The Standards That Decide Whether a Floor Lasts

Every figure on these pages is traceable to a published standard or association guideline, cited at the bottom of each page.

Who publishes what

ASTM publishes the test methods, NWFA publishes the installation guidelines that reference them, and the EPA publishes the lead-safe rule that governs pre-1978 housing.

ASTM standards are test methods: how to measure moisture in a concrete slab, and what the result means. They describe procedure, not acceptance criteria for your floor.

NWFA guidelines translate those methods into practice — how many readings, what difference is acceptable, what conditions the jobsite has to hold.

The EPA rule is the only one of the three that carries the force of law, and it applies to housing built before 1978 regardless of what anyone's guidelines say.

Guidelines are not code, and still decide your warranty

None of these guidelines is building code, but manufacturers condition their material warranties on installation to industry standards.

That is where the consequence lands. A floor installed without documented moisture readings leaves the homeowner arguing a warranty claim about conditions nobody recorded.

It is also why we put readings in writing. It costs nothing when the work was done properly, and it is the only evidence that exists later.

Which of these applies to your project

Moisture standards apply to every installation; the lead-safe rule applies to sanding in pre-1978 housing; slab testing applies whenever flooring goes over concrete.

In the New Jersey towns we serve, the median share of pre-1978 housing is about 65%, so the lead-safe question comes up on most refinishing jobs rather than a few.

Slab testing comes up on basements, additions and converted garages — anywhere concrete is the substrate.