Exterior weather barrier estimator

House Wrap Calculator

Estimate house wrap or weather barrier rolls from exterior wall area, openings, roll coverage, overlap waste, seam tape allowance, and material cost. Use it between wall sheathing and siding takeoffs.

Units

Exterior wall area (ft²)Window and door openings (ft²)Coverage per roll (ft²)Overlap / waste (%)Tape allowance per wrap roll (ft)Tape roll length (ft)Cost per wrap roll ($)Cost per tape roll ($)

Wrap rolls to buy

Order area

Tape rolls

Rough cost

Weather barrier details control real performance

This calculator estimates rolls and tape only. Flashing sequence, window and door details, drainage plane, UV exposure, fasteners, laps, local code, and manufacturer instructions control the installation.

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Siding Calculator

Estimate siding squares and packages over the same wall area.

Plywood Sheathing Calculator

Estimate exterior sheathing sheets before the weather barrier.

Caulk Calculator

Estimate sealant tubes for exterior trim and penetrations.

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House wrap formula

Net wall area = exterior wall area - openings

Order area = net wall area × (1 + overlap/waste %)

Wrap rolls = order area ÷ roll coverage

Tape rolls = rounded rolls × tape allowance ÷ tape roll length

Sample takeoff

A house with 1,600 ft² of exterior wall, 180 ft² of openings, 15% overlap waste, and 900 ft² rolls needs about two rolls and one tape roll.A house with 149 m² of exterior wall, 17 m² of openings, 15% overlap waste, and 84 m² rolls needs about two rolls and one tape roll.

House Wrap Calculator FAQ

How do I calculate house wrap rolls?+

Subtract openings from exterior wall area, add overlap and waste, then divide by the coverage per roll.Subtract openings from exterior wall area, add overlap and waste, then divide by the coverage per roll.

Does this include window flashing tape?+

It includes a simple seam-tape allowance only. Window and door flashing tape should be calculated from the actual opening details and product instructions.It includes a simple seam-tape allowance only. Window and door flashing tape should be calculated from the actual opening details and product instructions.

Should openings be deducted?+

Large windows and doors can be deducted for a closer estimate, but many crews keep waste higher because wrap is cut around openings and laps.Large windows and doors can be deducted for a closer estimate, but many crews keep waste higher because wrap is cut around openings and laps.