One disadvantage of using steel formwork is its relatively high cost compared to other types of formwork materials. Additionally, steel formwork is heavy and requires special equipment for handling and installation, making it less convenient to transport and set up on construction sites. Moreover, steel formwork needs to be properly maintained to prevent rusting and corrosion, which adds to the overall maintenance cost. Lastly, steel formwork may not be suitable for complex and intricate architectural designs that require flexible formwork systems.