I once read a post on this board about a HI that stated he has never tested a shower pan by adding water with a stopper in a shower stall, said he never has and never will. It made me giggle about someones lack of knowledge. He should have done some research on google before making that silly statement.
I just got a call today to test multiple shower pans in a college dorm with my Infrared for a major National contractor that builds commercial buildings. I am laughing all the way to the bank.