Exterior calculator

House wrap

Weather-resistive-barrier roll count from wall perimeter, height, opening deductions and the net coverage of one roll.

Reviewed formula · v1.0.0

Project inputs

Enter field measurements. Imperial lengths take feet and inches. Unit conversion happens before the reviewed formula is applied.

Wall perimeterft + inTotal wall length being wrapped, including gables measured separately if neededftinWall heightft + inAverage wrap height to the eave or plateftinDoorscountDoor openings to deductWindowscountWindow openings to deductDoor deductionft²Editable area deducted per doorWindow deductionft²Editable area deducted per windowRoll coverageft²Net coverage of one roll after the labelled lap. A common 9×100 ft roll is 900 ft²Lap / waste%Allowance for laps, corners and cuts. 10% is a common planning figure on top of labelled net coverage

All values can be refined when you edit the estimate. This tool does not replace field verification or local requirements.

Calculated result

2rolls

Rolls to order

FormulaEXT-WRP-001

(perimeter × height − openings) × (1 + waste) ÷ roll coverage

1098 ft²

Net wall area

1207.8 ft²

Area including laps

Transparent cost view

Planning rates only. Pick a currency — badges, inputs, and totals follow. Material is a rate. Labour is hours × a planning hourly rate. Equipment and delivery are this-job amounts.

Material ratePlanning · per calculated unit · USDEquipmentPlanning · this job · USDDeliveryPlanning · this job · USDLabour hoursPlanning · this jobLabour ratePlanning · per hour · USDOverhead %%Contingency %%Markup %%Tax %%

Planning defaults are office figures, not a bid. US ready-mix in 2026 often lands around $125–165 per cubic yard delivered; place-and-finish commonly $2–4 per square foot. Replace every rate with a supplier or crew quote before you send the letter.

Indicative FX as of Aug 2026. Planning conversion, not a live bank rate.

Material costUSD 170

Labour (8 h)USD 280

Direct costUSD 560

Overhead + contingencyUSD 56.00

Markup + taxUSD 73.92

Estimated project totalUSD 690

View estimate Quote / invoice Add another item

Embed this calculator

<iframe src="https://construclytic.com/embed/house-wrap" title="House wrap" width="100%" height="820" loading="lazy" referrerpolicy="strict-origin-when-cross-origin" style="border:1px solid #d7e0da;border-radius:16px;background:#fff;"></iframe>

Paste on a contractor site or blog. The iframe is a planning takeoff, not a bid.

How this calculator works

A transparent house wrap takeoff.

Wall perimeter times height, minus door and window openings, then divided by net roll coverage after a visible lap allowance.

Worked example. Example: 140 ft of wall at 9 ft with two 21 ft² doors and eight 15 ft² windows is 1,098 ft² net. A 900 ft² roll with 10% waste rounds to 2 rolls.

1. Walk the perimeter that will actually receive wrap, including bump-outs.
2. Deduct the openings you will cut out, or raise waste if you wrap over them and cut later.
3. Enter the labelled net coverage of the roll you will buy, not the gross 9×100 face if the label already subtracted laps.

Need the broader workflow? Read the exterior planning guide.

Questions

Questions about house wrap

Is this a drainage-plane design?

No. It is a roll count. Tape, caps, window flashing and the WRB product stay with the wall spec.

Gables?

Add gable triangles as extra perimeter height or run the calculator twice. A rectangle under-counts a gable.

What is the formula ID?

This calculator publishes formula EXT-WRP-001, version 1.0.0. The ID stays on the result and on the estimate line.

Is this engineering advice?

No. Construclytic is a planning website, not a registered engineering or contracting firm. Field checks, codes and product data still sit with you.

Does Construclytic fetch live supplier prices?

No. Costs use the rate you enter. Construclytic does not fetch live supplier prices.