Mayberry Smoker, 1/4" is too thin. Also, slate doesn't hold up well even with the feet. Mine was a 24" x 24" x either 5/8" or 3/4". even with using the feet it gave out in less than a year. Now I have 18"x18" x 1.1/2" bluestone and am hoping for the best.Definitely use the feet AND a stone.