I was tring to hang a mirror in my bathroom but my detector revealed
metal running vertically. Tried a different wall - same story. Tried
putting up some shelving and a pattern began to emerge - I think the
partition walls have metal "studs" or framework.
Looking under the shower tray I can see the metal coming down at the
base of the plaster board at intervals.

I was surprised - is this common in dometic buildings? (this is a brand
new house by a relatively good quality builder). My main question is
whether it is safe to drill into these for support when fixinng
mirrors, shelves etc or is there a danger that they are also conduits
for pipes and or cables. I'm not sure if I would trust the voltage
setting on my detector to find wires behind metal.

Thanks,
AA