A closed-cell spray polyurethane foam together with a hybrid polyurea-polyurethane elastomeric topcoat have been used to restore the exterior of the Superdome in New Orleans....
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I specify sprayfoam primarily for flat roofs covered with crushed limestone for UV protection and foot traffic. I have yet to find a elastomeric coating that will stand up to both. My last roof project used Bayer foam, crushed limestone and coating on eaves and penetrations. Looks good but time will tell.
Comment from Mark Schmidt, (1/21/2011, 4:06 PM)
This article does not explain the relationship between what can be seen in the photographs (exterior metal panels) and what the article is discussing (spray-applied polyurethane foam).
Comment from Tony De Vito, (1/21/2011, 8:33 PM)
Spray applied polyurethane foam protected from UV with a silicone coating for experior applications is not something new. It has been used on cylindrical tanks and commercial roofs for decades because of its unexceled thermal value and longevity. Now, more than ever, it is being specified and applied because it provide the ultimate in energy cost savings. With an FM Approved, high solids silicone coating as the protective coating, spray applied polyurethane foam exterior applications will outperform other types of systems.
Comment from vishal shah, (1/22/2011, 5:34 AM)
i want guide formulation on water base pu.
and whr will i get the resin in india.Water base pu)
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