Patent ID: 9732524
Date: 2017-08-15
CPC Classifications: B32B,C04B,E04C,Y02W,Y10T

Claim:
1. A building article comprising: a plurality of thin film overlaying fiber cement substrate layers, wherein each of said overlaying fiber cement substrate layer is bonded to an adjacent overlaying substrate layer, the fiber cement substrate layers together forming a single fiber cement matrix wherein said fiber cement matrix comprises an air entrainment agent; a first plurality of filler particles having a first density and incorporated in the fiber cement matrix, wherein the first plurality of filler particles comprises about 0.1%-5% by volume of the fiber cement matrix; a second plurality of filler particles having a second density and incorporated in the fiber cement matrix, wherein the second plurality of filler particles have an average density less than the average density of the first plurality of filler particles; and a plurality of air voids formed by the air entrainment agent defined by air pockets entrained in the fiber cement matrix such that the air voids are formed directly in the fiber cement matrix with no material separating the air voids from the fiber cement matrix, wherein the air voids comprise about 3%-20% by volume of the fiber cement matrix, wherein the air voids are closed cell and have an average diameter greater than 20 microns, and wherein the air voids are uniformly distributed.