Page 64 - Construction Waterproofing Handbook

2.28 CHAPTER TWO

FIGURE 2.36 Dry-shake application of crystalline cementitious waterproofing. (Courtesy of
Vandex)

● No need for a protection layer.
● Some products have stated capability to seal hairline cracks that occur after installation.
● Most are not harmed in the presence of chemicals and acids, making their application
ideal for storage tanks, sewage treatment facilities, and similar structures.
● Penetrate and react with the concrete substrate to form additional “belt and suspenders”
protection.
Curing installed systems is critical for adequate crystalline growth. The curing should
continue 24–48 hours after installation. Concrete or masonry substrates must be wet to
apply these systems, which may be installed over uncured concrete.
In exposed interior applications, coating installation should be protected by plastic, dry-
wall, or paneling applied over furring strips. Floor surfaces are protected by concrete overlays,
carpet, or tile finishes.

Chemical additive systems
Chemical cementitious systems are a mixture of sand, cement, and proprietary chemicals
(inorganic or organic), which when applied to masonry or concrete substrates provide a
watertight substrate by chemical action. Proprietary chemicals are unique to each manu-
facturer, but typically include silicate and siloxane derivatives in combination with other
chemicals. While the chemicals do not penetrate the substrate like the other cementitious
systems, chemical systems also effectively become an integral part of the substrate after
application.
1
Chemical cementitious systems, approximately 16-in thick, are thinner applications
than other cementitious products. As with all cementitious systems, concrete or masonry