A device for damming insulation around and away from a heat producing object such as a recessed light fixture is disclosed in its preferred form according to the teachings of the present invention. Specifically, the insulation damming device is formed by the interconnection of one or more insulation...http://www.google.fr/patents/US4400766?utm_source=gb-gplus-shareBrevet US4400766 - Insulation damming device
