[robsradioactive]

Thanks guys!
Only the floor is concrete and steel. The main floor is frame. So with your info, I think there might really be an issue with it.
I remember testing the tubes and replacing a few, but now I don't remember which ones, or if I just did an emissions test or a Gm test. (Not that any tester is 100% reliable.)

I think I'll do some more tube testing and switching out. I'll post back with what happens after that.
Rob