Page 147 - Construction Waterproofing Handbook

3.36 CHAPTER THREE
Horizontal areas such as copings or concrete overhangs should be checked for ponding
water that may cause debonding and coating reemulsification (Fig. 3.19).

DECK COATINGS

Several choices are available for effective waterproofing of horizontal portions of a build-
ing envelope. Several additional choices of finishes or wearing surfaces over this water-
proofing are also available. Liquid-applied seamless deck coatings or membranes are used
where normal roofing materials are not practical or acceptable. Deck coatings may be
applied to parking garage floors, plaza decks, balcony decks, stadium bleachers, recreation
roof decks, pool decks, observation decks, and helicopter pads. In these situations, water-
proof coatings occupy areas beneath the decks and provide wearing surfaces acceptable for
either vehicular or pedestrian traffic. These systems do not require topping slabs or pro-
tection such as tile pavers to protect them from traffic.
Deck coatings make excellent choices for remedial situations where it is not possible to
allow for the addition of a topping slab or other waterproofing system protection. Deck
coatings are installed over concrete, plywood, or metal substrates, but should not be
installed over lightweight insulating concrete.
Deck coatings are also used to protect concrete surfaces from acid rain, freeze–thaw
cycles, and chloride ion penetration, and to protect reinforcing steel.
In certain situations, deck coatings are not specifically installed for their waterproofing
characteristics but for protection of concrete against environmental elements. For example,

FIGURE 3.19 Reemulsification of coating. (Courtesy of Coastal Construction Products)