Underlayment Calculator
Calculate rolls of underlayment and feet of drip edge for a roof installation.
Typical: 10% side-lap per NRCA. Steep slopes may require more.
Perimeter length of eaves and rakes receiving drip edge
Rolls of Underlayment23rolls
Drip Edge200linear ft
Roll size assumed: 36-inch wide, 400 sq ft per roll (standard roofing felt). For synthetic underlayment, check manufacturer specs for actual roll coverage.