Installing bathroom floor waste

Question:
Can bathroom floor waste drain be piped through an external wall and just fed onto a lower roof instead of being fed back into sewer drain??.......... (bathroom is on 2nd level)

Also where can I find details of how to cut and fix a 100mm dia floor waste drain in bathroom?..........is there special fixtures with combined grate and water proof seal ?.......I need to set drain through approx. 20-30mm cement screed set ontop of 19mm cement sheet flooring (Scyon sheets) and also allow for water proof coating and 6mm tiles
thanks :2tsup:


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