This detail illustrates a masonry window sill condition in an anchored stone veneer wall. The concrete masonry backing is treated with blocking at the perimeter of the opening which is wrapped with transition material, which in turn engages with the air/moisture/vapor barrier in the field of the wall providing continuous resistance to air and moisture. Continuous insulation offers excellent thermal control. The detail incorporates a vertical expansion joint in the stone veneer and a vertical control joint at the block backing. A system of flashing and weeps below the sill allow moisture to exit the drainage cavity. The rigid thru-wall flashing material is self-supporting across the cavity. The flashing returns vertically at each end termination to form an end dam. The durable drip edge guards against moisture reentry and may be notched to avoid excessively thick laps. The person using this detail shall be responsible for its complete design and proper application.
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