A masonry setback wall/roof intersection in a steel frame building is shown in Figure 4.8.4
(Turenne). The roof membrane, located under the roof insulation, is sealed to the wall air barrier. A
loop in the membrane is provided at the roof wall gap to accommodate differential movement
between the roof and the wall.
Figure 4.8.4 Masonry Setback Wall/Roof Connection - Steel Frame (Turenne)
Figures 4.8.5 (Burn) and 4.8.6 (Turenne) show intersections between masonry walls and fiat roof
edges in steel frame buildings. In the first case, Figure 4.8.5, the steel beam is in the plane of the
masonry backup. A gap is provided between the top of the backup and the spandrel beam so that
the beam can deflect freely without transferring any loads to the wall. The steel beam is faced with
drywall, and a continuous strip of a flexible membrane is installed along the edge of the deck,
sealing the drywall to the roof vapor retarder. Another strip of membrane is installed over the
drywall and seals the gap at the top of the backup wall.
Figure 4.8.5 Masonry Wall/Roof Edge - Steel Frame (Burn)