Where did you find felt covered styrofoam boards? My lumber company only had the normal type of styrofoam boards so ordered a piece of flannel to fit............no seams. Couldn't find the flannel with the grid on it my size.
I was afraid to screw my insulation boards so thought I'd glue them onto slats to the wall instead. Thought the weight of a quilt might make them split and/or break apart.