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Hi there, We laid our lime floor slab just over a year ago. It is 100mm thick. We have been repairing walls and fitting roof windows and now come to partition up our internal space into the rooms we need. We are doing stud walls and need to screw our floor plates onto the floor slab. We expected the lime slab to be more friable when screwed into than concrete so expected to need rawl plugs for the screws. However as we drill into the slab the drill bit is tearing a wider hole than we need and we aren't sure how to resolve it. We need to find a way to avoid that or take a different approach to the partitions altogether. The drill rips the aggregate out of the slab so makes a wider hole than you are drilling for - you don't get a clean hole like you would with concrete. We have tried using a narrower drill bit but the width is still uncontrollable, partly because the drill bit can move around in the hole and partly cos the aggregate is torn out. Also the drilled material is not exiting the hole properly so the depth is spoiled by it falling into the hole also. Bit of a head scratcher at the moment... any sage words from the wise?
