How to install a floor trap in existing concrete slab?

We are looking at installing an ensuite into the master bedroom as the room is huge, the shower and P trap toilet will be along an external wall so no problems with the pluming there but whats the easiest way to install a floor trap in an existing concrete slab?

also I need an p trap under the floor wast or can I run this straight outside with a flap on the end to keep the vermin out?

Not sure what diameter pipe is required for floor wastes but I was thinking of using the angle grinder and cut two lines 50mm deep from the middle of the floor to the wall then jackhammer this channel out, place the pipe in the channel then screed over the whole lot to get the fall?


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