Connecting Waste into soil pipe, Is this going to work?

[TFGplumbing]

Heya guys Iam currently pricing for a ground floor bathroom in an extention, The bathroom is to comprise of 3 appliances a New btw cc toilet (removing exisitng), a WHB and a shower. Feeling a little bit out of my depth as far as waste pipes are concerned. I have drawn you a basic plan of the proposed bathroom layout and my solution to routing the waste pipes. All my experiance is in heating and gas work so I have come on here to seek your advice!

Is my propsed Idea for routing the waste pipe going to work? or am i going to have to re-think?

 

[Whn1]

Looks fine, how about 50mm for peace of mind, maybe even just to get out of the floor.

 

[SimonJohns]

Looks standard to me

 

[TFGplumbing]

Yes i dont think that would be a bad idea actually. My concern was If the toilet was flushed would it be likely to pull the trap seals out?

 

[TFGplumbing]

The Soil is currently burried in a concrete floor, perhaps my drawing does not illustrate this

 

[SimonG]

Stick an anti syphon trap on the wash basin just for good measure.

 

[Mike Jackson]

Use HepVO valves instead of water traps and there's nothing to suck out. I'd put an access cap where it drops below the floor.


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[Simon F]

what is the height from the bottom of the drain invert to the boss connection,
needs to be 450mm for a standard house, 750mm for over 3 story