This window sill detail shows a rigid flashing under the masonry sill capable of spanning across the cavity. The flashing forms a drip edge that extends about 1/2″ from the face of the masonry to allow water to escape from the wall. The flashing returns vertically 1″ (min.) or 2″ (preferred) to form a pan, or end dam, where it terminates at the ends of the sill. Weep vents are used horizontally under the masonry sill, at spacing specified. The details shows a vertical expansion joint at the face brick.
01.030.0401: Sill Detail - Masonry Sill, Rigid Flashing
Dynamic 3D Detail