A wood floor that fails rarely fails on fitting day. It fails months later: boards cupping in a spring heatwave, gaps opening the first winter the heating runs hard, a ridge lifting along the middle of a room. When a floor inspector is eventually called in, the finding is moisture more often than anything else, and the moisture was there, unmeasured, before the first board went down.
Wood is always negotiating with the room
Wood takes on and gives up moisture until it matches the air around it, swelling and shrinking as it goes. A board manufactured and warehoused at one humidity, delivered to a house at another, will change size after fitting unless it is given time to settle first. That settling is what acclimatisation means, boxes stored in the room where they will be fitted, in the conditions the house will actually live at, heating running as normal. The days quoted on the packaging are a starting point, not a ritual: what matters is that the wood's moisture content stops changing, which is why good fitters arrive with a moisture meter and not just a tape measure.
The building has to be dry first
Acclimatising wood in a wet building just teaches it the wrong lesson. Fresh screed and plaster release water for weeks, and screed can look and feel dry long before it is dry enough to seal under a wooden floor. This is the classic renovation failure: the programme slips, the floor goes in to hit a moving-in date, and the moisture rising out of the slab does the rest. Insist on a subfloor moisture reading before fitting, and ask for the figure, not a thumbs-up. A fitter who declines to measure is asking you to carry the risk.
What to do as the customer
Take delivery early enough for real acclimatisation, keep the house at normal living temperature before and after fitting rather than blasting heat to dry things quickly, and in the first year expect small seasonal movement, which is the wood doing its job. Large movement is the moisture debt being repaid.
When you compare flooring firms near you or request quotes, one question sorts the field: 'what moisture checks do you do before fitting?' The good answers are specific, and the vague answers are a forecast.
