OlAg2001 said:
One side of the shower is against the outside wall. When the shower runs for 10 minutes, we can see the water leaking outside - between the bricks and foundation.
If that's the case, I would insist that they rip the shower out and start again. It's one thing to have a waterproofing/vapor barrier issue that could lead to problems years down the road, but to actually have water flowing out through the bricks means somebody really ****ed up.
Edit 1: Are you inside city limits?
I ask because it sounds like they may not have sealed your shower pan at all. what I mean is where your shower floor meets the vertical wall, there should be something at that plane transition that prevents water from flowing out under the cement board (if they even used cement board). That can be Kerdi, Red Gard, or some other type of waterproofing, but it has to have SOMETHING. I believe most municipalities will require the plumber to plug the shower drain and fill up the pan and prove that it will hold water for 24 hours. It sounds like yours would fail that test in 5 min.
Edit 2: I am making the assumption that they at least connected the drain, but with what you're describing, who knows.