BlueTex™ 2mm Pro 50" Wide is an EPE foam product combined with 97% reflective pure aluminum foil to REFLECT radiant heat with a glossy bright white interior finish in metal buildings, barns, sheds, garages, airplane hangars, agriculture facilities, etc. They can easily span 4' framing on new & existing construction. Warm or mild climates will benefit from the radiant barrier layer and the 2mm creates an excellent vapor barrier, when installed properly. The foil surface, when installed with a ¼" or more air space, blocks 97% of radiant heat and the foam core helps to stop condensation when BlueTex™ is installed air tight.