Residential construction heavyweight Lennar is putting serious chips down on its Las Vegas fortunes, with new-home developments springing up across the Nevada desert faster than a tourist can max out at a casino. Rainstorms hit Vegas about as often as visitors go home richer, but waterproofing still matters in the design and construction of decks for all these new homes. Cooper Roofing & Solar, a major Lennar subcontractor, was brought on board to install a waterproofing system from Westcoat Specialty Coating Systems on more than 500 decks this year. The general contractor is betting on Westcoat’s ALX waterproofing system, which integrates acrylic resin/cement blends with a reinforced, galvanized metal lath. A visual benefit is the absence of seams, Westcoat says. The ALX system is installed with three separate applications of a polymer-modified cementitious coating, followed by a sealer coat using Westcoat’s SC-10 Acrylic topcoat or a clear sealer. Standard or custom finishes are offered with the system. The company says the system delivers durability in high-traffic areas with the look of decorative concrete. Recommended uses include balconies, corridors, walkways, stairs and landings. The system is also commonly specified for hotels, condos, apartments and office buildings, and can be used to rehab existing deck systems. The standard system consists of sheet membrane, lath, basecoat, slurry coat, texture coat and standard topcoat. Also offered is an ALX Pro version, which incorporates an additional layer of fiberlath-reinforced membrane to prevent cracking on larger spans of unreinforced substrate.