Roofing Ice and Water Shield Calculator
Estimate ice-and-water membrane area, full rolls, purchased coverage and material cost for eaves and valleys using editable widths, overlaps and product coverage.
Default project preview
4 rolls
Protected eave area
504 ft²
Protected valley area
72 ft²
Base membrane area
576 ft²
Purchased coverage
780 ft²
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Base area = protected eave length × eave count × membrane width + valley length × valley width. Overlap and waste percentages are added before rolls are rounded up.
FAQ
Roofing Ice and Water Shield Calculator questions
Does every roof require the same membrane width?+
No. Required protection depends on roof design, climate, product instructions and local requirements.
Why include overlap separately from waste?+
Overlap is consumed in installed laps, while waste covers cuts, starts, ends and damaged material.
Does this include underlayment for the full roof?+
No. It estimates only the entered eave and valley protection zones.