Water pressure Fixed copper pipe leaking in foundation now have very little to no water coming out of bathtub spout or shower head

It sounds like the diverter is not fully opening to allow the water to run to the spout. If the diverter is in the wall, perhaps there is a seal in there that needs replacing. If it is in the spout, just replace the spout,

One rule I live by: more parts, more problems. Sounds to me that the plumbing/valves were not insalled properly. If you hired a profesional plumber, have them fix it. I am a licensed profesional plumber and I offer a 1 year warranty on all my work. If the contractor did the work and does not hold a plumbing license, that person is still responsible and may have to suffer legal consequenses.

if you have copper piping,you probably twisted the pipe when,you tightened the spout ,and broke pipe. If you are'nt able to get into the wall on the shower side, cut a hole on the other side of shower wall to repair it.

If you are saying that water is still coming out of the tub spout while the shower is on that is not a big deal a rather normal. If it bothers you a lot then you will need to replace the tub spout as the diverter in the spout has gone bad or is going bad.

Now if you are saying that the shower is leaking behind the wall when the shower head is being used then the threaded joint at the shower head arm is leaking and will need to be undone and put new pipe dope on the threads and reinstall it or it may be just lose and if that is the case remove it and reinstall it anyway.

If the water is leaking behind the wall and the above is not the case you will need to get into the wall and see where the leak is coming from and take the necessary steps to fix it.

Hope this helps and good luck.

Normally the diverter in the spout does just that. It's basically just a little door you pull up to stop water from flowing out the outlet to bathtub, and it diverts water to shower head as it has no where else to go, as the door has been shut. Think of a "T", if you have water coming in, it's going to go out both openings if nothing stopping them, and they are at same level, but when you plug lower one, the water flows up and out the other. My guess is your getting very little pressure from head when it's still coming out at tub.
NOTE: before attempting this, make sure you incoming water supply to house is shut off at valve. Anyway, those spouts are usually held on by a set screw up under bottom side of faucet near back of it, (close to tub) there should be a small slot which will probably be an allen head or philips. You back that screw out, then twist and pull and it should slide off of copper pipe. If no indication under there of a set screw then there are also those that just thread on, which requires you just turn faucet counterclockwise to remove. Replace entire piece all in one, and be done with it. Most hardware or home centers will sell just that separate. Make sure you get the one with diverter. (handle that you pull.) Clean pipe well with steel wool if it's dirty and corroded before sliding new one on, and wipe some "vaseline" on pipe to help and protect "O" ring inside spout. Slide new on on all the way and tighten set screw on underside. If threaded, clean threads, add pipe dope or teflon tape and thread it on until aligned and tight. Good Luck.

if the pipe feeding the tub spout is pex, cpvc or poly then it needs to be replaced with a pipe with a larger i.d. like copper or galvanized or reduce the pressure to the house.

You need to replace the tub diverter/spout. There are two kinds, I hope you have the kind with
an allen head set screw on the bottom side of the spout near the shower wall. These are super
easy to replace ! Loosen the set screw, twist the spout a little and it should slide off. When installing
the new spout, smear some vaseline on the copper pipe sticking out, this will help seal the new O rings in the spout.

The other kind of spout has pipe threads in it. They can be a little more tricky. I got called to a
house one time. The plastic female threads on the spout cracked when the plumber installed it.
The water ran down the inside of the wall and did damage down stairs. The leak could not be seen
until the sheet rock down stairs fell down from being soaked. You need to put some pipe dope on the threads, then tighten the spout on by hand, so as not to scratch it with a pump pliers.

I hope this helps !

The faucet was installed upside down.
The shower riser pipe in the wall is to short( the distance between the faucet and shower head).
One of the biggest problems is if your shower faucet was installed with Pex pipe to the tub spout. Pex pipe will restrict the flow and force the water back up and out of the shower head.
The tub spout must be piped with at least 1/2 brass pipe nipples and fittings, or 5/8 OD. copper pipe and fittings.
Hope this helps, if you further questions please let us know.

id say your tub spout or shower pipe is leaking and running down behind remove both and replace teflon tape see if it stops

The pipe to the tub spout is either restricted or the valve was placedd too high causing some of the water to come up and out of the shower head instead of it all flowing out of the spout.