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R- 21 Attic Wall Unfaced Reflective Roll Insulation 33.3-sq ft ( 16-in W x 25-ft L ) Individual pack

Reflectix R- 21 Attic Wall Unfaced Reflective Roll Insulation 33.3-sq ft ( 16-in W x 25-ft L ) Individual pack

4.8
415
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2x4 walls, apply this over interior, drywall over that, will my r value same as normal fiber glass insulation at r13? Heat and cool area the same?


Seems to me from reading all of Reflectix answers you would also have to add Reflectix in between each wall joist at 2" in depth then apply over joist then your drywall. In order to make a sealed air space between interior and exterior of building. When you do that suppose to have an R value of 21.

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without an air space it would be an R1.1

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