Easy on the caplocks.

No, it's not a common or really recommended practice. I'm sure that it can be remedied pretty easily--it's just a few blocks. It could be the job of either trade, it's just a communication issue. It's the GC's job to make that clear beforehand.

I'd say that it's typically within the carpeneter's scope, but it's the TFer's (through the GC) responsibility to give an indication of where they want additional blocking.