Squares, pitch factors, tear-off, and shingle waste. Choose a project type below for a complete step-by-step guide with formulas, waste factors, productivity benchmarks, and pro tips.
Shingle replacement is measured in squares (1 square = 100 sq ft). Every component — tear-off, underlayment, ice and water shield, shingles, ridge cap, drip edge — is priced separately per square or per linear foot.
Flat roofing is priced by the square (100 sq ft) like pitched roofing, but the components are entirely different: membrane, insulation board, adhesive, flashings, and drainage. No pitch factor applies.