sorry - it's another hypothetical question ;->
Re: "The Bungalow Project", we've evolved the new plan so that it works much
better WRT to where new rooms will be and also WRT to logistics of doing
The gotcha compromise is that one of the two bathrooms (well, the other is a
bog and shower) has ended up landlocked behind a bedroom. I'd have a
toilet 1.2m away from the external wall.
So I need to bury a 110mm pipe under the floor and out through the wall. No
general problem with any of this, simple straight run under a doorway, the
drains outside are fairly deep and no issues with fall. Assuming that the
wall footings are deep enough (out of the way, to be determined by digging
hold outside) I have one problem to solve:
How do I repair the floor membrane after I've cut a trench about 300mm by
suggests I need to pour a load of "Structural Epoxy Pouring Grout" in,
covering 150mm of the existing membrane on all sides of the cut and
backfill with concrete then screed. Assuming I'd need at least 50mm of the
epoxy, that's an absolute minimum of 16 litres which is coming in to 240
I'm aware that diydoctor are trying to sell their goods, so the question is:
Are there other acceptable ways to repair the membrane? I would have thought
that, after dropping concrete around the pipe level with the existing
membrane, that laying new membrane well overlapping the old, taping and
pouring more concrete would have been sufficient. But I have no practical
experience of DPCs...
Thanks for your thoughts :)
 Bathroom being landlocked allows the bedrooms to have proper windows.
Previous plans have severely reduced window area in one bedroom. I can live
with electric lighting and forced ventilation in one of two bathrooms, but
making a bedroom dark will be much worse.