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You mean like just a sledge hammer and nothing else? Or you mean once you've stitch drilled it into manageable sections?
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Whereabouts are you?
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I did this last year with an old carp pond. Used a pointy chisel thing and lump hammer to make some initial holes and then expanded from there with sledgehammer. Very satisfying but very tiring.
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something like this would probs be a help:
https://www.screwfix.com/p/magnusson-guarded-concrete-bolster-3-4-x-16-/3822vi pulled up an old concrete kitchen floor this way, didn't seem too bad..? but perhaps that's hindsight talking...
hugo7
mespilus
Pantsmaster
hvsds
@dst2
Needs to break up a concrete slab. It's 2.3x2.3m and 100mm thick. Is it going to kill me to do it with a sledge hammer?