An independent reference for building owners

Everything a commercial roof is made of

Systems, assemblies, costs and contracts, explained by the people who repair them. No sales pitch inside the guides.

Start with roof systems Read our methodology

Why this site exists

Most roofing content is a sales page

Written to book a job, not to answer the question. We write the answer first and let you decide what to do with it.

Every page is dated and sourced

Facts come from manufacturer documentation, published standards and government agencies, and we say when a page was last checked.

Nothing here is sponsored

No manufacturer, system or contractor pays to appear on this site, and no page is written to sell a particular product. Where we think an option is wrong for you, we say so.

Scope firstA price without a written scope is not a price. The work gets written down before the number

Drainage decidesHow long a low slope roof lasts turns more on where the water goes than on the material

Name the systemTPO, EPDM, PVC, modified bitumen, built up and metal age and fail differently. Yours changes every answer

Nothing to buyThese pages explain what you are being sold. Reading them commits you to nothing

About this reference

Written for the person who signs the invoice

A commercial roof is bought once or twice in a career, usually under pressure, usually from a bid that is hard to compare with the one next to it. The gap is not intelligence. It is vocabulary.

These guides give you the vocabulary. What a cover board does, why an overlay voids a warranty, what a square actually costs, which line items a cheap bid quietly leaves out.

Nothing here is written to sell you a roof. The transactional pages are marked as such and live in their own section, so the guides stay guides.

Read our methodology

The six pillars