I've noticed on new floor boards stocked in B & Q, Wickes etc have two cuts the whole length of the board (like tramlines) on what would be the back of the board. Any idea what the idea of this is? I was going to use boards to make a door but can't due to these lines.
the lines in the back of any wood are to reduce the risk of movement and allow a bit of wood that would otherwise be cupped and possibly split if you pin down to relax a bit
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