Soil pipe - small diameters

bbjc · 22 Mar 2019

No sure if its any good in here...but will give it a go anyway. Said I,d replace a piece of soil pipe for a customer whilst doing a roof repair assuming it would be a quick easy job. Fast forward to about twenty different plumber merchants later without success. Problem is the pipe goes from 68mm to 82mm pipe. Bottom part 68. Top part 82. Needing something that connects inside the 68. And underneath the 82mm pipe above. Cut out say a metre of the pipe that was damaged. Assuming these things would be readily available.

Wondering if anyone has any ideas.

Thanks in advance.

Chris.

rsgaz · 22 Mar 2019

You might be better off in the plumbing forum, or maybe people like @Ian H , @HERTSDRAINAGE2010 or @Hugh Jaleak could help out?

Ian H · 22 Mar 2019

68mm is rainwater pipe and 82mm is small soil stack that I only ever see in and around Burnley.

I think you will struggle. It would be easiest to take the 68 all the way up or try a builders yard.

What about a hopper? Assuming you don’t mean soil pipe for turds.

https://www.screwfix.com/p/floplast-hopper-68mm-black/13847

bbjc · 22 Mar 2019

Cheers for the reply mate. Pipe bit that needs replacing is at the bottom. Reckon a hopper would look out of place there. The soil pipe goes into the customers home in places....hence why its harder to just replace the whole thing. Was wondering if one of them flexiseal clamp things would maybe do it. Failing that....there is a reducer that goes from 82 to 68mm that sits into the 68 pipe. Think it goes down to 63mm. So fits inside. But with the pipe not having much bend wondering if its even possible to get it in. Then the 82mm pipe into that bearing in mind that 82mm pipe has to fit into the same solid fixes 82mm pipe above it.

Proving a tough one. Cheers again for the reply mate.

bbjc · 22 Mar 2019

bbjc · 22 Mar 2019

There's a pic there if its any help. The plastic pipe is 82mm. The plastic one that starts a little bit up the wall. Connected up all right above but water comes down the stack and goes on the outside of the pipe because the 82,s bigger than the 68. The very hot to me has a small bit of 68mm pipe inside the collar.

Hugh Jaleak · 22 Mar 2019

Whatever you do, do not reduce the internal diameter, you'll cause a pinch point and will probably be back every week to unblock it, until you change it again. 68mm is for rainwater anyway, soil from a WC needs to be a minimum of 82mm (3"), and sealed all the way down, with a direct connection to the drain.

If it's the bottom section that needs replacing, is there enough good pipe above ground level to cut it there, put a Fernco coupling on, and put a plastic section in?

bbjc · 22 Mar 2019

Cheers buddy. The bottom half meter of pipe connect inside the house. But there is a small bit of 68mm pipe that protrudes out underneath that 82mm. Wondering if the ferco couplings would get a tight enough fit to make sure no water comes out the bottom.

undertrained · 22 Mar 2019

Looks like rainwater pipe to me, some cast, some looks like asbestos cement.

Hugh Jaleak · 22 Mar 2019

Ah, so the junction is at the foot, and it's broken there? I can see 3 possible options. One, find a Collar that will go over the outside of the existing pipe, (has the old pipe broken away at the socket under the junction?), and replace downwards to the drain, two, carefully remove the collar from the bottom of that junction, and again, replace downwards to a point where the pipe size either is the same, or increases, or lastly, (and my preferred option), replace the junction, the pipework through the wall and down to the drain, with new plastic.

Any attempt to bodge it up with rainwater pipe is only ever going to cause issues. If you can get it to seal, it's not going to take long before it blocks. It looks to me like there's another WC junction at first floor level, and there's a good reason why you never reduce diameter on soil pipes or foul drains.

bobasd · 22 Mar 2019

if "the bottom half meter connects inside the house" whers the tee?

that lot looks like a rain water pipe.if it is replace the lot with, say Floplast 68mm RWP.
RWP should discharge just above a gulley - any signs of a gulley?
can you do photos showin the gutter an any tee?

just sayinbut as a roofer(? ) you seem out of your depth an thats a bad thing if you do have to start connectin thro the wall to the wc an underground for a proper 110mm SVP connections?
just sayin because things like that jumble have a habit of goin south when you start tryin to fixin them.

bbjc · 22 Mar 2019

Hugh Jaleak said:
Ah, so the junction is at the foot, and it's broken there? I can see 3 possible options. One, find a Collar that will go over the outside of the existing pipe, (has the old pipe broken away at the socket under the junction?), and replace downwards to the drain, two, carefully remove the collar from the bottom of that junction, and again, replace downwards to a point where the pipe size either is the same, or increases, or lastly, (and my preferred option), replace the junction, the pipework through the wall and down to the drain, with new plastic.

