yes the shower head plumbing is correct

Thanks Chris. how do I know it’s the right depth?

The thing I don’t get is— how do we know it’s not leaking when they screw the nipples into the “drop ear 90 fitting” since everything is behind the closed wall?

The bathroom walls have been carefully waterproofed but if these faucets aren’t screwed in right, they could leak down the inside of my wall and I wouldnt know it.

Oh, you'll know it alright. Right away.

That is a risk, which is why you use Teflon tape and pipe dope on the pipe threads when you screw it into the fitting.

Bruce

@Joseph Corlett, LLC: how would I know right away if it’s dripping inside the waterproofed wall?

it'll drip down the pipe.

As to depth, shower heads and such aren't that critical to depth. One can always get a longer pipe. Valves are more critical due to attaching the handle.

Most standard shower heads are not critical with respect to depth, since the pipe just screws in and sticks out.

However, I have two bathrooms with Kohler shower rails and they have a fitting/adapter that is only adjustable within a limited range, so the thickness of the wall and distance to the rough-in is signficant. In one shower I had to buy a different length Kohler adapter to compensate for the tile thickness. Not a difficult or expensive purchase, but not planned for as a final step in installing the shower rail.

Bruce