A wood floor is the one product in the showroom that keeps moving after it is sold. The National Wood Flooring Association’s installation guidelines, revised in 2025, spell out the conditions it needs, and each one changes what an ad or a quote can honestly promise.
The house has to be at living conditions first. The NWFA wants the jobsite’s heating and cooling system running for at least five days before flooring materials are delivered. For solid wood the general rule is relative humidity between 30% and 50% and a temperature between 60 and 80 degrees Fahrenheit. Propane heaters should be avoided before, during and after installation, which matters on a cold new-build site.
The other trades go first. Wood is not delivered or installed until every wet trade is finished: concrete, masonry, plastering, drywall, texturing, painting and power washing. On a remodel that puts flooring near the end of the schedule, so any delay upstream lands on your install date and, if nobody explained it, on your reviews.
Climate sets the target. Citing the USDA Forest Products Laboratory, the guide puts average wood moisture content at 8% for most of the country, 6% in the dry Southwest and 11% in damp, warm coastal areas. In some climates the ideal indoor humidity runs higher, 45% to 65%, or lower, 20% to 40%, and in our experience the higher range pushes humid coastal buyers toward engineered wood and plank.
The seasons show in the boards. The NWFA’s consumer advice says gaps and splits that appear and disappear with the seasons are normal, and that floors which gain moisture can cup. Every January, dry heated homes produce calls about gaps.
What that means for the marketing:
- No “installed this week” on wood. Promise a timeline instead: measure, moisture check, delivery, acclimation, install.
- Put the conditions on the quote and on the site, so the homeowner runs the system and finishes painting before delivery day.
- Quote holiday jobs early enough for the five days and the wet trades to fit, which in practice means October at the latest.
- Publish a page on winter gaps before January, and answer gap calls with an offer to come and look rather than a defense.
In our experience the companies that explain all this before the sale get fewer angry reviews, because the homeowner hears it from them first and not from a cupped board.