peculiar question for this forum, but here goes

fellow modders, lend me your drilling expertise

over the christmas i have almost completed the wiring of my living room for wall mounted speakers for my soon to be bought HTPC.

wiring inslide the plaster walls was a pain in my arse, and the odd wall looks like something out of black hawk down, but a qiuck splash of filler and it will be grand.

however i have a BUILDING QUESTION

i also need to run cat 6 cable from downtairs to upstairs. here is the question (and excuse my building ignorance)

if i poke the cable behind the plaster board, and using metal fish tape to push it thru, when i get the the ceiling, do builders run wooden supports around the edge that i would need to drill thru? sorry about how i worded this but my building experience is pretty horrible. i checked google but i an not sure the US site i refernced are safe enough for how houses are built here.

i am hoping to drive the cable into the attic and drop it back down inside the plasterboard walls upstairs.

anyone tried this and know the answer before i begin this mammoth task. i could drill outside and up but i want to avoid this if i can.

also i do need cat6, wireless wont suffice for what i need.

anyone got an suggestions?

thanks

fj