I'm planning to put a safety bar in each shower and will have to drill through the Mexican tile on the walls to hit studs, but my stud finder won't work through tile. I am not going to assume that the builders got the stud centers right as I measure on the regular exposed drywall and move along that wall into the shower. My thoughts are that as long as I put the bar on a wall with access from the other side, I will measure carefully on the back side to be sure the studs are correctly place (in one instance, a closet wall, the other may be more challenging, it is the heat pump closet) and be sure that I have identified the studs on the drywall side, transfer the measurements to the tile side, then make my holes.

Stud finders sound like a good idea, but you still need your wits about you when trying to track down a few illusive inches of wood, know what I mean?

SRS