Moisture readings every hardwood contractor should document
Hardwood callbacks are usually moisture callbacks. Cupping in month 3, gapping in month 9, crowning in year 2 — they trace back to readings that weren't captured or weren't acted on. Common industry practice expects three readings before installation. Documenting all three turns a callback into a discussion you can win.
Reading 1 — Subfloor moisture content
Recognized industry practice is that subfloor moisture content should not exceed roughly 12% for hardwood installation. Above that, hardwood is going to swell. You're inviting cupping.
Capture: a moisture meter reading at three locations per room (rough thirds of the floor), photographed with the meter visible on the substrate.
Reading 2 — Plank moisture content
The plank's MC needs to be within 2% of the subfloor's MC at installation. If subfloor is 10% and plank is 7%, the plank will absorb moisture and cup. If subfloor is 8% and plank is 11%, the plank will dry and gap.
Capture: pull a few planks at random from the delivery and meter them. Photograph the reading with the plank lot number visible.
Reading 3 — Temperature and relative humidity in the space
Job site should be acclimated to occupancy conditions before installation. Common targets are 65-75°F and 30-50% RH. If you install in 80% RH and the homeowner runs HVAC at 35% RH all winter, the floor is going to gap.
Capture: a thermo-hygrometer photograph showing both values. Date and timestamp visible.
Why undocumented readings cost you twice
When the callback comes — and it will, on some percentage of jobs — the undocumented installer is on the defense. The documented installer says 'I have the readings, here they are, this floor was installed to spec, the change in MC is environmental.' That's a callback that closes in 20 minutes instead of becoming a chargeback or a Yelp review.
The part nobody can see later
Most of what decides how this holds up gets covered before the job is over. Once it is closed in, the only record of how it went in is the photos taken while it was still open.
Supervisr's hardwood QA model works from common industry practice and the installation instructions that ship with the materials. It can review hardwood install photos and moisture documentation for subfloor flatness, acclimation conditions, fastener pattern, expansion gaps, and recorded MC readings. Upload your photos and the project's moisture history and you'll get a documented evaluation back in minutes.
For a homeowner, that record is a straightforward way to understand what you paid for. For a contractor, it is the milestone documentation that stands behind a workmanship warranty years later, long after the crew has moved on to the next job.
About Supervisr
Supervisr is an AI quality-assurance platform for residential hardwood and resilient flooring. It works from common industry practice and manufacturer installation instructions, and analyzes flooring photos and moisture documentation against those published references.
Contractors use Supervisr to tag moisture readings automatically and surface the projects that don't have them yet, so callbacks become 20-minute documentation discussions instead of week-long disputes.
Capture the three readings. Photograph them. Attach them to the project. Documenting the install in real time — and verifying it against the published NWFA and ASTM references — turns a callback into a discussion you can win.