Page 167 - Construction Waterproofing Handbook

3.56 CHAPTER THREE
cured. Deck coating requires knowledge-
able, trained mechanics for applications,
and manufacturer’s representatives should
review details and inspect work during
actual progress.
Figure 3.46 demonstrates proper deck
coating application, and Fig. 3.47 demon-
strates the various stages of deck-coating
application.

CLEAR DECK
SEALERS

Although similar to vertical surface sealers,
clear horizontal sealers require a higher per-
centage of solids content to withstand the
FIGURE 3.43 Surface priming after crack prepara-
tory work has been completed. (Courtesy of wearing conditions encountered at horizon-
Western Group) tal areas. Decks are subject to ponding
water, road salts, oils, and pedestrian or
vehicular traffic. Such in-place conditions require a solids content of 15–30 percent,
depending on the number of application steps required. Typically, two coats are required for
lower solids material and one coat for 30 percent solids material. In addition, complete sub-
strate saturation is required rather than the spray or roller application suitable for vertical
installations.
Clear wall sealers differ from elastomeric coatings in much the same way that clear
deck sealers differ from deck coatings. Clear deck sealers cannot bridge cracks in a
substrate, whereas most deck coatings bridge minimum cracking. Clear sealers can be
applied only over concrete substrates, whereas deck coatings can be applied over metal
and wood substrates. Clear sealers are penetrating systems, whereas deck coatings are
surface sealers.

FIGURE 3.44 Typical millage requirements for deck-coating applications. (Courtesy of Pacific Polymers)