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copper water pipe repair

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The framer has put a nail through a copper water line (actually three nails through three pipes) It is new construction, mono-lithic concrete slab ant the nails are 3/4 inch above the top of the slab.
my concern is with a solder repair that close to the slab ,wont the slab wick the torch heat away to fast to provide a good solder joint. or should some concrete be broken out to expose more pipe for better heat transfer and soldering?
The heat transfer could be faster if the pipe has a larger exposure to the solder. Anyway, If you can expose more area of the pipe then it would be better. Some things that are attached to the pipe could absorb some heat so this is not good.


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