Added to two walls, it was an all day effort but turned out well enough. They do help with sound which was an added benefit. We ran into about 5 dud tiles where the backing would not peel off or it would rip into the foam if we did manage to get it off- so account for that when purchasing. We puzzle pieced them together by cutting out the half bricks on the edges. It was a little difficult to line up but made it look better overall. Im going to go back an caulk where tiles meet to make it blend even more and hopefully make sure these things dont go anywhere.