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How much R-49 insulation for 1,200 sq ft of attic?

Answer
26 batts (48 sq ft coverage each)
Total area: 1,200 sq ftR-value: R-49Coverage per batt: 48 sq ft

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How We Calculated This

Batts = ceil(Total Sq Ft / 48)

1,200 sq ft / 48 sq ft per batt = 26 batts

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Calculated using verified formulas. Last updated March 2026.