Installing additional toilets

Question

My question is as follows: If I was to have 2 additional toilets installed on top of 2 existing toilets in a warehouse, would we need to extend the external waste pipes / waste channel?

Mihai · Answer

Yes, in most cases you can connect the two new toilets into the existing soil stack, provided the current drainage system has sufficient capacity and complies with Building Regulations.

You will not necessarily need to extend the external waste pipes or drainage channel if:
• The existing soil stack is correctly sized for the additional load.
• There is adequate venting to prevent siphonage.
• The pipe gradients and branch connections meet current regulations.

Before proceeding, a site inspection should confirm the condition, diameter and capacity of the existing drainage system. If the current stack or drains are undersized, or if the new toilets are a significant distance from the existing connections, modifications or an additional external soil stack may be required.

Michael · Answer

Yes you would in order to plumb the new toilets in.

David · Answer

Hi Paul 
You need to look at the building regulations approved document H 
Is covers drainage for commercial buildings.
Paste your question in Google AI mode to find all the required links and answers to the questions you are asking.
Regards

Will · Answer

You could most likely pipe the new toilets into the existing waste providing you have enough fall on the pipework and you have a sufficiently sized stack pipe in situ

Gavin · Answer

short answer yes and usually when it gets to that much a good suggestion is to have a sub - stack with an AAV ( air admittance valve)

Samuel · Answer

Possibly. It would depend on the location of the 2 additional toilets, if they’re past/ away from
The original 2 then yes. If they’re before then you
Could tea straight into the original waste pipe.

Martin · Answer

Ideally, you’d want the new toilets to have their waste pipes becoming external at the closest source possible. However it is possible for them to feed into the waste piping and drains if the existing toilets below.

Installing additional toilets

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