Let’s Talk About Design Pressure

The increasing need for updated building codes in Florida has greatly changed design pressure ratings required for high impact windows. Design pressure ratings are essential issues for both homeowners and businesses alike. As such, for safety reasons, all impact windows in Florida must meet updated design performance requirements.

Design Pressure Ratings

Just one good blow to one of your home’s windows from a modest tropical storm has the potential of shattering its glass. Can you imagine what could happen during a hurricane with wind gusts in excess of 150 mph? This is the reason that Florida has put in place various design pressure ratings for windows.

In most areas of Florida, the minimum design pressure rating for high impact windows is 35. However, it can be higher if you live in an area that is considered a high-velocity hurricane zone. In fact, in some areas, the design pressure ratings can be as high as 40, 45 or even 50.

How Design Pressure is Determined

For hurricane impact windows to meet required design pressure ratings, they must meet three different sets of criteria relating to air, structural and water performance. Glass must not show any evidence of air leakage during a 25 mph wind speed. It must also be able to withstand wind pressures up to 142 mph and as much as eight inches of rain per hour driven by wind forces up to 55 mph.

New buildings must obtain a permit verifying that the proper windows are in place. To avoid any problems with building codes, it is always best to ensure that your replacement windows meet or exceed the required design pressure ratings in your area. In this way, you can also be sure that you, your family and your home will be safe during even the worst of weather.

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