I want to connect a bath and sink waste (38mm) pipe into a short horizontal section of WC waste (100mm)before it goes through the external wall and enters the vertical stack (1st floor). Is this acceptable? What connections do I use? 
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bath waste into WC waste
- Thread starter gaz2
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Thanks, it's low enough, but (newly qualified) Building Control person, when visiting, wittered on about needing to make the connection via a stub stack, which made no sense to me. I mean I know what it is, but what difference does it make? She seemed to be concerned about WC waste backing up the bath waste if there was a blockage. 
Fitting stub stack woul mean cutting through the kithen ceiling - not something I want to do... 
Fitting stub stack woul mean cutting through the kithen ceiling - not something I want to do... The connection would need to come off the top of the horizontal soil pipe not the side
http://www.geberit.co.uk/geberit/inet/uk/wcmsuk.nsf/pages/index
http://www.geberit.co.uk/geberit/inet/uk/wcmsuk.nsf/pages/index
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