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 SDR35 VS SCH40
Author: dan-d-man (IN)

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 rooom ceiling and basement ceiling (full finished). The problem was the sewer pipe outside the yard that caused it all. xxxx-rooter replaced it to proper pipe. The xxxx-rooter found out that the pipe installed by the builder of our home was wrong. 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. Is this true?



Edited 2 times.

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 Re: SDR35 VS SCH40
Author: Marksix

SDR35 is often connected to the PVC Sched. 40 pipe from the house.But since their dimension ratio is different,a special adapter is required.I cannot see how SDR 35 could be glued into a PVC coupling,there would be way too much airspace between the smaller pipe and the fitting.

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 Re: SDR35 VS SCH40
Author: mrh (IN)

Sdr 35 has the same inside diameter as sch 40. How was the pipe installed, Sch 40 inside the house and 3 feet outside then sdr 35 outside?
The problem was the sewer pipe outside the yard that caused it all. xxxx-rooter replaced it to proper pipe. What was the proper pipe and how much of it did they replace? Did they say that the improper connection caused a blockage that caused the flood?



Edited 3 times.

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 Re: SDR35 VS SCH40
Author: e-plumber (NY)

A main sewer line problem, (outside of the house) would NOT cause a 2nd floor toilet to overflow if
there are any fixtures on the first floor or basement level which of course would overflow first.

e-plumber
-----------------------------------------------------------------------------------------------------------------------------------

"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

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 Re: SDR35 VS SCH40
Author: redwood (CT)

Do you have any pictures of this improper connection you can post?

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 Re: SDR35 VS SCH40
Author: hj (AZ)

Sdr 35 has the same inside diameter as sch 40.

true, but that is also the reason a bushing is needed to make the o.d. the same. I seldom believe any notes made by those companies because they usually write something that implies that the original installation was at fault. This is not always the case, nor is their repair always necessary if a proper diagnosis had been done. SDR by itself is not always a problem. It becomes a problem when the weight of the covering ground causes it to deform and become oval, but that would NEVER happen at a coupling where it transitions to sch. 40 PVC.

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 Re: SDR35 VS SCH40
Author: dan-d-man (IN)

xxxx-Rooter installed approximately 15 feet of sewer line.
They installed sch40 pvc outside, coupling and used no. 8 stone and also installed outside clean out.
sch40 is the outside and sdr35 is inside.
sdr35 glued into sch40 pvc that caused the blockage, it falls apart.



xxxx-Rooter said that the pipe collapsed got bent and broke outside. The clean out pipe was installed improperly. The pipe coming from the house was GOOD, the pipe outside was wrong. It was just glued together with no coupling, and no stone underneath. They did not put a coupling but just glued. Does anyone know or a link I could see where in the CODE this is covered?



Edited 2 times.

Post Reply

 Re: SDR35 VS SCH40
Author: hj (AZ)

It is almost impossible to use SDR indoors because they do not make the correct fittings to assemble a drainage system. And that "culprit" looks like it does have the proper bushing inside it.

Post Reply

 Re: SDR35 VS SCH40
Author: North Carolina Plumber (NC)

Did anyone notice what E-plumber said. A bad section of pipe outside would not cause a toilet on the 2nd floor to overflow. I'm thinking the builder is trying to get blamed for something that was not his fault.

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 Re: SDR35 VS SCH40
Author: packy (MA)

have you paid them yet? do not!!! save the evidence and call your attorney. the pipe they replaced was correctly installed. was a permit pulled for this work? it is most certainly required. get your plumbing inspector out for an opinion.
most plumbing codes call for fine sand under plastic pipes not rocks. ask the inspector..
most plumbing codes call for schedule 40 pipe to extend for 10 feet from the house before transitioning to schedule 35.
what ever these crooks have done will not solve a second floor drain problem. the problem will happen again unless the EXACT reason is addressed. by the way, spray some rustoleum on that rusty gas pipe

Post Reply

 Re: SDR35 VS SCH40
Author: e-plumber (NY)

Maybe there was something wrong with the sewer line but it had nothing to do with the 2nd floor overflow or damaged sustained from it. Maybe we're not getting the full story here, like why did the sewer get dug up? Was there another problem besides the 2nd floor toilet clog that lead them to check the main sewer? We don't know for sure from the info in the original post.

e-plumber
-----------------------------------------------------------------------------------------------------------------------------------

"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

Post Reply

 Re: SDR35 VS SCH40
Author: redwood (CT)

Is the 2nd floor drain line leaving the house as a separate drain line from a drain line for any fixtures on the first floor and basement?

