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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

4.7
104
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The product description reads R-5 but the specs say R-3 is the max value. Which is it?