After trial and error and tedious attempts to remove the strip so I could reuse it, two rollers was enough for one door. It's too thick to fit between the door and wall like you think it should. I couldn't close the door when I lined up the sides and top. Pads on both sides at the same time made it possible to close the door with a little effort. and then the foam protruded very ugly between the cracks. I ended up sheathing the door in a different way. I'm not sure if it's as effective as being wedged between a wall and a door, but I'm sure it's better than nothing. By the way, I got that to muffle the noise from the hall.
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