House Wrap Calculator

Calculate house wrap (weather barrier) for exterior walls. Enter wall dimensions and openings for total rolls needed.

🏠 House Wrap Calculator

Results

Net Wall Area1,278.00 sq ft
Total (+10% overlap)1,405.80 sq ft
Rolls (9Γ—100 ft)2 rolls

πŸ’‘ How to Calculate House Wrap

House wrap is a weather-resistant barrier (WRB) installed over exterior sheathing before siding. Calculate net wall area by subtracting door and window openings from gross wall area. Add 10% for overlaps β€” horizontal laps should be 6 inches, vertical laps 12 inches.

Standard rolls are 9 ft Γ— 100 ft (900 sq ft) or 9 ft Γ— 150 ft (1,350 sq ft). Install from bottom up so upper courses overlap lower courses. Tape all seams and penetrations with manufacturer-recommended tape.

A home with 4 walls averaging 40 ft Γ— 9 ft, 2 doors, and 8 windows: gross area = 1,440 sq ft minus 162 sq ft openings = 1,278 sq ft + 10% = 1,406 sq ft β‰ˆ 2 rolls.

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