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I have inherited a 143 year old building. Somewhere in the past someone poured 6 to 8 inches of concrete over top the wood bathroom floor. I really want the weight out of the building. Any ideas on a way to remove it? I expect to replace the original floor when I get down to it. Floor joists are still good and solid, would like to keep them that way.

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    lightweight concrete is sometimes used over top of wood floors in multi-story buildings as a fire break. – Matthew Apr 6 '15 at 21:54
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Rent a concrete saw, make cuts more than halfway through it (preferably within an inch of the wooden floor) in a grid pattern, insert prybar in cuts, break chunks loose. Once you get the first chunk out, pry towards the hole.

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