2%
max moisture difference for wide plank
We Test Before We Install
Cupping, gaps and buckling usually start as moisture problems, not bad boards. We read the slab or subfloor and the flooring itself, and we do not install until the numbers fall within NWFA limits: a 2% difference for planks 3 inches and wider, 4% for narrower strip flooring. You get the readings in writing, so you have a record if a warranty question ever comes up.
