RoofingCalculatorHQ Open Data — Creative Commons Attribution 4.0 International (CC BY 4.0)

You are free to:
  Share — copy and redistribute the material in any medium or format
  Adapt — remix, transform, and build upon the material for any purpose, even commercially

Under the following terms:
  Attribution — You must give appropriate credit to "RoofingCalculatorHQ"
  with a link to https://roofingcalculatorhq.com/data/, provide a link to
  the license, and indicate if changes were made. You may do so in any
  reasonable manner, but not in any way that suggests the licensor
  endorses you or your use.

Full license text: https://creativecommons.org/licenses/by/4.0/legalcode
Human-readable summary: https://creativecommons.org/licenses/by/4.0/

Source citations: each row in every CSV includes a `source` or
`source_standard` column pointing back to the underlying public record
(NRCA, NFRC, Master Builders Australia, Canadian Roofing Contractors
Association, ZVDH, CAPEB, ANDIMAT, Confartigianato, Eigen Huis, ABRAS,
SMACNA, AS/NZS 3500.3, etc.). RoofingCalculatorHQ is the compiler and
curator; the underlying figures remain attributable to their original
publishers.

Last updated: 2026-04-30