i love my board, but i put muslin on top. i don't have insulbrite on the bottom either. starting from the top mine is: good quality muslin, good wool blankets, then the wood. i had read that the wool was good because it absorbs the steam and allows it to go right through the fabric. but, i feel that the wool is too squishy and the muslin is too stretchy. so i want to redo the entire thing. and get it right this time from someone who has done it. inthe meantime, while i look for the insulbrite wide enough, i think i'll spray the top layer with water and maybe it will shrink in as it dries.
thanks for your help, tuesy.