Waterproofing

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POLYUREA COATINGS

Polyurea is an extremely versatile compound, and has been used successfully for waterproofing tanks, parking garages, reservoirs, tunnels, and as a joint filler/caulk.

The latest coating technology is polyurea. Developed in the late 1980s for the automotive industry, this material is now used in a wide array of applications. Use of this material as industrial waterproofing has skyrocketed in popularity in the past decade due to its fast-curing, corrosion- and abrasion-resistant characteristics.

Benefits

  • One reason polyurea coatings are exploding in popularity is the wide variety of positive attributes they exhibit.
  • Perhaps its greatest advantage is that it sets up extremely quickly, allowing the applicator to build up a finished thickness in a single pass. This allows the owner to put the facility back in service many times faster than traditional coatings, saving days or even weeks of revenue lost to down-time.
  • polyurea is a logical solution when seamless, durable membranes are needed for waterproofing.
  • Additional characteristics such as slip-resistant additives and surface textures can also be incorporated. It can be colored, and is even available in a potable-water-approved formulation.

With such a wide range of performance characteristics, the range of suitable applications is also broad. Tank linings, secondary containment and bridge coatings are some of the most popular uses, but the application possibilities are endless.

Installation

Most polyureas used for waterproofing are spray-applied with plural component spray equipment.
It’s typically shipped as a two-part system, with the amine resin blend and isocyanate material supplied in 55-gallon drum sets. Once in use on the jobsite, they are transferred from 55-gallon drums to separate tanks in the spray equipment where they are heated to the appropriate temperature (140°F-160°F). The machine then delivers the isocyanate and polyol resin through heated hoses to the spray gun in a precise ratio (usually 1:1).