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Do I need a thermal barrier?

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In an occupied space, you need a thermal barrier adjacent to either low density or medium density foam - this could be ½ inch gypsum board, or from the code prescribed list in 2603.4, depending on the spray foam section of your local code. See each Icynene spray foam product to check which paint-on or spray-on thermal barriers can be used.

If the space is unoccupied, you don't need a thermal barrier.

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