We need some serious advise!

17 years ago

My DH and brother in law are GCing our new construction house. They were told by the town's public works superintendent that they needed to install the clean out and TY at the connection with the sanitary sewer using schedule 40. The borough engineer's inspection later requested a replacement with an SDR 35. There are no codes or reg's requiring this but the borough engineer is insisting on it after we already installed the original. Do we have to replace pipe or do you know of any alternatives? This will cost us time and money to reexcavate and replace. All advise welcome.

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rrmuphy88
17 years ago
SDR stands for Standard Dimension Ratio. The Standard Dimension Ratio is the outside diameter divided by the wall thickness. I will make an assuption your Pipe is 4". That is a wall thickness of .120" And is not pressure rated. I think it is less than 50 psi. SCH 40 has a wall thinkness of .251" and rated to 220 psi. SDR is commonly used on gravity drains and non pressure systems. However SCH 40 is a better product of the two. Sounds like you have an inspector that is used to seeing SDR 35 and has little knowledge of PVC pipe. You can find the two specs for them online and show them that SCH 40 meets and exceeds any SDR 35 PVC. Good luck.
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