In addition to its standard flat Thermolite panel, the company offers fabricated options to provide additional R-value, customization of the reveal created between the panel face and mullion face, and wrapped edges to create hairline joints between panels in butt-glazed applications. Thermolite U-Max is a 7-ply, rabbet-edge panel that provides increased insulation on the interior face of the panel. Said to increase R-value 100% to 200% more than standard 1-in. infill panels, it is available in thicknesses to 3 1/2 in. overall.