He explains that when aluminum extrusions are shaped into framing for window, entrance, storefront and curtainwall systems, a break in the thermal path is necessary between the interior and exterior surfaces. This thermal barrier reduces the transfer of heat through the aluminum, keeping occupants at their desired, comfortable, indoor temperature and maintaining the structural integrity of the aluminum profiles.
The column continues with a description of thermal barrier types and U-factors. He also reminds readers to check that Division 8 aluminum framing and glazing specifications for U-factor align to meet the specified project requirements as determined by local codes.
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