I have an issue mounting French doors. My new French Doors replace an arcadia. The RO after removing the arcadia will leave a gap above the new french doors of 3 1/2". I will fill that with (2) 2x4's nailed to the existing 2x12 header. How do I fill the stucco void created by this 3 1/2" gap, on the outside wall to insure water tightness. It is a Stucco home. There is NO wrap paper under the stucco. They used black papered sheetrock on the outside of the studs, then wire, then stucco.