rapidly expands to more than 30 times its original volume. This powerful expansion forces the foam into every gap, crack, and creviceu2014no matter how small or oddly shaped. As it expands, it bonds tightly to wood, metal, and concrete, then cures into a solid, continuous layer. The result is a seamless barrier that acts as both insulation and an air sealu2014something traditional pre-cut materials simply canu2019t achieve.<br>

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