With all awnings, but big projections in particular, it is critical that a bracket is always mounted on each side of the arm shoulder within 16”. If your awning has less than two brackets per arm then you must mount one bracket between the arm and the end of the awning with the other bracket in the middle. Secondly the installers must make sure they get 2” to 3” of penetration into the center of the stud with the lags. Thick sheathing or vinyl siding can diminish this depth with the common 4” lags so longer lags may be needed in certain circumstances. Finally you need to be careful if you are mounting to the box framing between floors that you either go through into the floor joist ends or use half inch diameter lags for more bite.