Page 159 - Construction Waterproofing Handbook

3.48 CHAPTER THREE

FIGURE 3.27 Mechanical expansion joint detailing for deck-coating
applications. (Courtesy of Carlisle Corporation)

FIGURE 3.28 Plywood deck preparation for deck-coating applications. (Courtesy of General
Polymers)

Metal surfaces require sandblasting or wire-brush cleaning, then priming immediately
afterward (Fig. 3.30). Aluminum surfaces also require priming (Fig. 3.31). Other sub-
strates such as PVC, quarry tile, and brick pavers should be sanded to roughen the surface
for adequate adhesion. Sample test areas should be completed to check adhesion on any of
these substrates before entire application.
For recoating over previously applied deck coatings, existing coatings must be thor-
oughly cleaned with a degreaser to remove all dirt and oil. Delaminated areas should be
cut out and patched with base coat material. Before reapplication of topcoats, a solvent is
applied to reemulsify existing coatings for bonding of new coatings.