... cost,fast speed,beautiful,open space poultry house with steel structure and arched roof house with steel arched roofadvantages:1.low costit has shorter construction ... meters3.no rivet,no beam,no welding,no leakagethe arched frame has no rivet,no beam,no welding,so the roof ... arched roof is beautiful and it has open spacethere is more open space compared with other roof frame,the interior clear height ...