3 months ago we had water damage from our masterbathroom toilet that overflowed. The water went down to the living room and down to the basement. It was a major damage that took 3 months to repair. We had to replace the vinyl flooring in our masterbathroom floor, fixed the living room and full finished basement's ceiling. The problem was the sewer pipe outside the yard that caused it all. The plumber replaced and installed properly the wrong pipe. They've found out that the original pipe installed by our home builder was defective. In their description of work, they wrote "THERE WAS SDR35 PIPE GLUED INTO A SCH40 PVC COUPLING WHICH IS AN IMPROPER CONNECTION. SDR35 IS A THINNER WALL PIPE THEREFORE THE SDR 35 PIPE WAS NOT IN THE COUPLING PROPERLY. THERE WAS ALSO NO STONE UNDER PIPE BY HOUSE CAUSING FURTHER PROBLEMS. PROBLEM WOULD NOT HAVE HAPPENED IF PROPERLY INSTALLED." The builder of our home told us that SDR35 and SCH40 is compatible. The plumber said that the pipe collapse, got bent and broke outside. The clean out pipe was installed improperly by our home builder. The pipe coming from the house was GOOD, the pipe outside was installed wrong. It was just glued together with no coupling, no stone underneath. The builder of our home did not put a coupling, but just GLUED the SDR30 with SCH40. If SDR35 and SCH40 is compatible, what is the proper connection?

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Is SDR35 & SCH 40 Compatible?

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No! SDR,(Standard Dimension Ratio) 35 is a gasketed push together pipe
Schedule 40 pipe is a glue together pipe
The correct way to join these to (or any two) dis-similar pipe is with a transition coupling a Fernco or other type shielded coupling.
Regards, Tom,

As Tom Said... best way to join these two different pipe types is by using a reducing fernco coupling... see pic. Below.

Good luck!

Mark

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Originally Posted by dan-d-man

3 months ago we had water damage from our masterbathroom toilet that overflowed. The water went down to the living room and down to the basement. It was a major damage that took 3 months to repair. We had to replace the vinyl flooring in our masterbathroom floor, fixed the living room and full finished basement's ceiling. The problem was the sewer pipe outside the yard that caused it all. The plumber replaced and installed properly the wrong pipe. They've found out that the original pipe installed by our home builder was defective. In their description of work, they wrote "THERE WAS SDR35 PIPE GLUED INTO A SCH40 PVC COUPLING WHICH IS AN IMPROPER CONNECTION. SDR35 IS A THINNER WALL PIPE THEREFORE THE SDR 35 PIPE WAS NOT IN THE COUPLING PROPERLY. THERE WAS ALSO NO STONE UNDER PIPE BY HOUSE CAUSING FURTHER PROBLEMS. PROBLEM WOULD NOT HAVE HAPPENED IF PROPERLY INSTALLED." The builder of our home told us that SDR35 and SCH40 is compatible. The plumber said that the pipe collapse, got bent and broke outside. The clean out pipe was installed improperly by our home builder. The pipe coming from the house was GOOD, the pipe outside was installed wrong. It was just glued together with no coupling, no stone underneath. The builder of our home did not put a coupling, but just GLUED the SDR30 with SCH40. If SDR35 and SCH40 is compatible, what is the proper connection?

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Both Lowe's and Home Depot sell a 'Glue Type' coupling that is an acceptable transition from SDR 35 to Schedule 40 PVC -- The coupling glues into the hub of a Schedule 40 fitting and over SDR 35 pipe.

Thanks Growler,
The Plumbing Page can always depend on you to keep us up on the new stuff.
Thanks again, Tom