House Wrap Calculator — ft, rolls, cost
How to use this calculator
Enter wall dimensions — perimeter + height, single wall length × height, or direct area. Add gable ends and deduct door/window openings. Choose roll size, set horizontal and vertical overlap, and waste allowance. Results update instantly.
Seam tape — 2–3″ tape for all horizontal and vertical seams, ~165 ft per roll.
Fasteners — cap nails or cap staples, ~1 per ft² of wrap, 1000 per box.
Cost — per roll of wrap, tape, and fastener box.
Saved Calculations
| Time | Method | Net ft² | Rolls | Cost |
|---|
How to Calculate House Wrap
Measure the building perimeter and wall height to get gross wall area, add triangular gable end areas (½ × base × peak height), then subtract door (~20 ft² each) and window (~15 ft² each) openings. Apply an overlap factor (typically 6″ horizontal + 6″ vertical = ~10-15% extra) and waste allowance (10% typical).
Formulas
Gross area = perimeter × height + gable areas. Net area = gross − openings. Overlap factor ≈ 1 + (horizontal overlap / roll width) + (vertical overlap / roll length). Adjusted area = net × overlap factor × (1 + waste%). Rolls = adjusted area / roll coverage.
Roll Sizes
Common sizes: 3′×100′ (300 ft²), 5′×100′ (500 ft²), 9′×100′ (900 ft²), 9′×150′ (1,350 ft²), 10′×100′ (1,000 ft²). For standard 8′ walls, 9′ wide rolls provide full coverage with overlap at top and bottom.
FAQ
How much overlap? Minimum 6″ horizontal (shingle-lap), 6-12″ vertical seams per manufacturer specs. How many fasteners? Approximately 1 cap nail or cap staple per ft² of wrap. Space fasteners 12-18″ apart along studs. Do I need seam tape? Yes — tape all seams, tears, and penetrations with manufacturer-approved tape for a continuous air barrier.
