Sourcing Methodology
Our source choices depend on the question. A current installation requirement calls for a current technical document. A discontinued brand’s history may require archived company records and contemporary reporting.
Sources we prefer
- Primary documents: current manufacturer specifications, installation instructions, warranties, product approvals, safety data, corporate filings, and official announcements.
- Public and technical authorities: building departments, code bodies, government agencies, universities, and established standards or trade organizations.
- Independent reporting: reputable publications with named authors, dates, and evidence that readers can inspect.
- Historical records: archived websites, catalogs, legal records, and reporting published near the event.
How we handle manufacturer information
Manufacturers remain the best source for their current product dimensions, installation rules, warranty text, and contact channels. They are not neutral judges of comparative performance. We identify manufacturer claims and look for independent support when the claim affects a homeowner’s decision.
Cost research
Installed roofing costs vary by region, roof size and pitch, access, labor, tear-off, decking repairs, permits, ventilation, flashing, and material. We publish ranges to help with planning, explain the variables behind them, and encourage readers to compare detailed local estimates. A national range cannot price a specific roof.
Historical and discontinued products
Older pages need a clear line between past and present. We use past-tense language for former owners, products, warranties, certifications, and contact details. When we cannot verify a current successor or program, we say so rather than carrying old information forward.
Review archive data
Review counts and averages describe only the archived reviews published on RoofingCompare. They do not measure the full customer base or current product quality. We retain the original submission date and rating, display the text as an individual opinion, and explain that new reviews are closed.
Links and update dates
We link to supporting pages when a useful public source exists. Sources can move or change, so we also record a substantive update date on reviewed guides. If you find a broken source or a factual problem, follow our Corrections Policy.