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R- 21 Attic Wall Unfaced Reflective Roll Insulation 133.3-sq ft ( 16-in W x 100-ft L ) Individual pack

Reflectix R- 21 Attic Wall Unfaced Reflective Roll Insulation 133.3-sq ft ( 16-in W x 100-ft L ) Individual pack

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HOw do I get R-21 out if this with 16” between studs. I am confused by answers given. To get R-21 do you need to add another type of insulation to it?


R21 is only given in a crawl space application if that is not where you are applying it then you can not achieve an R-21

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