Saddle Flashing Detail – Anchored Brick Veneer
CMU Backup
This detail illustrates the special flashing and moisture management conditions required of a low masonry wall and parapet that intersects into a high masonry wall. The low intersecting wall has insulation and air barrier in the cavity which extend up and over the parapet and down the parapet’s back side, tying into the roof assembly for system continuity. The portion of the high wall adjacent to the roof is supplemented with an additional wythe of masonry stepping up at the intersecting low wall to support the subsequent saddle flashing, through-wall flashing, and face brick veneer. The top of the parapet is framed to slope and then stripped in with transition membrane continuing around the supporting masonry of the high wall. The roof membrane extends up the face of the abutting masonry and insulated vertical cover board or sheathing, and a supplemental adhered roof membrane is installed over the entire back and top of the parapet, as well as along the high wall where it is anchored with a termination bar. A one-piece sheet metal saddle flashing, fully sealed or soldered, is then installed over the low wall, supported by the stepped-up masonry at the intersection of low and high walls. A stepped sheet metal receiver with one end dam, fully sealed or soldered, is then installed over the saddle flashing, extending along the entire length of the high wall above the roof line. This receiver also serves as a drip edge to the subsequent through-wall stepped flashing. A metal counterflashing engages with the receiver to protect the vertical leg of the adhered roof membrane at its termination. Face brick may then be installed at the continuous multi-story portion of the high exterior wall beginning at the stepped-up masonry, which defines the location of a vertical expansion joint in the face brick. A metal coping is installed, secured by cleats to resist wind uplift, and sloping toward the roof. Finally, the face brick on the opposite side of the expansion joint may be installed, along with weep vents and optional cavity insert. The brick expansion joint also serves as an isolation joint due to variable bearing conditions of the face brick on either side of the intersecting parapet wall.
