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Residential Sheathing Square Edge R- 3 , 0.55-in x 4-ft x 8-ft Faced Polystyrene with Sound Barrier Board Insulation

STYROFOAM Residential Sheathing Square Edge R- 3 , 0.55-in x 4-ft x 8-ft Faced Polystyrene with Sound Barrier Board Insulation

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What is the PERM rating of this XPS with polyethylene facer product?


Hello, Jarrod - Thanks for your question about using DuPont™ Styrofoam™ Brand Residential Sheathing. This foam has a rating of 0.3 perms per inch based on ASTM E96. The thicker the foam, the lower the permeance. If this is the level you are trying to achieve, it will work well for your application.

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