A radiant heat barrier may be installed under a wide variety of roofs between the roof supports. In one configuration, the radiant heat barrier is provided in the form of a plurality of boards that are each erectable into a barrier tray having at least one high-reflectivity, low-emissivity surface. The...http://www.google.es/patents/US7874114?utm_source=gb-gplus-sharePatente US7874114 - Radiant heat barrier
