FREE TOOL · PUBLISHED INDUSTRY LIMITS

Know before you sand.

Subfloor and flooring moisture, slab readings, and the conditions in the room — checked against the published limits and written down with the date. Most callbacks start on a day when the floor looked fine.

Works with no FloorForge hardware. Every limit here is the industry's, not ours — NWFA installation guidance and the named ASTM test methods — and each one is printed beside the reading it judged so you can check it. FloorForge certifies nothing, and your flooring manufacturer's specification governs where it differs.

The readings

SUBFLOOR

SUBFLOOR MC

FLOORING MC

FACE WIDTH

The allowable difference is not the same for both: 3 inches is where the published guidance changes.

JOBSITE TEMP

°F

JOBSITE RH

Normal living conditions are 60–80 °F and 30–50% RH for most areas.

Nothing over a published limit

This is a record of what you measured, not a certification that the floor is ready.

Each reading, the published limit it was measured against, and the document that limit comes from
Check	Reading	Published limit	Result
Subfloor vs flooring moisture (strip, under 3 in.) 9% subfloor − 7% flooring = +2% Limit: subfloor no more than 4% above flooring · Within limit Within the published differential for this width. Source: NWFA Installation Guidelines — solid strip under 3 in.: subfloor no more than 4% above the flooring; solid plank 3 in. and wider: no more than 2%.
Flooring moisture content 7% Limit: no universal target — regional · Not scored Deliberately not scored. Acceptable moisture content depends on the equilibrium moisture content where the floor lives, so a pass/fail here would be invented. Compare against your area's average and the manufacturer's specification. Source: NWFA — acceptable wood moisture content is regional: flooring should be within about 4% of the average environmental conditions for the area, so no single target percentage is correct everywhere.
Jobsite conditions 70 °F, 40% RH Limit: 60–80 °F, 30–50% RH · Within limit Normal living conditions, as the guidelines ask for. Source: NWFA Installation Guidelines — acclimate and install at normal living conditions, 60–80 °F and 30–50% relative humidity for most areas.

These are the industry's numbers, not FloorForge's. Every limit above comes from NWFA installation guidance or the named ASTM test method, and each one is printed beside the reading it judged so you can check it. FloorForge has measured none of them and certifies nothing. Where your flooring manufacturer's specification differs, the manufacturer's specification governs — and a passing reading here is a record of one moment at one location, not a warranty.