I've never seen copper waste pipes (aside from the tailpiece from a tub, etc), that must have been a nice installation. Reading up on it, seems the DWV copper has a thinner wall than the tubing used for copper supply lines, so I imagine it might eventually give some trouble (esp if the water's pH is a problem).I thought it was so cool that my present house has 100% copper fresh and drain pipes. Then the drain pipes started rotting out..........
I'm really liking PEX pipe now. Fast, cheap, permanent. I've put in about a dozen fittings and haven't had a single one leak. Much better than my record with sweating copper.
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