just curious


Old 01-17-11, 07:34 AM
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Question just curious

i was reading in some of the post here that warn to stay away from CPVC!
can some one give some facts as to why?
i am asking-because i had replaced the 30 year old galvanized piping in one bath with cpvc about 5-6 years ago / i think it was flowmaster brand-with a yellow cement.
am i looking at trouble in the future?
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Old 01-17-11, 11:19 PM
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I haven't heard about any serious issues with CPVC.

I'd use the Search engine in the top right corner of this web page to search for threads that contain the character string CPVC and see if you can find out why someone was advising to steer clear of it. Or use Google to search the web.

But, I suspect that if there were a serious problem with CPVC piping, they wouldn't still be installing the stuff.

Also, if you don't get any answers in here, register and post your question on Terry Love's Plumbing Q&A forum here:
Terry Love's Plumbing & Remodel DIY forum
Terry Love is well known on the internet because of his DIY Q&A forum, and a lot of plumbers post there. If there's any hint of a problem with CPVC piping, then they would be aware of it.

I don't think there is a problem. CPVC has been installed for years, and I haven't heard of any problems with it yet.
Old 01-17-11, 11:43 PM
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CPVC gets brittle after several years, it isn't a serious problem as long as the piping is protected against any sharp blows. CPVC also has a greater coefficient of expansion than copper and so if you use it on hot water you MUST allow for the "growth" from room temperature to the temperature of the hot water. The hangers or straps cannot restrict this expansion or the piping will eventually crack. The third thing is that CPVC has a lesser internal diameter (and consequently less cross-sectional area) than copper so in longer lengths or in critical flow areas you will have a greater pressure drop than the same nominal size of copper. This last can be alleviated by using the next larger nominal size of CPVC.
Old 01-18-11, 07:52 AM
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Why not use PEX instead of CPVC?
Old 01-18-11, 10:28 AM
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Originally Posted by Wayne Mitchell View Post
Why not use PEX instead of CPVC?
the bath walls have been closed up for 5-6 years now.
in the future- i might in vest in the PEX tools.

thanks for the input!
Old 01-18-11, 11:57 AM
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I have read posts here saying that PVC should not be used inside. A practice that was very common here in the years between galvanized and common use of copper. It is of course used only on the cold side. The more expensive CPVC was used on the hot side. It is still used here sometimes. I can't comment on local codes or codes where you are or national codes.
Old 01-18-11, 03:50 PM
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I'll cotinue with what Furd said:

Any long hot lines of cpvc should have expansion joints or loops on them.

I still think that cpvc dosen't have the ultra violet inhibitors in it, which means you can't run it near a window

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