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Negative Uplift
Negative uplift is the pressure created on a roof as high velocity wind passes across the surface. The Bay Systems GE Spray Foam Roof System is rated at -495 lbs per square foot uplift which translates to the strongest category 5 hurricane negative uplift pressures. Traditional modified bitumen and built-up gravel roof systems are rated at 1/4 (or less) that negative uplift pressure rating. High velocity hurricane winds inherently cause all traditional roof systems to fail due to the fact that the roof system ‘sits’ on top of the substrate and the high velocity winds literally ‘lift’ the roof system causing failure at the seams and penetrations.

The Bay Systems Sprayed Polyurethane Foam is a two part liquid which comes out of a proportioner nozzle as a liquid, hits the substrate as a liquid and forms a molecular bond with your substrate in a seamless, self flashing, monolithic blanket. Interestingly, the chemical foam rapidly expands and hardens and can be walked on three minutes after application. A GE Silicone base coat and GE Silicone top coat is then spray applied to protect the Sprayed Polyurethane Foam from ultraviolet radiation.

Finally, large roofing granules are spray applied to protect the GE Silicone giving you (3) individual layers of water tight protection. SPF is a unique 3 lb. ‘closed cell’ foam used in marine flotation devices because it does not allow water absorption, penetration or saturation. Water just cannot penetrate a Bay Systems Spray Foam Roof System. Period!