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is not impermeable, it could allow water or moisture to enter the wall assembly, which could then cause damage or deterioration of the building elements." As of 2014-08-21, the domain airkretecanada.com appears to be abandoned.;Polyisocyanurate: Typically R-5.6 (RSI-0.99) or slightly better after stabilization - higher values (at least R-7, or RSI-1.23) in stabilized boards. Less flammable than polyurethane.;Phenolic injection foam: Such as Tripolymer R-5.1 per inch (ASTM-C-177). Known for its air sealing

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