Chimney

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I took out a chimney recently, and knocked out hearth to level the floor and filled the gap with a strong mortar. Since then I'm getting moisture rising up where the old hearth was.
I can bash out the mortar, but what would you suggest to DPC the old hearth? How should it be sealed/dpced against the current concrete floor?
Cheers,
 
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My floor also appears to have a copper gas pipe in the concrete. If I start hitting the floor with a breaker, am I correct in assuming the gas pipe is going to become unsafe, or how would you rate my chances of remiving the concrete around it without distorting the pipe?
 
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Isolate the gas from the meter before you start breaking out the concrete.

Wrap the pipe in duct tape before relaying the floor.
 
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You need to replace the pipe as the concrete will have corroded it. Then protect the new pipe.
 
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