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| Negative Uplift |
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NEGATIVE UPLIFT
is the pressure created on a roof as high velocity wind passes
across the surface. The BaySystems/GE SPF 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 BaySystems 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 BaySystems SPF Roof System. Period! |
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