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Building code references for restoration contractors.

All Calculators

Underlayment Calculator

Calculate synthetic or felt underlayment rolls for full roof deck coverage

Roof Area

Enter total roof surface area

Total Roof Area

SF

After slope factor if using measurement PDF

Waste Factor15%

SimpleNormalComplex

Underlayment Type

Synthetic Specifications

Roll Width4'

Roll Length250'

Coverage/Roll1000 SF

Overlap4"

Code Reference

Coverage Visualization

Enter roof area to calculate underlayment requirements