The Bi Fold Doors drainage tray must then be sealed to the structure along its length and across its ends. Care must be taken to ensure that the portion of the drainage tray that adjoins the jambs of bi folding doors structure are adequately sealed, to prevent water running off each end of the drainage tray and in to the building. When fitting the bifold doors frame to the drainage tray silicon sealant must be gunned as shown alongside to ensure that the watertight joint is created on the inside of the frame. Drainage for bi fold doors is important otherwise the weight of the water will counter balance the door and stop them opening.
