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Old 07-21-2013, 01:43 AM   #1
DavidW
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Default Mobile Home Repipe

I have an '85 Single Wide. Complete with polybutylene. I've already replaced two joints with Gatorbite. One 90 elbow and the other was a nightmare. A tee failed. It was located over a/c ducting under a joist. I couldn't simply cut and replace with a new tee because of working space and no line of sight to see what I was doing. So I constructed a cpvc tee and spliced that in with 3 Gatorbites. Both were on the hot water. I have well water so chlorine or flourine is not to blame.

Rather than replace each joint as they fail I decided to repipe with cpvc. It's readily accessible here and I'm familiar with it. What I don't know how to do is the union between the supply which is pvc and the new cpvc. Should I make a threaded joint or use the 3/4" pvc/cpvc coupling which is sold at both box stores here.

Can someone recomend a good DIY plumbing book? Something that touches on details like this and other items the might come up like how to hang it and account for expansion.



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Old 07-21-2013, 01:55 AM   #2
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PEX is the best bet for that type of situation, IMO.



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Old 07-21-2013, 02:50 AM   #3
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I would never install cpvc in any potable water system. It is the worst pipe. It will become brittle after a few years and crack and split at joints and stress points. Don't waste your time or money on cpvc it is only good for relief lines. Instead use uponor wirsbo. It will last forever if installed correctly.

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Old 07-21-2013, 09:47 PM   #4
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What sort of time frame am I looking at for cpvc failure? Hot side? Cold side? Both? City water? Well water? Is there a particular brand that you see getting brittle? I have hard well water. I plan an replacing hot first then cold.

If I use PEX there will be a learning curve here.

Plus there are many more questions. The connections seem more restrictive for PEX. I already have low pressure. 40 to 60 psi at the pump slightly less at the taps. Will PEX fittings reduce my pressure and flow even more?

Which fitting system do I use? Which do I look out for? What tools are good. Which tools are bad?

PEX is a hard sell for me. I'm already look at replacing a plastic tubing system with plastics fittings and crimp system that is failing. With another plastic tubing system with plastic fittings and some sort of crimp system. Yes cpvc is plastic and so are the fittings. But right now I trust a solvent weld over a barb and crimp.

With cpvc I don't need special tools over what I have now. I don't have to figure out which parts to avoid. And I already know how to work with it.

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Old 07-22-2013, 02:09 PM   #5
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Wirsbo is not a crimp system. It works on expansion. All cpvc is junk. Wirsbo fittings are not restrictive like other pex systems. Do some homework on it.

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Old 07-22-2013, 03:20 PM   #6
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Quote:
Originally Posted by AQualityPlumber View Post
Wirsbo is not a crimp system. It works on expansion. All cpvc is junk. Wirsbo fittings are not restrictive like other pex systems. Do some homework on it.
Agreed it's a good system but for a DIY the cost of the tools required is something that turns most DIY's off.
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Old 07-22-2013, 08:28 PM   #7
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I agree that CPVC suxs. I was taught old school and always shied away from PEX but another plumber, younger and not as stubborn, finally convinced me to try PEX and it definitely has its uses. I also have done a lot of mobile repipes that had poly and always ran copper but now I'm doing them in PEX. As for the tools u can always sell them afterwards to recoup some of the costs.

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Old 07-22-2013, 11:34 PM   #8
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CPVC is not all that bad it is the most(maybe) used pipe here in Florida. I agree pex would be better to repipe a mobil home. If you live in the deep south of florida cpvc may be ok to repipe a mobil home if you insulate the pipe and replace the insulation and plastic sheeting under the mobil home. We repipe off grade homes all the time with cpvc.

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Old 07-23-2013, 12:45 AM   #9
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Good luck. I'm constantly ripping out cpvc house that are failing.

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Old 07-24-2013, 05:44 AM   #10
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I'm not against PEX. Just the cost of the tools. Learning how to use them. The research makes me feel like I'm chasing my tail.

If I were to go to the Uponor/Wirsbo system it looks like I need something like the Milwakee Propex system. But what I don't know is which fittings and tubing are compatible. Is there a difference between the colors of tubing or is that just to keep things sorted out?

If most of you are going to preach PEX there needs to be a faq somewhere for newbies.



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