ASHRAE 90.1 requiring min R-20 for roofs?
ASHRAE 90.1 requiring min R-20 for roofs?
(OP)
Is ASHRAE requiring a R-20(min. 3.3" polyiso) for roofs.? When will it be effective in the codes?
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ASHRAE 90.1 requiring min R-20 for roofs?
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