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OK, so I think my panic is over. I found a diagram of how the sub structure of my house was built. I remember them doing this when I would check to see how far they had got. I think you are right Notch7, I probably ended up in the insulation after the screed.

I'd be OK if I struck oil :D Im not too sure as Im not too sure how the house was built. I live on a hill so I know there is a sizable void between my floor and the ground underneath. I didnt know there was insulation under concrete floors. Any builders know if its OK?

Hi, So I accidentally drilled through my concrete floor down stairs twice... Will this be a problem? I was installing some anchor bolts which are now in the holes but Im just a bit concerned I may have potentially damaged some sort of damp proofing or something. Should I be worried? For info...