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R- 21 Attic Wall Unfaced Reflective Roll Insulation 400-sq ft ( 48-in W x 100-ft L ) Individual pack

Reflectix R- 21 Attic Wall Unfaced Reflective Roll Insulation 400-sq ft ( 48-in W x 100-ft L ) Individual pack

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what application gives an r-21 value?


crawl space application with two trapped air spaces of 3" plus. One layer stapled to the middle of the floor joist and another layer stapled to the bottom of the floor joist.

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