Invert levels for rest bend that exits straight out the house?

[flanagaj]

If an internal soil pipe comes down the wall and exits the house via a rest bend, is the invert level of said waste pipe governed by the thickness of the floor build up, eg screed, 150mm PIR, 150mm concrete slab, sand blinding, hardcore? Or are those layers irrelevant by the virtue of exiting straight out the house?

 

I am also scratching my head as to how I use a rest bend and Radon barrier to hat on said rest bend when the bend radius is quite large and the Radon membrane is underneath the concrete slab.  This will mean that for the barrier hat to be sitting on the vertical pipe, the invert level is forced really deep.  I had no intention of having to run a deep invert just because of a Radon membrane.

Edited 5 hours ago by flanagaj