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Discussion Starter #1
Its a mobile home, the drains on the kitchen sink, bathroom sink, and laundry are not connected to the main vent stack. They are vented individually by AAV vents, or undercounter vents. Pics below. They are original to the house and around thirty years old. Can i still use them or do i need to replace them?
 

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I'd replace them if you can afford it. And I'd defiantly replace the PB water lines with PEX.
 

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I'd just leave them.
However there not suppost to be hidden behind the wall, there suppost assessable.
Also I see you have Quest plumbing, there was class action sutes againt them for all the damage done to homes because of it bursting and the fitting getting pin hole leaks. It really needs to go.
 

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Discussion Starter #4
Yes we are planning to rip out all of the PB pipes and replace them, but PEX is a no go. We just plan to put in CPVC. I cant see spending all of that money on the cutter, uncoiler, crimper, etc etc just to replumb supply lines on a small mobile home. If i was a pro plumber maybe but not just for this little job. CPVC is simple, just cut, prime and glue. And the two sinks are out in the open and the laundry one we plan to leave a cutout in the drywall in front it of it so it can get some air.
 

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Just to let you know, the failure of PB was related to chlorine, and the bad connectors and crimp rings they used. I am on a well, and my whole house is still piped with PB and I have no trouble whatsoever. I did replace all splices with shark bites, and I piped a new bath in CPVC, with shark bite couplings to PB.

I have a manifold system with all home runs, which I like a lot.

I personally like copper, sweated, as I don't completely trust connections that depend on an O ring, but I cant use it due to acid in my water.

If your piping is very limited, you are probably best with CPVC, Just wanted to fill you in on PB, which is still extensively used in Europe where they don't legally flouride and chlorinate their citizens. :eek::eek::eek::eek:

PS Id run that vent up through the roof if you can. Anything made by man can fail.
 

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Discussion Starter #6
yeah but thats the thing... the roof doesnt leak. I want it to stay that way. If i go cutting a hole in it, it might start leaking. I cant take that chance.

I have never lived in a house with copper piping. Even the new home my parents had built when i was a kid was built with CPVC. And my water is from a meter because we arent allowed to dig wells on our property, its too close to the city. So, it has fluoride and chlorine in it.
 

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Trailer it would be great if you could go back and add your location to your profile.
 

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Roofmaster
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It remains to be seen how Pex works out. I have to tell you that all those crimp rings give me the willies. Pex is plastic, the fittings are brass, and the crimp rings are copper. We shall see................................
 

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Being mechanical devices, AAVs can fail, though I've never had one do so. If it makes you feel better, replace them. They aren't expensive.
 

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Any I've used are glued on.
Does it get below freezing in your area?
If so CPVC in an outside wall with what little insulation you have is not a good thing. If it freezes once it will burst.
 

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Discussion Starter #15
It does occasionally but not usually below 30. How much insulation should i be using? I got the R-13 for residential use between 2x4's 16" OC

My pipes wont be running through the walls though, they will be running under the floors and im planning to wrap them during installation with that black foam stuff they sell at Lowes.
 
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