FREE TOOL · Tarp Calculator
Roof Tarp Size Calculator
Enter the damaged area and the slope and see how large a tarp you need, how much overlap to add and how many battens to plan for.
Four quick steps.
- 01
Measure the damage
Length and width of the damaged area in feet, from the ground or a safe position.
- 02
Pick the slope
Steeper roofs need more tarp for the same area.
- 03
Add overlap
More overlap is better in high wind.
- 04
Read the result
See tarp size, battens and fasteners to plan for.
About this tool.
Can I install the tarp myself?
We recommend a professional. Roofs are dangerous, especially damaged ones.
Why add overlap?
Overlap lets water shed without running under the edges, and gives you fastening margin.
Related services.
A-01Emergency ResponseEmergency Roof TarpingWhen a storm opens your roof, a properly secured tarp keeps water out of the house until the permanent repair can be done.Stage 1: Stop the waterA-12Emergency ResponseTarp Checks and MaintenanceA tarp that was tight last week may be flapping today.Stage 1: Stop the water
A-03Emergency ResponseEmergency Board-UpWhen a tree, fire or high wind leaves a hole in the roof deck, solid board-up and a covering membrane make the structure weather-tight again.Stage 1: Stop the waterStorm hit your roof? Call before the next rain.
Tell us what happened and where you see water. We will explain the safest next step and how we can cover and repair the roof.