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-   -   Why is the pipe for tub spout supposed to be copper? (http://www.diychatroom.com/f7/why-pipe-tub-spout-supposed-copper-178202/)

Arsinek 04-27-2013 10:34 AM

Why is the pipe for tub spout supposed to be copper?
 
In the instruction to my new shower valve it says to only use copper pipe for the tub spout, what is the reasoning behind this? Im trying to avoid having to have anything sweated, is there a way around this?

Canucker 04-27-2013 10:39 AM

Copper doesn't expand as much as the plastics when it gets warm and stays solid. It'll be flopping around if you don't use copper for that particular part.

Alan 04-27-2013 10:47 AM

Quote:

Originally Posted by Canucker (Post 1168206)
Copper doesn't expand as much as the plastics when it gets warm and stays solid. It'll be flopping around if you don't use copper for that particular part.

No.


If the tub spout has pex used, the flow rate is restricted in such a way that the showerhead will also run when you only intend to have the tub spout running.

Daniel Holzman 04-27-2013 10:55 AM

I believe Alan is correct. The instructions on my Kohler water temperature controller said exactly the same thing, and explained that the inside diameter of PEX was too small, would restrict flow, and would result in improper operation of the temperature control.

Arsinek 04-27-2013 10:56 AM

Quote:

Originally Posted by Alan (Post 1168210)
No.


If the tub spout has pex used, the flow rate is restricted in such a way that the showerhead will also run when you only intend to have the tub spout running.

Thats what I thought it had to do with but wasnt sure. So its because the inside diameter of other pipes is smaller and causes water to flow up the shower?

Can I use cpvc?

rjniles 04-27-2013 11:10 AM

Don't use CPVC but you could use a threaded brass nipple.

Canucker 04-27-2013 11:23 AM

Quote:

Originally Posted by Alan (Post 1168210)
No.


If the tub spout has pex used, the flow rate is restricted in such a way that the showerhead will also run when you only intend to have the tub spout running.

Even if you've run pex to a drop ear overhead?

rjniles 04-27-2013 11:27 AM

Quote:

Originally Posted by Canucker (Post 1168223)
Even if you've run pex to a drop ear overhead?

Don't use PEX for the run up to the shower or down to the spout. Copper is the best choice. The PEX is to restrictive for either location.

Arsinek 04-27-2013 11:53 AM

Im thinking about doing the tub spout with copper using shark bites and one compression fitting.

ddawg16 04-27-2013 12:04 PM

I used stainless steel.....

mj12 04-27-2013 03:28 PM

I have done over a dozen shower/ tub set ups using only pex and have never had a problem. In other people's houses I would only use copper because it is the best way to go.

gregzoll 04-27-2013 03:34 PM

Quote:

Originally Posted by rjniles (Post 1168225)
Don't use PEX for the run up to the shower or down to the spout. Copper is the best choice. The PEX is to restrictive for either location.

Just go from 3/4 to 1/2" reducer at the shower & tub faucet.

best handyman 04-27-2013 04:11 PM

When you solder copper it will be hard and hold the tub spout in place. Pex pipe will move around and the tub spout will move around. Has nothing to do with flow

Arsinek 04-27-2013 08:13 PM

Quote:

Originally Posted by best handyman (Post 1168332)
When you solder copper it will be hard and hold the tub spout in place. Pex pipe will move around and the tub spout will move around. Has nothing to do with flow


So youre saying if you secure PEX it would be ok?

ben's plumbing 04-27-2013 08:29 PM

Quote:

Originally Posted by Arsinek (Post 1168421)
So youre saying if you secure PEX it would be ok?

no no no don't use pex....copper... if you cant solder ,,,use brass threaded nipples with 90 degree elbow...ben sr


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