After renovating my basement room to create an HT/music room, I have left over tiles from the drop ceiling that was originally there. They are 5/8inch thick rigid fibreglass and a box of 12 2'x4'x5/8" is pretty inexpensive, if I need more. My question is this. As they look just like the Owens Corning rigid fibreglass series 700 (albeit thinner), could I just glue several panels together to reach the desired thickness for bass traps, and also use them on the walls (also layered, just not as thick) as acoustic treatment? Thanks. Oh, and if I can use them on the walls, should I glue them to the wall or hang them like pictures with wires, a bit away from the walls?