![]() Deep glazing pockets and low-friction gaskets allow for thermal movement. This is known as thermally “breaking” the frame.Įven with a thermally broken frame, temperature fluctuations also can cause the metal to expand and contract. Supporting energy-efficiency goals, the interior and exterior surface of the metal framing can be separated and insulated to minimize heat transfer. There is no distinction between glazing materials a wall system with polycarbonate glazing would need to meet the same requirements as one using IGUs.Īluminum framing is the industry standard for most commercial buildings’ window and wall systems, including those featuring CPG panels. ![]() Conversely, a higher SHGC will help bring in solar heat in cooler climates. The solar heat gain coefficient (SHGC) is a ratio of transmitted solar radiation to incident solar radiation in a daylighting assembly, expressed as a number between 0.0 and 1.0.Ī lower SHGC indicates less transmission of solar heat, and usually are required in warmer climates to help reduce cooling loads. Solar heat gain refers to the increase in thermal energy of a space as it absorbs incident solar radiation. In contrast, a U-factor of 0.48 would be typical of a double-pane, insulated glass unit (IGU) of the same thickness. U-value measures the rate of heat transfer and a lower number indicates better performance. On average, a U-value of 0.26 can be expected for a CPG system with a thickness of 25 mm (1-inch). When evaluating CPG window and wall systems’ thermal performance, U-value is used. The insulating and thermal performance of CPG systems keep the unwanted heat outside in warmer climates and the cold outside in cooler climates. Because window and wall systems are constantly exposed to the sun, CPG panels are co-extruded with a layer to resist ultraviolet (UV) radiation and eliminate yellowing. The UV protection repels almost 99 percent of harmful UV rays. ![]() When installation is more efficient, downtime is minimized, allowing building owners and occupants to be more efficient and productive. A 25 mm (1-inch) thick piece of polycarbonate glazing weighs approximately 0.65 lbs./ft 2 compared to 6.25 lbs./ft 2 for an IGU of the same thickness.īecause CPG material is formed through an extrusion process, CPG panels also can be provided at any length, as limited by shipping and handling. Compared IGUs and other heavy glazing systems, lightweight CPG panels require less material for structural supports, less fuel for transportation and less labor. ![]()
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