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- 1). Cut into the sewer line at the appropriate place and glue in a "reducing" coupling (sewer line generally has a 3-inch diameter and vent line generally a 1 1/2-inch diameter). Make sure the coupling is pointing up, or in the direction of the stud wall where you will insert the vertical sewer vent. If you are connecting into an existing vent line, make sure the coupling is pointed in the existing line's direction.
- 2). Work your way, cutting the new vent line and connecting couplings as needed, until you either meet the existing vent line or the stud wall where you will install the vertical vent line. Either connect to the existing vent line or drill holes in the stud frame (making sure all holes line up with each other) until you reach the roof.
- 3). Mark the inside of the roof where the vent pipe will go through, as an elliptical hole. Cut the hole out with a reciprocating saw, and push the vent pipe through. (Check with permit office to see how much vent should be sticking through the roof.)
- 4). Climb on the roof and place a roof shield down over the vent, slipping the shield's flat metal base under the shingles on the upside of the vent pipe. Lift those shingles and nail the shield to the roof (two or three nails will suffice) before resting the shingles down over the shield. Don't nail the shield below the vent-pipe hole, as this may cause leaking. Install new shingles on each side of the shield's vent-pipe hole.
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