Method of making asphaltic roofing material containing class F f

Details Method of making asphaltic roofing material containing class F f Method of making asphaltic roofing material containing class F f

1994-11-04

1996-10-15

Lusignan, Michael

Coating processes

Solid particles or fibers applied

Roofing produced

427188, 427202, B05D 136, B05D 112

Patent

active

055652395

ABSTRACT:
Asphaltic roofing material, such as roll or shingle roofing, employs Class F fly ash as the filler to the asphaltic base material. The fly ash is readily heated and promotes a more rapid cooling of the composite asphaltic web prior to rolling or cutting into shingles. The Class F fly ash comprises between 40% and 70% of the hot asphaltic mixture, by weight. It may be delivered to the roofing plant in a state of elevated temperature from the fly ash source to reduce the requirement for preheating the fly ash or eliminating the preheating step altogether. The slightly acidic content of fly ash discourages the growth of fungus and mold on the roofing material in hot and humid climates, and the resulting shingle has enhanced overall flexibility and resistance to cracking at low temperatures.

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"Study of Algal Discoloration of Asphalt Roofing Shingles", 3M Industrial Report, Dec. 1987.

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