Changing external gulley to internal and adding toilet.

Joined
5 Nov 2021
Messages
78
Reaction score
9
Location
Gloucestershire
Country
United Kingdom
Hi
As per pic this will all become internal within a new extension and I would like a toilet where the white arrow is. Builders are sorting the main shell build but I'm doing all internals when they are gone - but obviously need to get something in before block and beam floor goes down.

For the existing basin, sink and shower waste shown in that corner - is it best / ok to just convert that gulley to an 90 degree upstand with a waste adapter - therefore relying on the individual water traps on those waste pipes - or is there such thing as an internal gulley that has it's own water trap. Obviously I'll board everything in when it becomes the new toilet.

Then I'd look to just add a junction at the white arrow to install the new toilet later on. Anything I need to be aware of?

Build Control is involved but I'd like to stay ahead of the game.

Thanks in advance.

Drains.jpg
 
Sponsored Links
Joined
5 Nov 2021
Messages
78
Reaction score
9
Location
Gloucestershire
Country
United Kingdom
Rodding access if ( when ) you need to clear a blockage.

That was part of the thinking behind just having a 90 bend to replace the gulley - and leaving top access to it when I have boarded it in so that worse case I can get to it from that end. Thinking I'd have to be unlucky for the blockage to occur in a spot between the new toilet and that junction before it meets that inspection chamber though would you have thought?
 
Sponsored Links
Joined
5 Nov 2021
Messages
78
Reaction score
9
Location
Gloucestershire
Country
United Kingdom
You should also consider changing that "T" junction to an angled junction to avoid ( reduce ) the risk of some poo going the wrong way and creating a pile of solid poo.

View attachment 268411
Good point !
The middle run in the pic is the main loo and therefore should create a reasonable flushing of that area - but if it can be done now then it's worth it. Cheers.
 
Joined
3 Feb 2008
Messages
7,737
Reaction score
1,910
Location
Northamptonshire
Country
United Kingdom
Whoever put that in needs to go back to school and learn how to lay Drainage I'm afraid. If the BCO passes that I'll be amazed. Needs a Chamber where the pipes converge so all laterals are accessible for rodding should the need arise. At the moment you've an existing WC and you proposed WC (Replacing the Gully), coming in on blind laterals, if they were to block upstream of the junctions, you are not going to be able to get rods or a Jetting hose round to clean them out.

You need a 450mm Chamber, where marked. Bring #1 in using a bend immediately outside the chamber, then 2 & 3 in on the side connections. Use risers as required to get to FFL, and fit a suitable internal sealed cover.
Dodgyrog.jpg


Gulley can be replaced with a Stub Stack, just leave a decent length of 110mm pipe available, cap it, then cut it down as required at a later date to accommodate WC outlet.
 
Joined
24 Sep 2006
Messages
19
Reaction score
1
Location
Gloucestershire
Country
United Kingdom
Whoever put that in needs to go back to school and learn how to lay Drainage I'm afraid. If the BCO passes that I'll be amazed. Needs a Chamber where the pipes converge so all laterals are accessible for rodding should the need arise. At the moment you've an existing WC and you proposed WC (Replacing the Gully), coming in on blind laterals, if they were to block upstream of the junctions, you are not going to be able to get rods or a Jetting hose round to clean them out.

You need a 450mm Chamber, where marked. Bring #1 in using a bend immediately outside the chamber, then 2 & 3 in on the side connections. Use risers as required to get to FFL, and fit a suitable internal sealed cover. View attachment 268413

Gulley can be replaced with a Stub Stack, just leave a decent length of 110mm pipe available, cap it, then cut it down as required at a later date to accommodate WC outlet.

Thanks for the comments. If I can add a bit more background maybe that will explain some aspects but still keen to take on board everything. There originally was a chamber at the place you marked but it had to be shifted to the new chamber shown as the main extension will obscure the whole area shown thereby giving no access due to block and beam floor of a rear sun room covering the whole of this dug out area - with an extra WC tucked in the corner. BCO did comment whilst inspecting the footing trench and seemed to be helpful / pragmatic along the lines of saying “it’s not ideal but you’re not going to want an inspection chamber in the middle of your room and seeing as it’s only 2 to 3 metres max run I can’t see too much of an issue….” I had explained that run #1 was capped off just inside the bungalow as it used to be a wet room but no longer. But I wanted it still hooked up in case we needed access from that end in the future.
Maybe that helps or further worsens the situation but I appreciate your advice either way.
 
Joined
3 Feb 2008
Messages
7,737
Reaction score
1,910
Location
Northamptonshire
Country
United Kingdom
If BCO is happy to pass it then it's your call. Personally I wouldn't want that setup buried under the floor in case something went wrong. Chambers inside buildings are never ideal, but sometimes just cannot be avoided. Appreciate they're not long runs, but unless you can find rods or a jet thats steerable once up the pipe, you'd struggle to unblock 2 or 3 if the worst happened.

Think I would have looked at getting them outside the footprint of your proposed extension separately before joining everything with a chamber, would need some bends further back to get the right angles, but at least each section could be jetted if need arose.
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Top