The PNW reality: why floors behave differently in Seattle-area homes
Wood is hygroscopic — it gains and releases moisture as relative humidity shifts. In the Pacific Northwest, seasonal swings matter. Indoors, humidity depends on heating, ventilation, and whether the home runs dehumidification or air conditioning. Some movement is normal; problems happen when the system is chosen without planning for that movement.
Movement can show up as small seasonal gaps, subtle changes at transitions, or minor cupping if moisture is introduced from below. The best floors are planned to handle seasonal shifts without drama: correct acclimation, correct expansion allowances, correct underlayment/adhesive choice, and correct subfloor prep.
Wide plank hardwood is one of the most popular design choices in Kirkland, Bellevue, and Redmond remodels. Wider boards are stunning — and they magnify moisture behavior. A stable engineered core and correct installation method become more critical.