Crowning is effectively the opposite of cupping, resulting in a convex profile across the width of the board. While less common than cupping, crowning is almost always the result of improper installation or maintenance practices, specifically the premature sanding of a floor that was already experiencing moisture-related cupping. When a homeowner or an inexperienced contractor sands a cupped floor, they are removing the high edges. As the wood eventually loses the excess moisture and returns to a natural moisture content, those sanded edges shrink, leaving the center of the board as the highest point. This creates a permanent, unsightly, and difficult-to-repair crown in the floor. Beyond improper sanding, crowning can also be caused by excessive moisture on the surface of the floor, such as improper cleaning methods that leave water sitting on the planks for extended periods. This causes the top fibers to expand, effectively pushing the center of the board upward. To prevent this, always prioritize identifying the root cause of any vertical displacement in your flooring. If you see signs of board deformation, stop all cleaning and contact a professional flooring technician. Professional evaluation is required to determine if the moisture issue is localized or structural, as persistent moisture can also compromise subfloor integrity and lead to secondary issues like mold or rot.
Key considerations
- what is crowning in hardwood floors
- hardwood floor crowning causes
- fixing crowned floors
- hardwood-sanding
- hardwood-refinishing
- hardwood-damage