House Wrap Calculator

Enter your wall dimensions and get rolls of house wrap to order — wall area and a lap allowance handled for you, with a metric equivalent.

Inputs
ft ×
ft
ft
Doors0
Windows0
Results update as you type — no submit
ResultsLIVE
House wrap rolls
2 rolls
covers ≈ 1,400 sq ft wall (130.1 m²)
Wall area1,400 sq ft (130.1 m²)
Roll size9×100 ft · 900 sq ft
Formula
wall = 1,400 sq ft × 1.1 = 1,540 sq ft
rolls = ceil(1,540 ÷ 900) = 2
Wrap runs continuously over the whole wall — window and door openings are cut out afterward, so they are NOT deducted here. Seam tape and cap fasteners are separate items.
Diagram — wall elevationNTS
40 ft10 ft1,400 SQ FT · NO DEDUCTWALL ELEVATION · WRAP OVER OPENINGS
MeasureShedmeasureshed.com/calculator/house-wrap-calculator
House wrap — material listUNITS: FT · SCALE: NTS
Inputs
Footprint40 ft × 30 ft
Wall height10 ft
Roll size9×100 ft (900 sq ft)
Waste+10%
Results
House wrap rolls2 rolls
Wall area1,400 sq ft
Diagram — wall elevationNTS
40 ft10 ft1,400 SQ FT · NO DEDUCTWALL ELEVATION · WRAP OVER OPENINGS
Shopping list
☐ 2 rolls house wrap (9×100 ft)
☐ ~2 rolls seam tape + cap fasteners
Formula
wall = 1,400 sq ft × 1.1 laps = 1,540 sq ft
rolls = ceil(1,540 ÷ 900) = 2
Estimates for planning only — verify before purchaseSHEET 1 OF 1
How it works

House wrap is the weather-resistive barrier that goes on the sheathing before the siding. It rolls out horizontally around the building, and sizing it is a matter of wall area divided by roll coverage.

The wall area is the perimeter of the house times the wall height. A `40` by `30` foot house has a `140`-foot perimeter, so at `10` feet tall that is `1,400` square feet to cover. Unlike siding, you do not deduct the windows and doors: wrap is run continuously across the whole wall and the openings are cut out afterward, then taped. Running it long and cutting back is faster and gives a better seal than piecing it around each opening.

Roll coverage depends on the size you buy. The standard roll is `9` feet tall by `100` feet long, which is `900` square feet — one roll wraps a full story around a small house. There are also `3`-foot rolls at `300` square feet for tight spots and taller `150`-foot rolls at `1,350` square feet. The calculator adds a small allowance for the vertical and horizontal laps — usually `6` inches at seams — then rounds up to whole rolls, since you cannot buy part of one.

Seam tape and cap fasteners are separate items. A rule of thumb is one roll of seam tape per roll of wrap, plus a bucket of cap nails or staples; this tool sizes the wrap itself.

Worked example
House `40 ft` × `30 ft` · wall height `10 ft` · roll `900 sq ft` · `+10%` waste
wall area = `140 ft` perimeter × `10 ft` = `1,400 sq ft`
with laps = `1,400 × 1.10` = `1,540 sq ft`
rolls = `1,540 ÷ 900` = `1.7` → round up to `2` rolls
Questions from the wall
The common size is 9 feet by 100 feet, which covers 900 square feet. Narrow 3-foot rolls cover 300 square feet and are handy around openings, while 9-by-150-foot rolls cover 1,350 square feet for bigger jobs.
SOURCES — DuPont Tyvek HomeWrap product data · 9×100 ft roll = 900 sq ft
Estimates for planning only — verify before purchase
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