WASTE PIPE TO TOILET

[grifter]

I have good access to the soil pipe due to removing a wall for renovations. I will be fitting a toilet only about 2 feet away from it. It's on the ground floor.

As you look at the picture, l need to add a pipe from the stack coming out about 16" then turning right through the opening to the back of the toilet which is about 12".

Which boss fixing do l need to attach to the stack and can most of the run be done using a flexible pan connector??
A 90 degree bend that comes out clear of the solid wall, then a flexible adaptor?

The stack is 110mm. Should l connect as low as possible? The gradient and distance won't be very much As the toilet is literally the other side of the wall.

Thanks for any advice

 

[Hugh Jaleak]

You need to graft a 110mm Junction into the stack, ideally at the right sort of height to allow sufficient fall to the pan, about 25mm over 2 feet should suffice. Given what you've got, the junction will probably have to go into the existing socket at ground level, (there is one available with a Boss opposite to retain the waste connection). Use a stub of pipe in the top of the junction, then a slip coupler above that to make the top joint back onto the existing stack. Use 110mm pipe and fittings as much as possible, ideally just a rigid Pan Connector for the final section from pan to stack.

Be careful if/when you remove the existing pipe from the socket, although depending on age, will determine how flexible that seal still is, it may require additional work, i.e. the replacement of the socket/coupling below floor level, to ensure a water/air tight joint there.

 

[grifter]

You need to graft a 110mm Junction into the stack, ideally at the right sort of height to allow sufficient fall to the pan, about 25mm over 2 feet should suffice. Given what you've got, the junction will probably have to go into the existing socket at ground level, (there is one available with a Boss opposite to retain the waste connection). Use a stub of pipe in the top of the junction, then a slip coupler above that to make the top joint back onto the existing stack. Use 110mm pipe and fittings as much as possible, ideally just a rigid Pan Connector for the final section from pan to stack.

Be careful if/when you remove the existing pipe from the socket, although depending on age, will determine how flexible that seal still is, it may require additional work, i.e. the replacement of the socket/coupling below floor level, to ensure a water/air tight joint there.

I've done a drawing of how l need it. As you can see from the picture, there is a waste for the sink in its current position, but it will be moved to the other side of the wall and since l will be able to go through a stud wall (not built as yet) l want to run both toilet and new sink position waste through to avoid having to go through the solid wall.

Where the waste currently joins the stack, could l remove that section of the stack and replace with new waste pipe and new pipe for the toilet off the same section (l'm not too familiar with all the different branch attachments etc).

Where the waste boss strap is at the moment (185mm from floor to grey strap) if l was able to join into there with new pipe would that be an option?

 

[Hugh Jaleak]

You cannot 'join' a Toilet to the existing pipe, you will need to cut a section out and fit a Branch, e.g. https://www.bes.co.uk/soil-pipe-drainage-921-2-branch-tee-110mm-grey-12979/ Waste can be connected in at a suitable point using a Boss.

 

[grifter]

You cannot 'join' a Toilet to the existing pipe, you will need to cut a section out and fit a Branch, e.g. https://www.bes.co.uk/soil-pipe-drainage-921-2-branch-tee-110mm-grey-12979/ Waste can be connected in at a suitable point using a Boss.

I realise that and not sure how l gave the impression l thought l could just join the toilet to the pipe. I just didn't know how to branch off properly so l appreciate the link you put in, thank you.

What are the blanked off smaller branches for, other pipe?

Do you think l need to get the bottom of the branch connected just below ground level then to allow adequate fall for the toilet?

 

[dilalio]

You cannot 'join' a Toilet to the existing pipe, you will need to cut a section out and fit a Branch, e.g. https://www.bes.co.uk/soil-pipe-drainage-921-2-branch-tee-110mm-grey-12979/ Waste can be connected in at a suitable point using a Boss.

I think you read him wrong mate.
He's not suggesting fitting toilet onto 40mm. He knows a branch has to go in.

I believe!

 

[dilalio]

I realise that and not sure how l gave the impression l thought l could just join the toilet to the pipe. I just didn't know how to branch off properly so l appreciate the link you put in, thank you.

What are the blanked off smaller branches for, other pipe?

Do you think l need to get the bottom of the branch connected just below ground level then to allow adequate fall for the toilet?

Lol. You posted while I was typing!

 

[dilalio]

What are the blanked off smaller branches for, other pipe?

You can hole saw one or both out to receive waste pipe of 50mm (or 40, or 30 with reducers) in your case... The new sink connection. The 'ears' can be sawn off flush if they are not used and are binding against something like a wall if the soil is very close to it.

It's best to run all waste runs to a stack and connect into that, rather than joining onto horizontal runs.

Do you think l need to get the bottom of the branch connected just below ground level then to allow adequate fall for the toilet?

You should always aim for the correct fall, but at this short distance, you would get away with it being level.

If the socket at the base of the stack is ring seal, which it looks to be, give it a good clean up before cutting and removing a section of the pipe above.
In most cases you can buy a sacrificial coupling and 'harvest' the rubber seal from it to replace the worn one on the existing socket.

Plenty of silicone grease will help.