i normally don't. However, I'm flooring the attic when done then i'm suspending the ceiling in hall stairs and landing. although very competent in all that I do I am certainly open to being advised on things I do your main reasons for not drilling them? I don't normally incase someone decides to throw a screw through them :S
Ethernet/DAB/HDMI for dvr into master bedroom ( New extension ) TIGHT SQUEEZE!!!!! ill try get photos of the squeeze but im afraid to go up there again..