My LQS gals made these for their classroom. However I was told to be sure to drill holes in the plywood about every 4 - 6 inches to allow steam to go through. Assuming you use steam in your iron. They were burning out their Rowenta irons after a couple months and couldn't figure out why. Somehow the steam backs up or something and will damage the iron. If you look at a regular board it does have holes in the surface. So DH drilled holes in mine and so far I haven't had a problem.