Terms of Use

The basic terms for using this site, in plain language.

These calculators are provided free of charge as a planning aid. By using them you accept that they produce theoretical geometry and material estimates, not an engineering design, a code-compliance determination or a guarantee of purchase accuracy.

Use and verification

You are responsible for verifying every result before you order materials or build. Measurements, pitches and coverage figures should be confirmed against your actual roof and the products you buy. Treat default waste and coverage values as editable planning examples, not fixed truths.

As-is, no warranty

The site is provided as-is, without warranties of any kind. To the extent permitted by law, the operator is not liable for losses arising from reliance on the results. If a result appears wrong, please report it through the contact page.

This wording is a plain-language summary for a planning tool. It is not a lawyer-reviewed policy and does not assert compliance with the laws of any particular state; a production deployment should have its terms reviewed for its jurisdiction.