urgent waste pipe help

Joined
13 Feb 2006
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Derby
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United Kingdom
I am having a move around in my ensuite (new bigger shower and moving sink to another wall, toilet staying where it is). The current waste from the shower and sink run above the floor boards boxed in and feed in to the soil pipe in the main bathroom.
What I would like to do is move the drainage of the shower and sink so there is no boxing in required creating more space in what is not the biggest of en-suites. Can I take the drainage pipes straight out of the outside wall they are on and down to a drain directly below which the kichen sink and washing machine running into? I am only unsure as i have a feeling that these waste pipes need to run into the soil pipe, under building regulations.
Please help as this impacts on design.

many thanks

Jase
 
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You can take them outside provided you have a trapped gulley running to foul waste to run them into. However, dropping waste pipes down a wall does have pitfalls - a major one being that a long vertical run can pull all of the water out of your trap, causing smells in the house. You can get over this by fitting a s,all AAV externally, but this must be mounted in the vertical position before any horizontal or 45º runs.
 
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Air Admittance Valve.

hope im not next to that gully drain when someones having a shower.
 
this is a picture of said gully from the sink and washing machine in the kitchen below.
559773710498c8ee77aadeddb5331993866762b9004a0b42b84423b102ac59d16e88eb95.jpg


do you think it will handle the water from shower and sink above, it is not a power shower it is an 9.5kw electric shower.
 

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