Could be anything. Last weekend I helped a friend renovate his 1950's
bathroom. Behind the ceramic tiles, there were one inch thick cement "tiles"
cemented on a metallic grid that was stapled to the studs. Since they were
roundish and somewhat irregular, there were lots of holes, i.e. the ceramic
tiles had backing on about 80% of their area.

"Norm Dion" wrote in message
...
I'm getting ready to install a safety grab bar on the wall of my shower,
which is lined with ceramic tile.
The house dates to the early 1960's. What am I likely to be drilling
through
between the tile and the wall studs?
What thickness is it likely to be?

TIA