Page 405 - Construction Waterproofing Handbook

THE BUILDING ENVELOPE: PUTTING IT ALL TOGETHER 10.7

FIGURE 10.5 Expansion provisions at flashing joint. (Courtesy of Emseal)

building envelope components. Making frequent inspections during all envelope work
ensures quality, watertightness, and cohesiveness. As with all envelope components, atten-
tion to flashing details, only 1 percent of building area, ensures the success of waterproof-
ing envelopes.
Flashings should be installed at vulnerable areas in envelopes and where necessary to
redirect entering water. Typical flashing locations and their basic functions are summa-
rized in Table 10.1. (See Figs. 10.7–10.12)

Flashing Installation
Flashing applied to concrete substrates requires that the concrete be clean, cured, and free
of all honeycomb, fins, and protrusions that can puncture flashing materials. If applied by
mastic, substrates should be clean and dried. Mechanically attached systems require that
substrates be sound to allow anchoring of attachments. Flashings should extend up verti-
cally at least 12 in from the horizontal installation point.