PVC vs CPVC

[Herb67SS]

What's the difference. When using as a water supply line, which one is supposed to be used where?

Someone told me that you are not supposed to use PVC pipe as a supply line within 9 inches of a foundation. Anybody know of this and why?

And yes, I would never use either for air. I use copper.

 

[CTyankee]

What's the difference. When using as a water supply line, which one is supposed to be used where?

Someone told me that you are not supposed to use PVC pipe as a supply line within 9 inches of a foundation. Anybody know of this and why?

And yes, I would never use either for air. I use copper.

Not a plumber..but CPVC can be used to supply potable water...PVC is cannot..

 

[Beaumont67]

My work place did a water project and throw out a 10ft. length of green pipe.
- I pulled it out of the dumpster and reused it to connect it to our septic tank, a few weeks ago

Out through the house cement foundation from the basement sump pump pit, was a 3" diameter cooper pipe about ~16 inches long, and I made up a pipe clamp going to the needed 4" diameter...from rubber conveyor belting & two stainless steel TSC clamps.
Also spray foamed the 2 different diameters together, before the home made clamp went on.

I don't know what this greenish pipe is called (??)
- but it had a very good wall thickness and I understand the material can flex some, without cracking

 

[ed_v]

Funny topic... not really... but I just got in the house from digging up my septic system. The pipe that runs from the septic tank to the junction box is that green pipe.

Ed

 

[Beaumont67]

^^^^ Green pipe used here, plumbing septic tank.

 

[Consaka]

When I worked IT for Familian Northwest, I was told that all green pipe was for septic related work. Sorry not sure what it is made out of.

 

[Trey T]

According to wikipedia, the feature in material difference is flexibility or ductility and it's not about potable or non-potable water. PVC and CPVC are accpetable material in public water supply system.

CPVC is better near the foundation bc it can resist better in utility movement

 

[djjsr]

CPVC can be used for hot water.

 

[CTyankee]

According to wikipedia, the feature in material difference is flexibility or ductility and it's not about potable or non-potable water. PVC and CPVC are accpetable material in public water supply system.

CPVC is better near the foundation bc it can resist better in utility movement

CPVC can be used for hot water.

Now I know WHY I'm not a plumber...

 

[G_P]

PVC and CPVC also use different glues to make the solvent weld connection.

 

[Steroblan]

I wouldn't use regular PVC for your house water supply hot or cold indoors if you ever freeze in VA. Make sure to follow code. CPVC is for hot water and uses a hotter glue. You can use CPVC glue for PVC but not reverse. Use PVC outside as a supply line below the frost line. Make sure electrical is not grounded if plastic is used without bonding or tracer ground wire.

 

[jackfork]

CPVC is for hot water and Sch 40 is for cold basically. CPVC is also better when you have high air temps. It is weaker than Sch 40 and needs to be supported about every yard or so. You need to check you local codes on using either of them. I don't have a problem using either for water in a house. If freezing is a issue then insulate them. It's easy and cheap to do. However, when running new lines I now use Pex in almost everything. They handle freezing well, but not sunlight. They also have to be at least 18 inches from a hot water tank.They are much easier to install once you get the hang of it. There is no glue to deal with either which for me is a big plus because I hate the smell. Basic tools are about 130.00 or so to get started with Pex.

 

[Herb67SS]

Thanks to all for the input.

Never considered the Hot vs Cold or the flexibility issues. I do recall seeing entire houses plumbed with CPVC and never understood why they didn't use PVC. Now I know why they used it. In fact, my uncle wouldn't have a stick of copper in his house due to acid level of water, etc. He spec'ed all CPVC in a new house. PEX would have worked but had a bad rep for a while due to deterioration by chlorine in public water systems.

THere are a large number of houses in the area having to replace the copper in walls due to perforation now happening from the acidity of the water. Most of them were built in the 70s.

 

[acer66]

Funny topic... not really... but I just got in the house from digging up my septic system. The pipe that runs from the septic tank to the jution box is that green pipe.

Ed

Funny that this ones up, I also have to unearth the ceptic tank and the pipe soon.

 

[ed_v]

Funny topic... not really... but I just got in the house from digging up my septic system. The pipe that runs from the septic tank to the junction box is that green pipe.

Ed

Funny that this ones up, I also have to unearth the ceptic tank and the pipe soon.

Yeah, it hasn't been kind of ******!

Ed

 

[rlitman]

I now use Pex in almost everything. They handle freezing well, but not sunlight. They also have to be at least 18 inches from a hot water tank.

Really? Because I see PEX used all the time in hydronic heating, which has WAY hotter water than any DHW tank.

 

[Bob-B]

Pex is used all over the place lately around here. The plumber who did my brother in law's work used grey pex for the hydronic heating, blue for the cold water supplies, and red for the hot.

 

[neverenoughtools]

Pex tubing use has been on the rise here in Canada for the last couple of years

 

[Trey T]

sounds like PEX material is becoming pretty economical to have

 

[WV Hillbilly]

CPVC can be used for water ( I prefer good old copper), PVC is used for DWV (drainage, vent, waste), that green pipe for the septic is SDR35, its supposed to be more flexible when used underground than PVC

 

[jeffk14]

CPVC can be used for hot water, but PVC is best suited for air lines in the shop!

 

[volaredon]

huh when I redid all the plumbing under my house ~10 years ago I used all copper.
I recently got put on "city" water and was mandated to have my old well capped-- a story in itself that still pisses me off. I had kept the well active for "outdoor use" watering lawn, washing cars running my steam cleaner/power washer type stuff. So I lost my free water source for outdoor use. I was gonna redo the feed to the 2 outside spigots (all in my crawlspace under the house) in copper too but wow what they want for 1 stick of 3/4" copper these days; unaffordable at present. they disconnected my well from the outside water and tied me into the city water for those feeds...
kinda. I had to finish the job, and I did so in regular PVC at least for now I may redo it in copper in a year or so once I get on my feet again regarding bills and such (been job hopping the last 2 years, and back in school--hopefully done with that mess with my current job)
but being this is a cold water line, and the fact that I put individual shutoff to each spigot in case of an issue/ do that I still have the other spigot to use AND another shutoff "t'd" in, so I can drain the lines from the crawlspace when I shut the outside feed for the winter is using Sch 40 PVC a bad thing in this instance?