Old Orchard District, Masonry Commercial
The commercial buildings in the Old Orchard district are among the most architecturally interesting, and roofing-complex, in the St Louis County commercial market. Brick masonry structures from the mid-twentieth century have parapet walls with specific flashing requirements: through-wall flashing at the base of the parapet, cap flashing integrated with the masonry courses, and counter-flashing at the roof membrane termination. When any of those details fails on an Old Orchard building, the water infiltration can appear at the ceiling of a retail tenant, in the wall cavity of an adjacent unit, or at the base of the parapet where it meets the building's exterior brick, often not where the actual failure is located.
We inspect Old Orchard commercial buildings with particular attention to the parapet assembly. The flashing geometry on a 1940s masonry commercial building is not the same as on a 1990s suburban strip center, and the failure modes are different. We document each component of the parapet detail separately, cap condition, through-wall flashing where visible, and the membrane termination at the parapet base, because each represents a different repair or replacement scope.


