Dear oh dear !!

Do not drill your roof trusses!

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

roof trusses shouldnt be drilled due to their sizes not being large enough they are designed to have no drilling lor damage done just to support the ceiling boards, they arnt meant to be drilled and weakened.