03-05-2011, 08:58 PM
Les: The club that I belonged to had the same problem in more than one area of the layout. In our case it was due to temperature changes. Our benchwork was constructed from high density particle board (even the legs were cut from 11/4 inch particle board) and I believe that had something to do with the warping. As someone else mentioned, humidity could be an additional factor. Good luck. Jim K.