Modified Bitumen Calculator
Sheet rolls, adhesive, and cap sheet for mod-bit roofing.
Inputs
%
Results
Actual Roof Area (sqft)
3,003
Base Sheet Rolls38
Cap Sheet Rolls38
Total Rolls76
Primer (gallons)14
Flashing Rolls7
Mastic/Sealant Tubes12
Est. Material Cost ($)$4,155
Roof Squares33.03
Penetration Flashing Sqft16%
How to Use This Calculator
- Enter roof footprint (sqft), pitch, perimeter (LF), and number of penetrations.
- Set waste factor (%) (typically 10-15% for modified bitumen).
- Review calculated roof area, base sheet rolls, cap sheet rolls, and flashings.
- Add primer, adhesive, and flashing quantities for penetrations and perimeter terminations.
- Torch-applied modified bitumen requires certified installers -- verify contractor qualifications.
Ad Placeholder
Related Calculators
Built-Up Roofing Calculator
Ply count, bitumen, and surfacing for BUR system.
TPO Roofing Calculator
Membrane area, adhesive, and accessories for TPO system.
Roof Insulation Calculator
Insulation R-value and thickness from energy code.
Roof Warranty Comparison Calculator
Total cost of ownership across roofing warranty types.
Ad Placeholder