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Weather Resistive Barrier Cheat Sheet A guide to advantages and differences between Pro Clima exterior membranes If you’ve spent your days thinking WRBs are just a required, code-minimum, flimsy sheets of No.15 Felt (per IBC 1404 or IRC 703.2), Grade D building paper (per ASTM D226), or spunbonded olefin housewrap; all with little dif … read more