Innovations in glazing for large missile resistance for hurricane damage mitigation

David M. Rinehart, DuPont™ Building Innovations

The current glazing practices for large missile impact mitigation for hurricane resistance are primarily based on the use of laminated glass bonded with polyvinyl butyral (PVB) interlayer. This interlayer was introduced in the late 1930’s. Although there have been numerous advances in material science, system design and architecture since that time, glazing practices have remained fairly constant.

The unique requirements for impact protection have only been specified for a little over a decade and many of the initial solutions have been found to have serious shortcomings in practice. New glazing methods have been developed that would allow for more economical glazing installations and higher load-carrying capabilities. These developments will, hopefully, result in a greater number of protective glazing installations with minimal influence on economic conditions.

The basis of the improved glazing method focuses on the current practice that requires the glazing infill to be adhesively bonded to the fenestration systems components. By using structural glazing interlayers in lieu of PVB based interlayers, the adhesive bonding of the glazing infill to the framing systems is eliminated. Additionally, extreme windload design performance is possible from impact glazing infill-- maximizing the allowable performance levels of laminated glass constructions commonly used in the industry. Another innovative application opportunity is in refurbishment of existing fenestration installations. By following these practices, improved impact protection can be achieved.

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