House Wrap Calculator
House wrap covers your home's exterior sheathing before siding goes on. Enter your gross wall area and roll size to estimate how many rolls to buy.
Wall area & roll size
Rolls needed
- Area with overlap
- 0 sq ft
How house wrap rolls are estimated
House wrap is sold in large rolls, commonly covering around 900 sq ft. Installers overlap seams by several inches, so a small waste allowance (typically 9%) is added before dividing by roll coverage and rounding up.
This is a planning estimate
Frequently asked questions
How much house wrap do I need?
Take your gross wall area, add a waste allowance for seam overlap (commonly 9%), then divide by your roll’s coverage and round up.
Does house wrap go under or over sheathing?
House wrap installs over the exterior sheathing and under the siding, acting as a water-resistive barrier — follow your manufacturer’s installation instructions.
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