Planning new bathroom waste system, after help

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16 Jul 2012
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Location
Newcastle upon Tyne
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United Kingdom
Hi everyone.

I've just started converting a second floor bedroom to a bathroom/shower room.

Local council have been notified and the BCO has been round for initial site audit.

My question is regarding the waste flow from this room. (I will try and attach a floor plan I have done after this post).

Basically the 110mm waste pipe will run horizontally under the floor boards in the room adjacent the bathroom. Basically this is running next to where the toilet will be.

I plan to run the waste pipe as follows:
WC direct connection to 110mm waste
Shower and sink 40mm waste
Bath on its own 40mm waste.

I also plan install an air admittance valve to prevent the traps from syphoning.

The BCO mentioned that the bath, shower and sink should enter the main waste pipe BEFORE the toilet. I.e the toilet should be the furthest point downhill on the main waste.

The problem is that the toilet is situated in the middle of the room. In an ideal world I would have the waste in the following order (moving downstream).
1) bath
2) wc
3) shower and sink combined

Just wanting to know people's advice on the above.

Also where should the AAV be installed on the waste run. I know it goes on a vertical run and should be higher than the highest item (sink).

Thanks in advance for your help.

Rob
 
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