We have an aluminium framed sliding glass door as fitted when the house was built 16 or so years ago. It's double glazed but it would appear that the frame is hollow aluminium. This time of year there can be heavy condensation on the frame to the point where small puddles form on the laminate floor. Has anyone ever tried to insulate the frame on an aluminum door, perhaps by injecting expanding foam or the like? The door's otherwise in good working order so replacing it is probably OTT at this time.