hurricane impact doors for Wind Load Construction

For Service and Insulated Coiling Doors

 

The concept of rolling doors designed to withstand wind loads is not new; people building in hurricane prone regions have always struggled with this. However, hurricane Andrew caused such widespread damage that a renewed attention to wind loads was created. The need to require rolling door assemblies that are designed to withstand a load that represents what is expected to occur during a disaster seldom, rather than frequently, is now recognized in many areas. The result has been significant changes to several building codes, most notably, the Florida Building Code. At the same time, overhead door designers have become more aware of design issues and more sophisticated in addressing these issues.

At Cookson, we have dedicated many years to developing and validating analysis methods to help provide the design tools you need to specify exterior door designs with the confidence that they will provide the protection required. Our purpose is to provide a door system that will perform to your specifications and continue to do so for the life of the door.

Heavier gauge slats do not necessarily result in higher wind load capacity for the roll up door assembly. In some circumstances, using a heavier than specified slat gauge causes the wind lock engagement delays, resulting in higher than necessary bending loads on the exterior door slat and higher tensile loads on the wall fasteners. Other door design elements, limiting wind resistance, may be the guide angles or even the wall attachment method.

In today’s environment, wind speed is only one factor needed to design a commercial door system. Many people in the past determined the value of the dynamic pressure that corresponded to a wind speed to drive the design. This is better than nothing, but it does not consider a number of very important variables that affect how much wind force is exerted on a structure.

Our wind load-rated overhead doors take into consideration design load determination, door mounting and fastening methods along with specific door guide gaps.  Cookson is proud to offer one of the top comprehensive product offerings of wind load designed rolling doors in the rolling door industry. 

 

Cookson’s wind load-rated overhead doors are validated through several third-party testing facilities to meet one or more of the following performance criteria:

  • ANSI/DASMA-108
  • ASTM E 330
  • Miami-Dade County test protocols TAS 201, TAS 202 and TAS 203
  • Florida Building Code (FBC)
  • Texas Department of Insurance (TDI)
  • Signed and Sealed Calculations

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Need help?

Wind load ratings and specifications can be complicated. We are here to help. 

If you know only the wind speed and a couple of the other variables for determining the required wind load, the DASMA website has a wind load calculator that determines the approximate psf requirements. This should only be used as a guide.

In order to determine the exact psf requirements, the following variables are required: wind speed (in mph), exposure category, door area, mean roof height, roof slope, directionality factor, surrounding topography, zone, positive or negative pressure and internal building pressure.

 

If you need further assistance, our Architectural Design support team can help you in translating building codes or determining the appropriate wind load. Contact us to discuss your project.