Abstract: A mineral filler heater assembly for heating mineral filler by directing hot discharge gases from a regenerating system or a thermal oxidizer in heat exchange relation to the mineral filler, and including fluid fuel burners connected to maintain the temperature of the discharge gases above a predetermined minimum, the regenerating system including a modulating damper assembly responsive to the pressure of the discharge gases at the entrance to the heater to control the amount of recycled gases.

Abstract: A method of producing an asphalt roofing composition as well as a novel roofing composition product is disclosed wherein the usual felt base is eliminated. Layers of flowable, viscous asphalt are applied over a moving belt surface and a fiber glass material is introduced between the two layers. In a preferred form, a release agent is placed between the first layer of asphalt applied onto the moving belt surface so as to afford easy removal of the laminated asphalt composition from the belt. The feltless, laminated roofing composition has the advantage of eliminating the use of the usual saturators associated with felt backing type shingles and at the same time affording the reuse of any scrap material.