US Patent 11773601 Polymer composite building product and method of fabrication

A building product for application to the exterior of a building. The front face of the product utilizes a first fiber sheet partially embedded within a thermoset polymer coating resin. A foamed closed cell admixture composition core with an inorganic filler overlays the thermoset polymer coating resin with the embedded fiber sheet. The admixture composition infiltrates and bonds to the portion of the fiber sheet that is not embedded within the thermoset polymer coating resin mechanically bonding to the thermoset polymer coating. A second fiber sheet overlays the admixture core and the admixture and second fiber sheet form the rear surface of the building product that is mounted adjacent the building surface.