Background:
- Renovation done on second floor bathrooms with concrete floor substrate
- Changing the layout of the bathroom, so new floor wastes will be core drilled in.
My general understanding is in the case of building a new house, where pipe is laid first, and concrete floor is filled after that, then puddle flange is not needed, as there won't be any gap surrounding the floor waste pipe (is this a correct understanding?).
But what about if I were to core drill a new floor waste into the concrete floor? I'd imagine the new hole and the new floor waste pipe won't be completely sealed (i.e. there will be a bit of a gap), therefore I'd imagine a puddle flange is needed in this case even if substrate is concrete, is that right?
Thanks!