The header above the sliding glass door from the Master Bedroom to the raised deck sags. It is not a big difference but sufficient to be noticeable and to allow water to run over the top of the gutter rather than running to the downspout at either end, during a heavy rain. The house is on a full poured basement with a walkout frame wall area immediately below the bedroom. A sliding glass door in the basement room is partially below the slider in question. There is insufficient wall above the bedroom slider to put in a taller header. Is there a way to fix this without replacing the slider with a narrower walk out door and siding over part of the opening? I have sandwiched steel plates to headers in similar situations but in this case there is only about two inches clearance between brick mold and soffit.