Crowning

Crowning

crowning-29446

Crowning

Sierra Exif JPEG

Crowning

Sierra Exif JPEG

Crowning

crowning-64391

Crowning

Sierra Exif JPEG

Board edges are lower than the centers

crowning-6391

Crowning

Sierra Exif JPEG

Crowning

crowning-29443

Board centers are higher than the edges

Crowning-2150

Cupped floor sanded with high moisture crowned after drying out

crowning-29445

Crowning

crowning-29446 Sierra Exif JPEG Sierra Exif JPEG crowning-64391 Sierra Exif JPEG crowning-6391 Sierra Exif JPEG crowning-29443 Crowning-2150 crowning-29445

What you need to know

Crowning is a type of warp where the center of the affected boards are higher than its edges(convex). It normally occurs when a previously cupped floor is sanded before it has dried to its equilibrium moisture content. Excessive moisture conditions such as flooding, leaks, excessive moisture in crawl spaces and basements will often cause a floor to cup. If the high edges of the cupped floor

Industry Standards

The National Wood Flooring Association states the following on page 8 of the 2018 Technical Publication C200, Problems, Causes and Cures:

Crowning
DEFINITION: A convex or crowned appearance of individual boards with the center of the board higher than the edges. This can also be a type of warp.
CAUSES: …..

Technical Guidelines

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