I'm in the process of extending my existing single garage tuning it into a double. I've just pored the foundations and about to set out on the brickwork up to the DPC.
The double garage won't have an internal wall, so the current wall will come down at some stage - the question is when.
It would be really convenient for me if I could build the whole of the new external wall, then knock down the internal wall and lay the new floor. Alternatively, I knock down the wall, lay the new floor, carry on building the new external wall.
It would certainly be more convenient for me to knock down the internal wall later rather than sooner, simply because I have stuff stored in the garage. By knocking it down last I can put the roof beams in place on the new garage and have a tarpauline over.
The architect drawings shows the concrete base laid over sand/hardcore, then on top of that is the waterproof membrane and screed layer.
Two things that concern me.
Leveling the floor when you can't get at it from both sides without walking through the concrete, and I'm not sure if the damp-proof membrane that runs under the screed needs to run through into the brick DPC or not.
Any specific pointers around on web sites about laying concrete floors like this?