12 x 12 is a little deceptive, as it is 12 ft to the metal rings that attach to the wall. Your shade space is much smaller. Just put this up recently in time for several very windy days. With all the twisting, the toggle  bolts loosened and one end came loose. Hit my peach tree and knocked off every peach. We attached one side to the house (one story) which isn't  high enough to walk under, but ok for sitting. Ok if you are aware of what you are getting.