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Old 10-10-2012, 11:44 PM   #1
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Plumbing pipe internal diameter


OK if you have been following my other post I am looking to use cpvc to repipe a house. In looking at lowes and hd today, I could not believe the small id of cpvc 1/2 inch. In looking at 1/2 inch galvanized, you would need to use 3/4 inch cpvc to have the same I'd. Does this sound right?

The closest thing on the shelf was plain old schedule 40 1/2 inch pvc, to the original 1/2 inch galvanized which I know can only be used on cold side. Also the tan colored cpvc at lowes and hd, was not scheduled as 40 or 80, why?

Does this sound right?

What am I missing here? Even pex came no where close?

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Old 10-11-2012, 09:23 AM   #2
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As long as you run your main runs with 3/4 and tap off with 1/2" once you get to the supplys you will be golden.
It's been done this way for at least 20 years and works fine.
It would be a total waste of money to use sch. 80 for any plumbing in a home.
May even have to special order all the fittings and pipe it's used so little.
Only time I've ever seen 80 used is when connecting a deep well pump, it's to keep the start up torqe from snapping off the pipe.
I have not used CPVC for many years, so much faster and less joints to use Pex.

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Old 10-11-2012, 09:35 AM   #3
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Plumbing pipe internal diameter


Thanks!

So if you did pex, you would just run 1/2 inch from the manifold, correct? and what size to manifold?

Was at both the big box stores last night just to look at things. Their CPVC was a Tan color and had no schedule number at all on it?
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Old 10-11-2012, 10:12 AM   #4
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The layout of the piping depends on the layout of the house. We don't normally do manifold systems, because they end up being much longer because the houses are so spread out these days.
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Old 10-12-2012, 06:48 AM   #5
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Plumbing pipe internal diameter


Quote:
Originally Posted by digitalplumber View Post
Thanks!

So if you did pex, you would just run 1/2 inch from the manifold, correct? and what size to manifold?

Was at both the big box stores last night just to look at things. Their CPVC was a Tan color and had no schedule number at all on it?
Ayuh,.... I just re-did this house, with a 1" pex home-run, 'n 1/2" branches off it to where ever water is needed...
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Old 10-16-2012, 02:43 PM   #6
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Plumbing pipe internal diameter


Any thoughts about flowguard bendable?

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