This issue can either come from a moisture issue that is affecting the center of the planks or from sanding a floor that was cupped and still had moisture issues.
Crowning floor due humidty.
It usually happens after water is left standing on the wood or if the floor s exposed to high humidity over a long span.
This creates a concave u shape in the board.
Crowning is typically a problem that is a direct result of cupping.
Crowning is the opposite of cupping.
Crowning like buckling and peaking occurs when a floorboard is higher in the center than it is on the edges.
Crowning is characterized by wood that is raised in the center and dips down on the long edges of the planks.
In terms of your flooring excessive relative humidity can cause several issues.
Like cupping and buckling crowning is a defect a wood floor can develop when exposed to moisture.
Unfortunately it s also possible to cause crowning in an attempt to fix cupping.
The middle of the board is higher than the board s edges.
But dust mites can t exist in humidity below 50.
It most often occurs when a floor has been sanded too soon after cupping.
An example of cracking in hardwood floor due to high relative humidity.