Polymer-fiber composite building material with bulk and aesthetically functional fillers

This describes a recipe for making roofing shingles from a mix of plastic resin and various solid materials. It uses one type of solid material, like clay or talc, to reduce the amount of expensive resin needed, and another type, such as fly ash or mineral ores, to give the shingle a specific look. The claims narrow the solid materials to non-toxic, microbial-resistant options with low hardness.