On ThermalTight Panels, the weather-resistive barrier is laminated to the exterior of a rigid insulation board, effectively eliminating an installation step. The Neopor graphite polystyrene insulation contains no blowing agents and is rated at R-4.7 per inch at 75° and R-5.2 at 25° (the manufacturer says the R-value increases as the temperature decreases). The vapor-permeable, nonwoven polypropylene WRB has overlapping flaps that are used to seal the panels together on all four sides to create a continuous air barrier. Panels are 4 feet wide and are available in three thicknesses (1 1/16, 1 1/2, and 2 1/8 inches) and three lengths (8, 9, and 10 feet). brincbp.com
