Editorial policy

Who writes the content?

Every guide and calculator page is written and maintained by the ProofGrit Editorial Team. We publish under the team name rather than individual names, and we do not list reviewers, credentials or endorsements. ProofGrit is construction materials testing software for small US labs, so the people we write for are lab managers, field technicians and reviewers who need a plain explanation they can check.

How is content researched?

We start from information that is publicly available: the titles and scope summaries that standards publishers such as ASTM International and AASHTO show on their websites, public pages from the American Concrete Institute and AASHTO re:source, and public guidance from the Federal Highway Administration and state departments of transportation. We do not reproduce the standards themselves, and we never claim a source says something unless we have read it there.

We only state specific technical numbers, such as formulas, rammer masses or temperature ranges, when we have verified them for publication. Everything else is described in general terms with a reminder to follow the current standard and the project specifications. Each guide ends with a sources section listing the pages we checked. Before a link is published, we open it and confirm it loads; if a deep link cannot be confirmed, we link to the organization's home page instead.

How are formulas and worked examples checked?

Every calculation on this site lives in one shared calculation library. The free calculators, the worked examples in the guides and the ProofGrit app all import the same functions, so a number on a guide page is produced by code, not typed by hand. The library is covered by automated tests that check each formula against known results, including rounding rules, before any change is published. If a formula changes, its tests change with it.

How often are pages reviewed?

Each guide and calculator page shows a “Last reviewed” date. We review published pages at least once a year, and sooner when a standard is revised, when a reader reports a problem, or when we change a calculation. The date changes only when the content actually changes, so it reflects the last real update rather than the last time the site was rebuilt.

What are the limits of this content?

Our guides are plain-English summaries. They do not replace the current edition of a standard, a project specification, an engineer's judgment or your lab's written procedures. The calculators show arithmetic; acceptance decisions belong to the people the project names for them.

How do I report an error?

Email support@proofgrit.com with the page address and what you think is wrong. Include the standard edition or source if you have one. We read every report, correct confirmed errors promptly, update the page's review date, and add or fix tests when the problem was in a calculation. You can also use the contact form.

Are there sponsors or affiliations?

No. We do not accept payment for content and we have no affiliation with equipment manufacturers or standards bodies. When a brand or standard is named, it is only as an example or a reference. See the standards index for every standard we cover, and the site map for every page.