Impact Windows: A Few Things You May Want To Know

Design of impact protection

When designing doors and hurricane resistant windows, the key elements are the seal, fixing, laminated glass and the framing system. Taken together, all must support structural loads and cycle impact. The different inter layers and thicknesses have a direct effect on performance during shock loading and cycle. As with any rating system, no individual variable affects the outcome. System performance depends on the performance of all the factors together. Different inter-layers are recommended based on the type of basic window, the average glass size, geometry and design pressure. For example, a typical large-resistant shells (or a window system below 9 meters) system uses laminated glass with an inter-layer thickness of 0.090 inches or thinner if you use a special inter-layer composite type (0.075 Saflex Storm inch thick). A typical large projectile resisting system (or a system of windows over 9 meters) used laminated glass with an inter-layer thickness of 0.060 inches.

 

Design for essential facilities: Protection level E

While most building codes associated with hurricanes are designed to protect homes and businesses during a hurricane, experts also recommend evacuating people. Demanding a standard of performance, known as “Level E” or ASTM E1996 was developed for both the individuals inside and also to protect building when it is not possible to evacuate. However, until very recently, there were not many options available to achieve Level E. Those that were available were so expensive that often engineers would discard the plans. In the early months of 2008, a manufacturer known as Saflex introduced to the market a system of inter-layer that could meet the guidelines of a Level E in just one piece of laminated glazing. The new solution for protection against hurricanes Saflex® Level E uses a combination of the toughest Saflex inter-layer, laminated between two pieces of glass under heat and pressure. The resulting glass piece looks and works like a piece of ordinary glass, but are stronger and even stronger than standard laminated glass. It is convenient and profitable for architects and building owners who demand the highest level of protection.  Go here for more information.