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Discuss Waste pipe to main down pipe in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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hello every one, newby here, I've done a bit of DIY plumbing in the past (Trained Aircraft Engineer so use to hydraulic and pneumatic systems) and have a question relating to bathroom waste water going down the main down pipe.

At present the waste water pipe to the main down pipe runs above the floor with a step-down into the main down pipe. I want to run the pipe under the floor (to hide it) which would mean it would be a straight run into the down pipe - is this acceptable ( of course the shower and sink will be fitted with a trap)

Many thanks AD
 
Jon Thanks for the reply, I'll look to see if i can drop it where it goes into the main down pipe
 
which way do the joists run? i'm guessing perpendicular to the pipe.
 
Straight run definitely not mate

Why?
Provided no conflict with other connections and cross flow not an issue. Old copper wastes commonly run straight into cast soil/vent, via brass boss, with no problem after 50+ years. If joists perpendicular to run, that's a different issue.
 
By memory joni , isnt it 18 mm per meter fall on a 110 pipe . I wouldnt run one straight , anywhere .
 
Maybe misunderstanding. My interpretation of straight:- shortest distance between two points.
Not necessary to be horizontal.
Fall on 40mm shower waste pipe :- between 18mm and 90mm/ metre run.( Length not exceeding 3 metres, recommended but not mandatory).
 
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