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Am I asking for trouble if I sweat copper that will be under a slab? I have busted my floors up and I have to relocate some of the water lines to accommodate new design. The current pipes are over sixty years old and look pretty good. I think I once read that pipes under a slab have to be brazed. It looks like the original were sweat but I don't know how to tell.
 

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we always had to silver solder any copper joints under a slab. i have repaired leaks under slabs with just regular solder tho. i really didnt have a choice. if you do id wrap some pipe insulation around the joints before covering them up.
 

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if you silver solder then it doesnt matter. i ususllay covered them to keep the soil off the joints if i had to use regular solder
 
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