Changing galv to copper for shower.

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DIYGUY

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I will be soon changing my galvanized water supply pipes to copper for my shower in my main floor bathroom. Is there a way to change the pipe to the showerhead without cutting open the drywall? I have not opened the access panel for the bathtub yet. I guess when I do I can look up in the wall and see if the pipe is secured to the studs. I'm hoping I can pre-fab the "L" shaped vertical pipe and short nipple pipe and fish it up the wall without cutting any drywall away.

Any tips would be great.
 
I think you're going to find old pipe/valve support making it hard for you to do this. Repairing drywall is easy compared to the frustration of trying to fish(and fix) something thru a wall...
 
Hello DIYGuy:
May I recommend that you use CPVC plastic pipe for the shower riser? That way you can cut the length of pipe, put a shower ell on the top end (which glues on and has female threads for the shower arm), screw an adapter into the valve, stick the pipe up, glue it into the adapter, go around and screw the shower arm into the ell. The plastic pipe is more flexible to thread through the wall and cemented joints are much easier than soldered joints in copper.
Copper and plastic pipe have been in use long enough to make comparisons between the two now. We have found that water going through a copper ell will eventually erode the copper and cause a leak (the water is trying to stay in a straight line of travel puts more pressure on the back of the ell, plus the abrasive minerals in the water). Meanwhile, CPVC is taking the wear very well and doesn't have any rust or corrosion to battle, also the cement does not burn my hands when it drips on them.
Glenn
 
Your not going to connect copper directly to galvanized are you? It will cause a corrosive reaction and destroy the copper.
 
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