1. Wide span: single span or multiple spans, the max span is 36m without middle column. 2. Low cost and maintenance: unit price range from USD35/m2 to USD70/m2 according to customers request. 3. Fast construction and easy installation: time saving and labor saving. 4. Long using lifespan: up to 50 years. 5. Nice appearance. 6. Others: environmental protection, stable structure, High quake-proof, water proof and fire proof, and energy conserving.