@Mr Chibs Thank you. I can't wait to get stuck into it.
I'm no expert, but I'm guessing a small brick dwarf wall to hold it up. There's a staircase on the other side.
The builder claimed this morning that he was going to take them out. I asked him why he turned my DPC into spaghetti in that case. I can't repeat the reply here.
I'll ask BC what they recommend.
It sounds like the builder had some 120mm Celetex left from another job - I’ve cut down the odd bit in the past, but only a total muppet would try to cut boards in half for the whole floor -anyway the building inspector would never accept that. I’m not even sure 60mm would be thick enough.
Preparing a floor for a new slab is pretty basic stuff, how could he get it so wrong.