Plumbing a basin waste pipe - why is it so difficult?
Discussion
My blood pressure is going through the roof. I have a downstairs cloak room now full of an assortment of plumbing bits, bit this is not coming together. Turning to the PH brotherhood to alleviate the tightness that is in my chest!
We have a basin where the underside is visible. It has a chrome bottle trap, looks nice, but when it was installed 10 years ago, it would not stop leaking. I have deduced that the the wall was drilled through (outside wall, cavity, inside wall) but that trajectory goes off at a slight angle. When the sink waste was connected, there is a sideways strain that caused leaks.
I have some recollection of when the sink was fitted, but had one guy plastering, another plumbing, another tiling. I do not know who drilled the hole or at what stage.
At time of installation, I recall buying 32mm chromed (metal) pipe, but that was too small for the chrome bottle trap. It actually took 35mm chromed pipe. The bottle trap came with 300mm of 35mm chrome pipe, but there was nothing to attach it to at the wall. I therefore found a long piece of 35mm chrome pipe, took it through the wall, then had push fit 34mm 90 degree bend, taking it to some pipe to the drain, that is also 35mm outside diameter. It kind of worked by trial and error. I had to resort to using Plumbers Mait around the sink waste to stop it leaking. Took ages to get it OK, but I saw from underneath how badly everything was misaligned. Even the bottle trap was at a slight angle.
I have just had to replace the click clack pop up waste so I have had it all in bits, and I can see that things are off course. Reassembly inevitably caused leakage again. I am trying to fix it properly now - bit it is really doing my nut. I buy 32mm fittings - but the outside diameters can be larger, and that causes me problems.
Rather than taking a long metal pipe through the wall all the way to bottle trip, I deduced that plastic through the wall is better. It can bend a little. Then if can attach a length of chromed metal pipe from the sink to the wall,I can get everything straightened up.
Problem 1 - attaching 35mm metal pipe to plastic pipe
I want to join different types of pipe, hide the join, and just leave the nice chromed section of pipe in view. I found a nice little converter that is chromed, fits 35mm pipe on one side with a compression fitting, and can take '32mm' ABS pipe to the other side, solvent fixed. If I can wide the hole in the tile, I may be able to push this sufficiently into the wall that only the chrome part is in view, plus I can use a chromed cover. However....
Problem 2 - 32mm ABS pipe is even fatter than 35mm pipe
So - I tried to shove the 32mm ABS pipe through the wall, but it just won't go in. The pipe is fatter still than the rigid 35mm pipe that there was there before. This means - to use a solvent connection/pipe, I would have to wide then hole - all the way through the wall. That is turning one job into a bigger, messier, more destructive one. I also risk damaging the tile. I was thinking I could use the other bit of 32mm plastic pipe, that is narrower but...
Problem 3 - the other section of 32mm plastic pipe will not be suitable for solvent fixing
I am assuming that the lovely 32mm plastic pipe, that easily passes through the thickness of the wall and would allow straightening up of everything, is only for compression fittings. Is that right? So solvent 32mm pipe is thicker, with a larger outside diameter (making it 35mm), than 32mm compression pipe?
So, I am feeling rather stuck!
I expect that best practice is to use one fixing system end to end for standardisation - all push fit or all solvent.
Other than that - I have to re-drill the thickness of the wall. I think widening a hole with a circular SDS cutter will be difficult, but is there such a thing as a ~38mm solid drill bit? I guess not, it would be very heavy.
So...I am stuck. Please help if you can!
Thanks!
We have a basin where the underside is visible. It has a chrome bottle trap, looks nice, but when it was installed 10 years ago, it would not stop leaking. I have deduced that the the wall was drilled through (outside wall, cavity, inside wall) but that trajectory goes off at a slight angle. When the sink waste was connected, there is a sideways strain that caused leaks.
I have some recollection of when the sink was fitted, but had one guy plastering, another plumbing, another tiling. I do not know who drilled the hole or at what stage.
At time of installation, I recall buying 32mm chromed (metal) pipe, but that was too small for the chrome bottle trap. It actually took 35mm chromed pipe. The bottle trap came with 300mm of 35mm chrome pipe, but there was nothing to attach it to at the wall. I therefore found a long piece of 35mm chrome pipe, took it through the wall, then had push fit 34mm 90 degree bend, taking it to some pipe to the drain, that is also 35mm outside diameter. It kind of worked by trial and error. I had to resort to using Plumbers Mait around the sink waste to stop it leaking. Took ages to get it OK, but I saw from underneath how badly everything was misaligned. Even the bottle trap was at a slight angle.
I have just had to replace the click clack pop up waste so I have had it all in bits, and I can see that things are off course. Reassembly inevitably caused leakage again. I am trying to fix it properly now - bit it is really doing my nut. I buy 32mm fittings - but the outside diameters can be larger, and that causes me problems.
Rather than taking a long metal pipe through the wall all the way to bottle trip, I deduced that plastic through the wall is better. It can bend a little. Then if can attach a length of chromed metal pipe from the sink to the wall,I can get everything straightened up.
Problem 1 - attaching 35mm metal pipe to plastic pipe
I want to join different types of pipe, hide the join, and just leave the nice chromed section of pipe in view. I found a nice little converter that is chromed, fits 35mm pipe on one side with a compression fitting, and can take '32mm' ABS pipe to the other side, solvent fixed. If I can wide the hole in the tile, I may be able to push this sufficiently into the wall that only the chrome part is in view, plus I can use a chromed cover. However....
Problem 2 - 32mm ABS pipe is even fatter than 35mm pipe
So - I tried to shove the 32mm ABS pipe through the wall, but it just won't go in. The pipe is fatter still than the rigid 35mm pipe that there was there before. This means - to use a solvent connection/pipe, I would have to wide then hole - all the way through the wall. That is turning one job into a bigger, messier, more destructive one. I also risk damaging the tile. I was thinking I could use the other bit of 32mm plastic pipe, that is narrower but...
Problem 3 - the other section of 32mm plastic pipe will not be suitable for solvent fixing
I am assuming that the lovely 32mm plastic pipe, that easily passes through the thickness of the wall and would allow straightening up of everything, is only for compression fittings. Is that right? So solvent 32mm pipe is thicker, with a larger outside diameter (making it 35mm), than 32mm compression pipe?
So, I am feeling rather stuck!
I expect that best practice is to use one fixing system end to end for standardisation - all push fit or all solvent.
- 32mm Solvent pipe is too fat for the wall, but I can easily join it to the 35mm metal pipe to the bottle trap and hide the join.
- 32mm fits through the wall, but it would be compression fittings. Even if I could hide the change, it will be tough joining 35mm metal pipe to 32mm plastic pipe.
Other than that - I have to re-drill the thickness of the wall. I think widening a hole with a circular SDS cutter will be difficult, but is there such a thing as a ~38mm solid drill bit? I guess not, it would be very heavy.
So...I am stuck. Please help if you can!
Thanks!
k me i think youve just summed up every plumbers day in one post. Prob pictures would help.TUS373 said:
I have a Mcapline converter, but like I said, it is for solvent pipe...and 32mm solvent pipe is too fat!
Think of this but with a light sand paper (wet paper is best imo) on plastic pipe https://www.youtube.com/watch?v=aZcd8wgUXPMYou'll run out of space by the sounds of things if you try using any adapters for push fit to solv weld etc.... its only a ballhair youll need to find before solv weld pipe will work but it does need to be smooth so no silly 100 grit paper that leaves scratches for the push fit rubber.
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