I'm going to drill a couple of holes in a tiled wall in my bathroom. Is it best to drill through the seams or the tiles? Should I avoid vertical or horizontal seams, or does it really not matter?
The holes are for a shower riser (i.e. just a couple of screws with plastic wall plugs/dowels). These look like the plain old ceramic tiles, and they have cracked where they were drilled through by whoever installed the shower.
P.S. I'm aware of the possibility of drilling through a water pipe; will take the necessary precautions.