Connecting two toilets to one internal waste hole

9 Sep 2012
Reaction score
United Kingdom
Im putting a toilet upstairs in the bathroom(no toilet before) and i want to connect it to the toilet in the cloak room directly underneath. The soil pipe from the lower toilet goes straight into the floor in the house (thats all of the soil pipe you see) Question two toilets ontop of each other , one internal waste hole. how do i connect the two?
Sponsored Links
Depends on your house but very doable its done in loads of houses.

Without seeing you would

Break up around existing waste hole and move it into a corner of the room under the floor.
Take the soil pipe up 7" and branch off to your downstairs WC.
Then take the soil up to your next floor (depending on joists could be easy or hard)
Branch off above the floor again to next WC
Then either take the soil up into the loft space or just into a boxing and fit a air admittance valve (If you already have a open vented stack) or take the vent pipe out side some how (either through the wall or roof (which evers easiest)
Theminate the vent 900mm above any windows (for smell)

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