House Wrap Calculator — m, rolls, cost
How to use this calculator
Enter wall dimensions — perimeter + height, single wall, or direct area in m². Add gable ends and deduct door/window openings. Choose roll size, overlap settings, and waste allowance. Results update instantly.
Seam tape — 50-75 mm tape for all horizontal and vertical seams, ~55 m per roll.
Fasteners — cap nails or cap staples, ~10 per m² of wrap, 1000 per box.
Cost — per roll of wrap, tape, and fastener box. Select currency below.
Saved Calculations
| Time | Method | Net m² | Rolls | Cost |
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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 (~1.86 m² each) and window (~1.39 m² each) openings. Apply an overlap factor (typically 15 cm horizontal + 15 cm vertical) 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 metric sizes: 1.5 m × 50 m (75 m²), 2.8 m × 50 m (140 m²), 3.0 m × 50 m (150 m²). For standard 2.4 m walls, 2.8 m or 3.0 m wide rolls provide full-height coverage with overlap.
FAQ
How much overlap? Minimum 15 cm horizontal (shingle-lap), 15-30 cm vertical seams per manufacturer specifications. How many fasteners? Approximately 10 cap nails or cap staples per m² of wrap. Do I need seam tape? Yes — tape all seams, tears, and penetrations with manufacturer-approved tape for a continuous air/wind barrier.
