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Can You Put R21 In 24 Wall

Fiberglass and rock wool batts—2×4 walls can hold R-13 or R-15 batts; 2×6 walls can have R-19 or R-21 products. R-19 to R-21 is generally considered a well-insulated exterior wall. Achieving an R-21 rating in a 2×4 wall is simpler when the wall is first being constructed so you don’t…