Why Is The Pipe For Tub Spout Supposed To Be Copper? - Plumbing - DIY Home Improvement | DIYChatroom

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Old 04-27-2013, 08:31 PM   #16
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Originally Posted by ben's plumbing View Post
no no no don't use pex....copper... if you cant solder ,,,use brass threaded nipples with 90 degree elbow...ben sr

I finished it today. I was just curious.


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Old 04-27-2013, 08:32 PM   #17
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Originally Posted by Arsinek View Post
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?
You can get valves for iron pipe, copper or pex. But usually only the iron pipe style is available at the box stores. They are more universal for homeowners.

If you buy a tub/shower valve configured for pex- only the H&C supply ports will accept pex. The outlets to the tub and shower will be sweat connections. This is because the manufacturer does not want pex ran to the tub and shower. The reason why has already been stated- it constricts the flow and is not rigid. It is acceptable by some plumbers to run pex to the shower head though.
You can also use brass or galvanized pipe to the tub spout, but then you'll probably need a different tub spout when it comes to trim out time because the one you have is probably for copper
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Old 04-27-2013, 08:33 PM   #18
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Originally Posted by best handyman View Post
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
It has nothing to do with the pipe moving around as both tub spout and shower are installed using drop-ear 90's which are screwed to the wall for support. It has everything to do with flow, it's called the "stacking" effect. Using pex and pex fitting for the tub spout you open yourself up to a situation where the flow exiting the diverter valve is greater then the flow able to exit through the tub spout. Thus the water "stacks" and rises up and out the shower head.

If you are uncomfortable with soldering, just use copper and sharkbites.


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