BUILDING PRODUCTS HAVING SMOOTH SURFACE TOPOGRAPHY

Disclosed herein are building products comprising a polyurethane formed by the reaction of at least one isocyanate selected from the group consisting of diisocyanates, polyisocyanates and mixtures thereof and at least one polyol in the presence of fly ash and a non-silicone surfactant, wherein, the fly ash is present in an amount from 40% to 90% by weight based on the total weight of the building product; and wherein, the non-silicone surfactant is present in an amount from 0.5% to 2.2% by weight of polyol used to form the polyurethane. The building products possess desirable surfaces that are substantially free of pinholes, while also possessing a modulus, and other properties, that is comparable to or greater than that of building products substantially free of a non-silicone surfactant. Also disclosed are methods for producing the building products.