On our 2005 Signature the rubber seal that Monaco used between the slide topper housings and the window awnings and the body was allowing water behind the housing and onto the top the of the slide. Sometimes the water would make its way into the floor. Monaco used an inappropriate rubber seal and not the one recommended by Girard.  The seal Monaco used was the same as the seal that runs around the top of the windshield to channel water away. There is no good way to create a watertight seal