I'm in the process of changing out my present design wall to one using foam board. I had the lumber company cut the foam to the size I need. Had to get 2 - 4x8 sheets of it to fit the area I wanted. Also ordered the flannel cover to go over it to fit the entire size too. Anyway, I also didn't want to damage the chipboard walls I have down here in the basement so will nail thin slats around the circumfrance (spelling is wrong), then found some tube type glue made for foam and will stick the foam board to the slats using this glue. I also picked up some double-sided tape to put the 2 pieces together as my area will end up at 96w x 70h when finished. I'll tack on some trim around the edge to cover the flannel edge and keep it from slipping. I'm thinking I might use some of my 505 spray to spray the flannel onto the foam depending on whether it says it won't melt the foam board. Have lots of the 505 spray on hand.