My kitchen and dining room both have concrete floors and until last week there was a dividing wall. I've now removed the wall, using a cheap SDS drill, to open it up into one big room.
After removing the blocks and mortar I'm left with a trench in the floor that needs filling. The floor appear to be in two layers, there is one layer of conrete and a second layer maybe 1-2" inches thick on top of that. The dividing wall sat on the first layer, which is why I now have a trench to fill.
The mortar the wall was resting on had some roofing felt type material between it and the blocks, presumably to stop damp coming up from below into the wall.
Do I need to put some sort of damp proofing in the trench before filling in? I can't see any sign of damp proofing between the thin upper layer of concrete and the lower first one, so is it necessary for me to put some in?
TIA