This is a residence, not commercial, so the likelihood of 1/2" is certain.
Careful there, Sprucey. Andy can tell ya what type of responses you might get from such a proclamation. Or are you purposely baiting for a visit/tongue-lashing from DW?
I tried to warn the current owner not to buy it.
BTDT, too.......numerous times. They rarely listen, IME. Then again.... their poor decision means income/job security for you.