The only way I figure that the symptoms could match what they are saying is if you have 2 separate lines leaving the house with 1 of the lines dedicated to the 2nd floor bathroom as diagramed below. The "Problem" area they fixed would be where the red "X" is.



If there is only 1 line leaving the house and no fixtures on the 1st floor were overflowing something is very fishy indeed.

The photo you posted of the Schedule 40 to SDR-35 looks like proper materials were used. These connections may sometimes come apart due to settling of the ground shearing the connection. Is that what happened?

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Since 1995 (3 years before Google started) PlumbingSupply.com has been THE best plumbing supplier on the web. Please visit our sponsor [www.PlumbingSupply.com]

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 Re: SDR35 VS SCH40
Author: hj (AZ)

In this area the dirt dug out of the ditch is all that is required for backfilling unless it is broken up rock.

Post Reply

 Re: SDR35 VS SCH40
Author: jimmy-o (CA)

Don't know what your code is. But section 701 of the CA plumbing code ( more or less = UPC ) calls for sch. 40 inside, and not SDR 35.


And, are we talking about apples and oranges here? I thougth that SDR pipe had the same OD as sch. 40, and the wall thickness varied with pipe size? There is another type of pipe used which is called S&D. It is thin wall, but is used underground, and has different OD than sch pipes. There are special adapters called "S&D to DWV".



Edited 1 times.

Post Reply

 Re: SDR35 VS SCH40
Author: dlh (TX)

SDR has a smaller OD than PVC but is the same as S&D

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PLUMBERS "Protecting The Health Of The Nation"

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 Re: SDR35 VS SCH40
Author: hj (AZ)

The i.d. is the same as sch. 40 so there is no obstruction where the two pipes join, but since the wall thickness is thinner the o.d. is smaller.

Post Reply

 Re: SDR35 VS SCH40
Author: DHWheater (PA)

Sound's like it could have been another one of those "free" "magical" camera inspections?

Post Reply

 Re: SDR35 VS SCH40
Author: e-plumber (NY)

Must have been a 'slow' day.

e-plumber
-----------------------------------------------------------------------------------------------------------------------------------

"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

Post Reply

 Re: SDR35 VS SCH40
Author: hj (AZ)

With a previously recorded stock tape showing the repair needed.

Post Reply

 Re: SDR35 VS SCH40
Author: jimmy-o (CA)

So, back to my question, which may relate to the OP's problem: are SCR and S&D two different things, and does it appear that he may have S%D rather than SDR?

Post Reply

 Re: SDR35 VS SCH40
Author: dlh (TX)

they are basically the same thing just different names

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PLUMBERS "Protecting The Health Of The Nation"

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 Re: SDR35 VS SCH40
Author: dan-d-man (IN)

The plumber who originally installed with the builder of our house did not put a coupling and no stone underneath but just glued SDR30 with SCH40 according to the report of the plumber who replaced the right pipe. Anyone knows a link for Indiana Plumbing Code concerning this SDR35 VS SCH40 connection? I appreciate it if someone knows.



Post Reply

 Re: SDR35 VS SCH40
Author: e-plumber (NY)

Place a general phone call to the (local) Plumbing inspector, you'll get the most accurate info - straight from the horse's mouth.

e-plumber
-----------------------------------------------------------------------------------------------------------------------------------

"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

Post Reply

 Re: SDR35 VS SCH40
Author: hj (AZ)

The plumber who originally installed with the builder of our house did not put a coupling and no stone underneath but just glued SDR30 with SCH40 according to the report of the plumber who replaced the right pipe.

That is placing a lot of trust in the integrity of the "plumber who replaced the right pipe," because we are not sure that is what he did, or if it was really necessary. The only requirement for connecting the two types would be that the proper transition piece be used, and from that picture it looks like that is what was done. Here, we do not use stone, or sand, or gravel under the pipe. Whatever is dug out of the ditch goes back in and is packed around the pipe.

Post Reply

 Re: SDR35 VS SCH40
Author: LemonPlumber (FL)

N.C.P.Your not a betting man are you?The install looks poor but ,The second story thing is yet another problem yet to be resolved.Good Luck.

Post Reply

 Re: SDR35 VS SCH40
Author: redwood (CT)

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Since 1995 (3 years before Google started) PlumbingSupply.com has been THE best plumbing supplier on the web. Please visit our sponsor [www.PlumbingSupply.com]

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