Building article, typically roofing panel, with pre-determined density and ratio of moduli of rupture to elasticity

摘要

A durable, "nailable", lightweight and fire resistant fiber cement article is disclosed that can be a cost-effective substitute for conventional building materials is provided. The fiber cement article can be profiled to resemble a roofing article such as a wood shake or slate. The fiber cement article incorporates a hydrophobe and a viscosity enhancing agent that are each selected to control the rate of hydration of the binder. The fiber cement article is durable, is "walkable" and "nailable" without cracking during installation and maintains walkablilty after exposure in service.