... ,fast speed,beautiful,open space poultry house with steel structure and arched roof house with steel arched roofadvantages:1 ... .no rivet,no beam,no welding,no leakagethe arched frame has no rivet,no beam,no welding,so the ... spacethere is more open space compared with other roof frame,the interior clear height is far more than gable ... arched roof is 1.0mm while normal steel structure frame is only 0.4mm