My 20 ft. x 50 ft. Completely welded all aluminum greenhouse! will never rust and the only bolts are Hilti anchors to the concrete footing. 9 ft clearance inside with a 15 ft peak.
Food production beyond expectations! Super solid structure withstands heavy winds and snow slides off very easily but could handle a heavy snow load no problem! My trusses are only 42" apart so it's built like a tank.