Any attempt to bodge it up with rainwater pipe is only ever going to cause issues. If you can get it to seal, it's not going to take long before it blocks. It looks to me like there's another WC junction at first floor level, and there's a good reason why you never reduce diameter on soil pipes or foul drains.

Not broken at the bottom. It was broken higher up mate. Someone had placed that light gray pipe on to it to try to solve the problem. Because its bigger than the 68mm pipe at the bottom. Water was coming out the bottom. I cut the cast a bit higher up than it was broken. The bottoms intact. The only problem being the connections seems to be 68mm. The pipe directly above is 82mm. Fixed fine at the top connection. The problem is connecting the 82 the light gray pipe into the 68mm. You,ve got the two brackets at the bottom. Above that second bracket is a small bit of 68mm pipe that's pretty much stuck into the second bracket. Wondering if a reducer would do it. Seen that you get ones from 82 to 68. Problem being is can it even be fitted cause the pipes pretty straight.

Sorry for the terrible explanation guys. And cheers for the advice so far.

I m saying the other ones 68. But the picture actually looks like it could also be 82mm. The problem is patching it in. Water comes down it. The connections perfect at the top of the light gray pipe. The problem is the bottom of the gray pipe. Water runs down the connection. Cause the connections on the outside of the inner pipe as opposed to going inside it. Wondering if there's anything anyone knows to connect it inside so the water runs down the pipe.

bbjc · 23 Mar 2019

bobasd said:
if "the bottom half meter connects inside the house" whers the tee?

that lot looks like a rain water pipe.if it is replace the lot with, say Floplast 68mm RWP.
RWP should discharge just above a gulley - any signs of a gulley?
can you do photos showin the gutter an any tee?

just sayinbut as a roofer(? ) you seem out of your depth an thats a bad thing if you do have to start connectin thro the wall to the wc an underground for a proper 110mm SVP connections?
just sayin because things like that jumble have a habit of goin south when you start tryin to fixin them.

Defo out of my depth connecting it inside the house mate. Pretty sure its just needing to connect up the bottom of that light gray pipe to inside the drainpipe tho. Expected it to be a simple job. Getting the proper bit/s for its proving to be a nightmare tho.

No photos of gutter. But pipe goes above the gutter through the bottom of the roof and sealed off with a cap at the top. Couple of pipes go inside the house from the pipe. These seem fine tho. The breakage was initially where the light gray pipe near the bottom was.

Hugh Jaleak · 23 Mar 2019

To be honest you've got a complete bodgejob there by the sound of it. I think the best advice would be to replace the lot, if you're not confident enough to do it, walk away, and advise them to get a Plumber in to sort it out properly. I suspect the reason you cant find the 'proper bits' is because they're not made. 68mm rainwater to 82/110mm soil pipe fittings dont exist, all you'll get is 68mm-110mm adaptor for where a rainwater pipe goes into the drain at ground level.

If that is carrying soil from a WC, you dont want that leaking all over the place, or all over you for that matter.

bbjc · 24 Mar 2019

Hugh Jaleak said:
To be honest you've got a complete bodgejob there by the sound of it. I think the best advice would be to replace the lot, if you're not confident enough to do it, walk away, and advise them to get a Plumber in to sort it out properly. I suspect the reason you cant find the 'proper bits' is because they're not made. 68mm rainwater to 82/110mm soil pipe fittings dont exist, all you'll get is 68mm-110mm adaptor for where a rainwater pipe goes into the drain at ground level.

If that is carrying soil from a WC, you dont want that leaking all over the place, or all over you for that matter.

Cheers for the advice mate. Think it may be time to get a plumber in. Not all that sure it is the soil pipe. Only appears to be water going down it. Defo protrudes out the roof and is capped and a few pipes enter the house from the pipe. I m thinking soil pipe but not 100 percent sure. The 82mm pipe is something someone's put on as a temporary measure think the main pipe might actually be 68mm. Which makes me think not the soil pipe. Wondering if. I can maybe get rid of the 82mm. Then connect a piece of new 68mm with a reducer to fit into the bottom. Think the 68mm connector fits into the bottom cause the bottom of the reducers 63mm. Fit the same connector at the top of where the 82mm pipe currently is then fit the new 68mm pipe into it. Just wondering bearing in mind how straight the pipe is if its even possible. Will need a bit of flexibility to it I,d have thought. The other plan was the flexiseal clamp thing. No sure if the can seal pipes that are heading down the way tho. Looks like to fix side on pipe to me.

Just to confirm....the first half metre seems to be 68mm pipe. Then the 82mm pipe is fitted after that. The light gray pipe. That goes up to just above the first floor window. Then seem to be the 68mm pipe again after that. I m thinking do away with the 82. Add a connector at the top of where it was. A connector at the bottom half a metre up. Then fit a new 68mm pipe where the 82 is. that even possible to fit with little movement in the pipe.

Cheers again people.

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Soil pipe - small diameters

undertrained

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