Skip to content
Log in

Underlayment and Moisture Barrier Roll Calculator

Calculate rolls of underlayment or moisture barrier required for floor area and overlap.

Inputs

Project inputs

Range: 1–100,000 ft2

Use the measured field area where underlayment will be installed.

Range: 1–5,000 ft2

Use the selected product label/data sheet. Do not subtract overlaps again if published coverage already accounts for them.

Range: 0–40 %

Editable estimate only. Follow the exact underlayment instructions for seam overlap, taping, and moisture/vapor control.

Result

Published coverage purchased
600.00 ft2
Target coverage including allowance
580.80 ft2
Rolls to buy
6
Nominal coverage above floor area
72.00 ft2

How this is calculated

Target coverage including allowance
—

More calculators