Toilet to main stack question

[virgil]

I'm adding in a new toilet about 4 m horizontally from the main stack. The toilet soil pipe can't run at 2.5' slope to the soil stack as there's a window in the way, but can run at about 30' (to the horizontal) to meet the main stack about 1.5m from ground. The new sink and shower can T into this new 30' soil pipe as they exit between the toilet and soil stack. Soil pipe fittings are either 45' (approx) or 92.5' into the main stack...

My question is: Do I run the new toilet soil pipe with a vertical drop and then 2.5' to the main stack branch (like an L shape), or run it ast 30' as soon as it exits the wall to the stack and then use an adjustable bend to mate to the 92'5 degree main stack joint?

If I do the latter (which seems better to me as greater and more uniform fall on the pipe, I'm going to have to run the shower and sink wastes at 30' to the vertical to join the soil pipe at 90'.

Or am I better off joining the shower and sink separately to the main stack??

There doesn't seem to be any regulation around this...any best practice??

Thanks for any advice.

Virgil

 

[Ermintrude]

Shouldn't be too steep as stops being self cleansing. I would possible tee shower and sink in to stack, run pipe at 1 in 10 and then two 45d bends as close as possible to stack . Avoid 90'd if possible?