Editorial policy

Each registered constant carries a label

The 23 registered calculator constants are each classified as sourced, derived or assumed. Sourced means we hold a saved copy of the cited page containing the words or table cells the figure comes from, with the date of that copy. Derived means its arithmetic is documented. Assumed means it is our own figure, with a disclosure sentence on the methodology page; the planning allowances built into the calculators are listed there too.

Calculator modules fetch those constants through a registry lookup that fails the build when an identifier has no entry. This mechanical check covers registry references; ordinary dates, form limits and explanatory examples in page copy are outside that registry and are not represented as sourced figures.

A hole is better than a guess

Where a figure cannot be sourced honestly, this site does not invent a plausible one. It either asks you for your own local number or states plainly that no defensible figure exists and explains why.

That shows on cost, where we publish no national installed-price average. It is also visible on slab moisture, where the two ASTM test methods publish no pass or fail limit for a coating, and on slip resistance, where the U.S. Access Board guide to the ADA Standards says the standards set no minimum because no consensus rating method exists.

Uncertainty is stated, not smoothed

The installed-cost tool shows a planning range beside its total, and each of the eleven tools names its own biggest swing factor on the page rather than in an appendix. Where a result excludes something material, the exclusions sit next to the number instead of in small print underneath.

Nothing here is a guarantee and the site does not use the vocabulary of guarantees. A calculator that returns a confident single figure from uncertain inputs is misrepresenting its own reliability, which is a subtler kind of wrong answer than an arithmetic error.

Manufacturer data outranks us, explicitly

Three things on this site defer entirely to the product you buy: the moisture limit, the cure and recoat windows, and the chemical resistance. In each case the tool asks for the manufacturer's number and works from that, because the manufacturer sets the limit and the manufacturer honours the warranty.

Where our own banding disagrees with a published build sheet, the build sheet is right. Our thicknesses are planning bands chosen so the resulting quantities are neither obviously short nor wasteful, and they are labelled as an assumption (block B2 on the methodology page).

No paid placement, no product ranking

There is no arrangement under which a manufacturer, distributor or contractor can influence what appears here. The site does not rank products, because we hold no independent test evidence and inventing a ranking would be exactly the authority-without-basis this policy exists to prevent.

Where a product characteristic genuinely decides an outcome — volume solids, pot life, the published moisture limit — the site tells you to read it off the data sheet, which is a verifiable document rather than an opinion.

How errors are handled

A corrected figure is changed where the figure is stored, so the pages displaying it change together. A figure whose cited source has changed is corrected and the change entered in the update log on the methodology page, rather than silently overwritten.

Each figure is stamped with a date half a year out from when it was read, and reaching that date obliges us to open the source again, or, for a figure labelled as our own assumption, to look again for a published value that could replace it. The contact page sets out what makes a correction quick to act on.

Who writes this

Andrew Flores, working alone, with AI assistance used for drafting and checking and never as a source. He answers for the epoxy floor estimates here, including the source checks and the corrections to coating quantities, surface preparation and cost assumptions. Each of the 13 sourced constants names its document and the date of the saved copy it was checked against, and the words or cells it rests on are reproduced on the methodology page. Derived and assumed constants are labelled separately rather than described as sourced.

Nathan Management is the publisher; the site is not written by a contractor, an engineer or a manufacturer.

Advertising and this page

No page on this site loads an advertising script or a consent-management platform. If that changes, this page and the privacy policy will be updated in the same deployment that introduces it. The policy describes what is being served, not what is planned.