Then....I went down to the basement. Blank design walls so no photos. I purchased 4 new foam insulation boards for design walls, this time 1 1/2" thick. The 1" that I had been using is too flexible since mine are leaning against the pipes across the basement ceiling, not mounted on a wall. I took the flannel off 4 design walls and washed it as well as a new piece of 108" wide flannel. I taped two 1" boards together to make 2" thick walls (two sets of them) and then started pinning the flannel back on all 6 of the foam boards. I now have 4 double design walls and 2 single walls in the basement and I carried one single wall up to my main floor studio. Wrestling those 4' x 7' sheets was exhausting!