In order to withstand both wind forces and impact from windborne debris, window and door manufacturers have developed products with both sturdier frames and laminated glazing that is impact-resistant (Figure 4-11). Such systems are available in a variety of styles, options, and costs. While impact-resistant openings offer deployment-free protection, the glass can still be broken, but remains in the frame. These products are often available to the consumer through home improvement stores. Professional installation is highly recommended in order to insure that proper attachment of the windows to the structure is achieved. Figure 4-11: This attractive window can be fitted with energy-efficient glass, impact-resistant glass, or both. The impact resistant glass consists of a laminate or film sandwiched between two glass panes. The frames are reinforced and the hinges have extra fasteners to withstand high wind events. During a wind event, debris may crack the glass, but the laminate will hold the window pane together in the frame and prevent breaching of the wind- and rain-resistant envelope. After the storm, the glass will need to be replaced.
4.2.8 Plastic Honeycomb Panels A relatively recent and positive development in providing the consumer with more options for window protection is the introduction of plastic honeycomb panels made of polypropylene. These panels are installed like plywood and have many of the good properties of regular plywood, with fewer disadvantages. The panels are white and translucent. The honeycomb panels also come in a clear plastic version that lets light through. This is an attractive option to other protective systems, which can significantly darken a house when they are in use. However, these panels are more expensive than the opaque version. 4.2.9 Window Film An after-market product used to enhance glass breakage characteristics is commonly known as security window film. Such products are often called “hurricane film� or something similar. These claims cannot be substantiated by testing. Application of any of these window films to existing windows does NOT constitute adequate opening protection and should not be considered for use as opening protection. For more information, visit the website of the International Window Film Association (IWFA): www.iwfa.com.17
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