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Cracked Vent Pipe



If you have a cracked plumbing vent pipe or drain you will notice a sewer smell.  Locate where the pipe is cracked.  Vent pipe is made from pvc, abs, copper or cast iron.  If it’s made from plastic (pvs or abs) or copper you can cut out the cracked section with a hacksaw.  If you have a cast iron pipe you will need an abrasive and iron cutting blade and a saw.  Inspect the pipe to determine how far the crack goes.  Cut 2-4 inches beyond the crack on either end of the pipe in order to remove the cracked part.  You may need to temporarily support the pipe where it has been cut, especially if it’s a cast iron pipe.  The hanging pipe will put stress on the adjacent fittings, which could lead to more cracks.  To support the pipes use steel strapping and anchor the pipe to a wall stud.

For abs or pvc pipe, be sure to replace with the same type of plastic.  For example if you have abs, be sure to replace with abs pipe.  Cut a new piece of pipe ¼ of an inch shorter than what was removed.  Using two fernco couplings, you can join the new pipe to the old pipe.  Slide the coupling completely over one pipe, either the new one or the existing one.  Match up the ends of the pipes and then slide the coupling so it covers both ends of the pipe and tighten the clamps.

For cast iron follow the above directions.  You can replace cast iron with pvc or abs pipe.  All residential drainpipe wall thickness is identified by the measurement “schedule 40”.  Be sure when replacing your cracked plumbing vent pipe to purchase the correct thickness.



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