One new detail is BUR-24S, "Mop- or Cold-applied Base Flashing
at Through-wall Scupper." Scuppers provide an outlet for water from
a parapet wall and are a source of drainage. They can discharge
water into a conductor head and downspout, discharge directly into
a gutter or be extended to allow unrestricted discharge of
BUR-24S shows a two-piece scupper constructed with sheet metal.
The scupper piece located inside the wall is referred to as a
scupper liner, and the other piece is an exterior closure flange
installed on the wall's outside face. The top and sides of the
closure flange are formed to accept sealant; the bottom flange is
locked to the conductor head. The top of the conductor head should
be 1 inch below the base of the scupper, and NRCA recommends all scupper joints be
soldered or welded. In addition, the scupper assembly should be
secured to the wall and deck or...
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