Acoustical sealant would bed the sheathing that would bridge the interior (2x4) wall and the exterior (2x6) wall around the window opening.
Half-inch OSB Zip Wall sheathing was bedded into sealant around the perimeter of the window opening.
Pieces of beveled siding extending from the dam to the edge of the opening formed a sloped drainage plane.
The tape was folded down the face of the dam and over the bevel siding. The ends of the tape extended 4 inches up the jambs.
The remaining 2 inches of flashing tape was lapped over and adhered to the building paper. Rolling the flashing surfaces improved adhesion.
The lower portion of the jamb flashing lapped over the upturned sill flashing. The inner edge of the tape was positioned to be inside of the window's exterior face.
The head flashing was lapped over the jamb flashing. A small piece of flashing sealed the intersection of the three planes.