Hardwood acclimation is the step most DIY installers skip and the one that causes the most installation failures in the Pacific Northwest. Here's what it actually means and why it matters.
What Is Acclimation?
Wood expands when it absorbs moisture and contracts when it dries. Before hardwood flooring is installed, it needs to reach the same moisture content as the air inside the home where it will live. If it's installed wetter than the home's ambient conditions, it will shrink after installation — causing gaps between boards. If it's installed drier, it will expand — causing buckling.
How Long Does It Take?
In Eastside homes with typical HVAC conditions, solid hardwood typically needs 5–10 days of acclimation. Engineered hardwood is less sensitive and may need only 2–4 days. Acclimation timing changes significantly in summer (when interior humidity is lower) versus winter (when heating systems dry interior air). We assess and advise on acclimation timing as part of every hardwood project.
How to Acclimate Properly
Hardwood should be stored in the actual room where it will be installed, with the HVAC system running at normal occupancy conditions. Stacking the boards with spacers to allow airflow speeds the process. Storing hardwood in a garage or unheated space and then installing it in a conditioned room is not acclimation — it's a recipe for movement.
Ready for a Free Estimate?
Moss Bay Flooring Co. serves Kirkland, Bellevue, Redmond, Sammamish, and all of the Eastside. Every estimate is free, in-person, and includes a written quote.
📞 (425) 832-8584