Joining 2 toilet waste pipes

Question

My house has a shower room with a toilet and another room with a bath. I want to convert the bathroom to an en suite and add a toilet. The toilets would be on the same external wall about 4 metres from each other. 
Can i join the new pipe to the existing pipe from the outside by simply angling it over 4 meters or should it go into the soil pipe in the floor? If I can angle it is there specifications I need to meet?
Any advice would be appreciated. 

Thanks

Michael · Answer

Yes, the waste can be connected on the outside by joining up to the existing 110mm waste stack waste pipework. Allowing (half a bubble) 45 deg joining into existing stack pipework.

Aaron · Answer

Toilets must always go into a soil pipe or in more difficult places a macerator can be fitted. But when fitting multiple waste outlets to a singular must take into consideration different falls of the pipes and distances as incorrectly fitted can cause negative pressure inside causing suction and removing waters from traps then causing gases/smells

Thomas · Answer

Better go straight to the waste stack.  I've seen something similar.  Sometimes there can be a problem.  You want an opinion, call me, I'll come, I'll tell you. 
All the best 
Thanks 
Tom

Saqib · Answer

Personally, I believe toilet fittings should go into a Soil pipe. However, the waste can be joined outside by connecting the existing waste stack to the waste pipe, using all the correct measurements required for this type of work. 
Hope that helps.

Joining 2 toilet waste pipes

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