Bathroom waste setup

[Dougie212]

Hi there..

So after my previous thread about the underground drainage Im finally ready (after loads of help and advice from you guys) to start the job... before I start, Im of the mindset that I want to get everything sorted out in one go, so I just wanted to check that my bathroom drain pipes setup is ok or should the drain pipes be running elsewhere? The downpipe will be running into the back access of my new gully I will be fitting so I just wanted to check that everything was ok, or if improvements could be made, what they would be..



Thanks as always
Dougie.

 

[Bonni]

The sink and bath wastes should be bossed into the soil stack.

 

[Hugh Jaleak]

Ideally boss the wastes into the stack, but looking at the stack and the wastes, they are certainly rather faded and may be a bit too brittle to safely cut into. I worry if you damage the stack, then that's additional unwanted work and expense to replace, although for the sake of a days work and £100 worth of bits, now might be the best time to do it, whilst everything below is being sorted.

Hoppers for wastes are horrible, unsanitary affairs, hence why they were banned about 40 years ago now.

 

[Dougie212]

Thanks for your answers as always guys..
Hugh, I think as I’m doing it I’d rather do it properly, and from your suggestion about using both runs still I can even do one at a time and get it done right..

 

[Dougie212]

Sorry to bring this up again... easier to ask than scratch my head in Wickes looking at different pieces..... the black downpipes and hopper seem to be held together at the joints by nothing more than gravity. I think they are plastic weld fittings (dont know if thats the right technical term. Im going to take everything from the hopper down away, and just come straight down with a single piece of pipe with a Y junction which the guttering left of picture attached. Is there anything push to fit that will fit on the black pipe at the top so that I can use push fit fittings? Thanks as always

 

[Hugh Jaleak]

Usual practice is just to slot rainwater fittings together, and rely on gravity to send the flow the right way. Wickes stuff should be compatible with what's already there, but there can be slight variations on sizing between manufacturers, making fitting spigots tight in downpipe and downpipes loose in sockets. Use one of these to join downpipes. https://www.wickes.co.uk/FloPlast-RS1B-Round-Line-Downpipe-Pipe-Socket---Black-68mm/p/431860

Some put a self tapping screw in each joint to hold things together, personally think if the pipework is fitted and supported correctly, screw shouldn't be needed.

 

[Dougie212]

Sorry to re-ignite this post... i'm just getting the parts together to do the soil stack. Ive looked at various boss setups and because I need waste pipes to enter from both sides I think the best way is to use the current design again with new pipes and boss the wastes in with strap on bosses. Just wondering, from my current setup, they seem to have used a Y junction into a 90 degree bend to take the pipe into the house. Is this a common thing to do as a brief look on the usual shop websites suggests that no where does a Y junction for soil stacks in black..... unless I've missed them.

 

[AlanE]

Get one of these from BES or builders merchant and realign the 90 degree to suit.

https://www.bes.co.uk/soil-pipe-drainage-1121-2-branch-tee-110mm-black-13685

 

[Dougie212]

Would that result in the toilet coming out and away from the wall to turn into the front of that fitting though?

 

[Hugh Jaleak]

135° junctions are available in black. https://www.lowcostplumbingsupplies.co.uk/black-110mm-soil-45-degree-double-socket-junction-8027 or https://www.easymerchant.co.uk/110mm-push-fit-soil-135-degree-double-socket-y-junction/ However, looking at available room I'd use a 92.5° junction, and then just rotate the 90 bend coming through the wall to suit, to raise the point where the WC enters the stack. (Not sure what you were planning, but I'd renew right back to the WC, including pan connector to allow realignment externally as required and no risk of a leak if you've disturbed anything existing.)

Reason being, you have the no connection zone for wastes in the 200mm section below the soil branch, this will allow you more room to connect that waste from the left without falling foul, (literally) of this zone. The right hand waste looks like it can come in slightly lower if need be, main issue is clearing the windows either side of the stack.

 

[Dougie212]

Brilliant as always Hugh.... thanks ever so much. I do intend to replace everything including the WC connector. Thanks ever so much!

 

[AlanE]

Would that result in the toilet coming out and away from the wall to turn into the front of that fitting though?

Can't believe you actually asked that!! You assemble the thing with the inlet aligned the way you want it.