How to Replace the Sewer Pipe Above a Basement Floor

Cleanout

• 1

  Wipe one end of the replacement pipe with a cloth. Place a Y-fitting over the opening to test the fit. Ensure that the fitting is the same diameter as the pipe.

• 2

  Twist the Y-fitting to bond tightly with the pipe. Mark the spot on the pipe where the fitting and the pipe contact.

• 3

  Remove the fitting. Smear a layer of primer around the edge of the pipe with the swab that comes attached to the primer can's cap. Start from the mark and work inward.

• 4

  Apply a generous layer of solvent that covers the primer. Brush primer and solvent on the Y-fitting. Twist the Y-fitting onto the pipe. Ensure that it lies snugly against the pipe.

• 5

  Thread a cleanout plug over the Y-fitting in a clockwise motion. Ensure that the plug fits snugly onto the fitting without being difficult to loosen.

Cutting

• 6

  Cut the old pipe about 3 or 4 inches from where it enters the first story with a PVC-pipe saw. Ensure that you make straight, not angled, cuts. Remove any burrs on the pipe with a utility knife.

• 7

  Cut the bottom of the pipe 3 or 4 inches above where it runs below the surface of the basement floor.

• 8

  Avoid cutting the new pipe to the exact length of the opening. Measure the opening left by the removal of the old pipe. Cut the new pipe about 5 inches longer than the opening. This leaves you about 2 1/2 inches on each end to fit over the existing pipe.

Bond

• 9

  Place an appropriate size connection coupling over the replacement pipe at the end without the fitting. Place the replacement pipe over the top opening of the old pipe. Fit tightly and make marks where the coupling meets the two pipes. Remove the new pipe and coupling.

• 10

  Apply primer at the marks. Brush solvent over the primer. Set the coupling over the replacement pipe. Place the new pipe over the old pipe and twist for a firm fit.

• 11

  Dry fit the Y-fitting and the bottom of the old pipe. Make marks at the contact point. Apply primer and solvent to the bottom of the Y-fitting. Repeat for the old pipe at the marks. Place the Y-fitting over the old pipe. Twist for a tight fit.

• 12

  Wrap a plastic strap around the pipe. Connect it to the wall or a stud with screws. Place straps every 4 feet.