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Ice & Water Shield Calculator

Estimate how many rolls of self-adhered ice & water shield membrane you need for your roof eaves.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
49.21 ft3 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Ice & water shield rolls needed

1 rolls

Check your inputs

Required coverage width and whether ice & water shield is code-mandated in your area both depend on local climate zone rules — check your local building code before finalizing coverage width.

Coverage area needed
162.33 sq ft

For the dimensions entered, expect a ice & water shield rolls needed of 1. Note that total eave length sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Moderate confidence — sound arithmetic, but allow for the variation any real site introduces. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • A standard self-adhered ice & water shield roll (36 in wide) covers approximately 200 sq ft; area = eave length x membrane width

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Do all climates require ice & water shield?
It's most commonly required by code in colder climates prone to ice dams, where meltwater can back up under shingles at the eave — check your local building code, since requirements (and required coverage width) vary by climate zone.
Does this cover valleys too?
No — this estimates eave coverage only. Roof valleys are also commonly required to have ice & water shield and should be measured and estimated separately by valley length.
Can I skip this if I already have gutters and good insulation?
Gutters and attic insulation/ventilation help prevent ice dams but don't eliminate the code requirement in many jurisdictions — check local code rather than assuming it's optional.