Standard aluminium decking systems offer good usability; however, they don’t have any drainage capabilities so all water goes directly below onto the substructure. This can cause issues with the substructure and fixings longer term. Also, this is not ideal in open-frame balcony scenarios where it drains below!
A full-seal aluminium decking system has inbuilt drainage that protects the structure and joists whilst also channelling all water runoff to the same point for a controlled outflow. A proper full seal decking board will have channels inbuilt rather than slotted-in drains, which are hard for installers and not as effective.