polymer composite building materials are provided which contain about 30 - 80 weight percent resin , 20 - 70 weight percent fillers and additives , in which the fillers contain at least one bulk filler for reducing the amount of resin needed to make the building material , and at least one aesthetically functional filler for providing the building material with an aesthetic appearance . the bulk filler and the aesthetically functional filler are non toxic , resistant to bacterial attack , and have a mohs hardness of less than about 5 .