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Melting Sanitary line?

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I was told that the water from the above was too hot and this was caused by overheating/melting of the pipe?

This is PVC DWV pipe that they painted black along with everything else in the ceiling.

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what are your thoughts?

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No way hot water did that.

PVC starts to decompose when the temperature reaches 284 degrees F, with melting temperature starting around 320 degrees F. That's from Wikipedia.

PVC pipe can be bent by heating it in a double boiler, so some types will soften at 212 degrees F.

I think Bill is probably correct, or those could be stress cracks from Sumo wrestlers using the crapper upstairs.

[:)]

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