How to remove old drain pipes in the wall
If you are removing a sink in the kitchen , bathroom or laundry room, you will need to disconnect the drain from the waste pipe. Unless you are planning a new sink, you will probably want to remove it and patch the wall. When you open up the wall, you will probably find that the stub has vertical connections to the basement drain and the roof. If you can find these pipes in the attic or crawl space, it is possible to cut them off and remove them. If you cannot find them, it is probably better to seal the pipes behind the wall. Locate the studs on either side of the drain stub you want to remove with a stud finder. Using a box cutter and a wall saw, cut a rectangular piece of drywall that extends at least to the sides of these studs and about three feet above the drain stub to the floor. Cut through the drywall in the middle of the stud faces so that you have access to wood to which you can attach the new drywall. Using a hacksaw, cut the PVC pipe anywhere in the wall that will a...