Page 78 - Construction Waterproofing Handbook

BELOW-GRADE WATERPROOFING 2.41

FIGURE 2.50 Application process for hot-applied membrane. (Courtesy of American Hydrotech)

TABLE 2.5 Properties of Fluid-Applied Systems
Advantages Disadvantages
Excellent elastomeric properties Application thickness controlled in field
Ease of application Not applicable over damp or uncured surfaces
Seamless application Toxic chemical additives

Cracks over 16-in should be sawn out, sealed, then coated. Refer to Fig. 2.55 for typ-
1
ical detailing examples.
1
At wall-floor intersections, a sealant cant approximately 2–1 in high at 45° should be
applied, followed with a 50-mil detail coat. All projections through a substrate should be
similarly detailed. Refer again to Fig. 2.56 for typical installation detailing. At expansion
joints and other high-movement details, a fiberglass mesh or sheet flashing is embedded in
the coating material. This allows greater movement capability.
Figure 2.57 provides a perspective view of a typical below-grade fluid-applied mem-
brane application using a sheet material to reinforce the horizontal-to-vertical transition.
The detail coat applied at this point provides additional protection at the same transition.
This detail emphasizes the 90%/1% principle, assuming that the weak point in this
structure (wall to floor juncture) is a likely candidate for water infiltration. Recognizing
this, the manufacturer has tried to idiot-proof the detail by adding several layers of protec-
tion, including the waterstop and drainage board that properly completes the waterproof
installation.