I have had the same problem with my window. The metal piece is over every window and they still leak. I have two large domer windows on either side of the house and they both have sustained a large amount of water damage to the drywall. I have contacted the contractor and an attorney and the windows still leak after a number of attempts to stop them. My house is three years old and this has been an on going thing. Good Luck in getting the contractor back to fix the leaks.