MPdesign 0 Posted January 30, 2017 Report Share Posted January 30, 2017 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. Click to Enlarge 22.84 KB what are your thoughts? Quote Link to post Share on other sites
Bill Kibbel 77 Posted January 30, 2017 Report Share Posted January 30, 2017 Heat from a chemical reaction. Likely sulfuric acid drain cleaner. Quote Link to post Share on other sites
MPdesign 0 Posted January 30, 2017 Author Report Share Posted January 30, 2017 I doubt that it will, but... Will any other type of plastic pipe work better? Quote Link to post Share on other sites
Bill Kibbel 77 Posted January 30, 2017 Report Share Posted January 30, 2017 Yes. CPVC is often used for DWV and floor drains in industrial buildings. Quote Link to post Share on other sites
John Kogel 35 Posted January 31, 2017 Report Share Posted January 31, 2017 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. [] Quote Link to post Share on other sites
mjr6550 5 Posted January 31, 2017 Report Share Posted January 31, 2017 I am also thinking stress cracks. Quote Link to post Share on other sites
MPdesign 0 Posted January 31, 2017 Author Report Share Posted January 31, 2017 Now that you mention it, there is a white line around the fitting joint on 2 sides that is white - which indicated movement. Quote Link to post Share on other sites
Jim Baird 36 Posted January 31, 2017 Report Share Posted January 31, 2017 Looks also like plain old physical damage, like maybe by the top of a forklift or other kind of lift device. Quote Link to post Share on other sites
werty88 1 Posted March 22, 2017 Report Share Posted March 22, 2017 This could be due to the heat from any chemical reaction. Quote Link to post Share on other sites
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