new toilet to main stack question

4 Jan 2009
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United Kingdom
Putting in a new loo on the same wall as the ouitside main stack and about 4m from it. between the loo and the stack is a 'between floors' stairwell window I have to avoid.

So my question is:

Do i drop vertically from the toilet 1.5m then run 2.5' to the main stack and use a 92.5' joint in the main stack

OR run at 30' to the horizontal and use a flexible joint to join to a 92.5' joint in the main stack.

Next question is do I then 'T' the shower and basin waste to the new branch (they are located betwen the toilet and the stack) or it is best to run to the main stack separately?? If to the new branch and I'm runnign it at 30' then the waste pipes will have to be 30' to the vertical to get then in the soil pipe square...



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No one have any thoughts??

Is it better to drop vertically to a gentle fall to the stack or steeper fall all the way??
I'd go with the 30deg option, using a 90 could prove noisy when the contents of the pan hit the bend on the way down.....

You can tee the wastes into the branch of preferred, odd angles can be overcome by angling the pipe where it exits the wall then use aeither a 90 or 45 deg bend just before entry to the stack.

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