well thanks for the responses guy. this room is gonna be a finished room the garage does sit underneith it so its not hit by the elements. i just wanted to raise the floor to the hieght of an attached room and insult it i have read these posts and i had a similar idea as to the ones above. i was gonna fill the gaps of the frameing with some sort of insulation ( not sure of all the names of products). i was thinking the stuff i see on the outside walls of new construction the pink stuff lol. i was gonna fasten the frame with tapcon screws and top pff with some sort of plywood the carpeting. any other ideas will be greaty apperiacted.