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Soil pipe connections through wall underground

View the thread, titled "Soil pipe connections through wall underground" which is posted in Boiler Advice Forum on UK Plumbers Forums.

Planning drainage for a new bathroom. Assuming that all the falls/gradients are correct is there anything wrong with this plan? Soil pipe from toilet goes through wall below the floor level so that I can connect a shower waste (wetroom so flush with floor). On the other side of the exterior wall is the soil pipe vent (with rodding access) and an inspection chamber where it joins the underground drain pipe at a 90 degree angle.

Been through all the regulations I can find and seems ok but maybe I am missing something?

Drainage-Plan.jpg
 
You could get the shower trap pulling when the toilet is flushed
OK thanks. I've seen a fair few shower wastes connected to the toilet stack though. Doesn't the shower trap take care of this? Does this mean Building Control won't allow it? That it's bad practice or something else?

So shower waste should also go through the wall and connect to the soil pipe outside? What difference would this make to the pulling? It is because it would then be where the vent it?
 
Assuing by trap pulling you mean by siphoning. Sorry I am not great with the terms. So guessing using one of these on the stack would prevent that before the rest bend?

FloPlast Push-Fit 4-Boss Single Socket Waste Manifold Grey 110mm - https://www.NoLinkingToThis/p/floplast-push-fit-4-boss-single-socket-waste-manifold-grey-110mm/22367?tc=QB9&ds_kid=92700055281954505&ds_rl=1249404&gclid=CjwKCAjwgr6TBhAGEiwA3aVuIVC63irfqGFPNW4mWWD0VcKwH3zCq7l1JqojayUgQz2ciq4aqHBWcBoCnzYQAvD_BwE&gclsrc=aw.ds
 
OK thanks. I've seen a fair few shower wastes connected to the toilet stack though. Doesn't the shower trap take care of this? Does this mean Building Control won't allow it? That it's bad practice or something else?

So shower waste should also go through the wall and connect to the soil pipe outside? What difference would this make to the pulling? It is because it would then be where the vent it?

Normally connected into the vent stack as well though

Either that or you need to carry a pipe through so you can fit a auto vent

And yes siphoning the trap out
 

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John Williamson,
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