Installed this shed just over a month ago, now both of the walls perpendicular to the two windows are both bowing outwards. These are the only two location in the shed that did not have the "Wall Support Channel". Oversight perhaps by Lifetime, but they provided no additional bracing or support, which causes both of the window-side walls to buckle and bow. (NOTE: nothing is leaning against the walls from the inside the shed that might otherwise cause the buckle/bowing) Spent a lot of hard earned money to buy this shed, would probably had considered alternative's had I known how flimsy the wall are without proper structural bracing and support.