Carpet and cushion
The easiest removal and the one that most often reveals something. Carpet and pad lift quickly; the tack strip around the perimeter comes up with them, and the staples left in the deck have to come out rather than be flattened.
It is also where old pet damage shows itself. If moisture has been through the pad into the subfloor, we would far rather find it with the room empty than seal it under a new floor and have it find you later.


