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This invention generally pertains to a composite building material comprising a lightweight core with a thin fiber cement facing on one side of the core and a second facing material on the other side. The fiber cement facing that is used on at least one of the faces of the building material is 3/16″

This invention generally pertains to a composite building material comprising a lightweight core with a thin fiber cement facing on one side of the core and a second facing material on the other side. The fiber cement facing that is used on at least one of the faces of the building material is 3/16″ or less, more preferably ⅛″ or less. The green fiber cement facing is preferably formed by a slurry-dewatering process to form a sheet that is in a plastic, uncured, state prior to manufacture of the composite. The composite building material is assembled in an uncured state and then cured.

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1. A building material, comprising:a first component, wherein the first component comprises a pre-formed fiber cement layer having a density of between about 53 to 115 lb/ft3 and a fiber content between about 5-12 wt. %; a second component positioned adjacent the first component, wherein at least a

1. A building material, comprising:a first component, wherein the first component comprises a pre-formed fiber cement layer having a density of between about 53 to 115 lb/ft3 and a fiber content between about 5-12 wt. %; a second component positioned adjacent the first component, wherein at least a portion of the components forms interpenetrating mechanical and chemical bonding with the other components; and wherein the fibers of the first component extend in a substantially planar orientation substantially parallel to a surface of the pre-formed fiber cement layer. 2. The building material of claim 1, wherein the first component is reinforced with individualized cellulose fibers, wherein at least a substantial portion of the lignin components are removed from the fiber cell walls.3. The building material of claim 1, wherein the thickness of the first component is less than about 3/16 inch.4. The building material of claim 1, wherein the density of the first component is higher than the density of the second component.5. A building material, comprising:a first component wherein the first component comprises a pre-formed fiber cement layer comprising about 5-12 wt. % cellulose fibers, wherein the cellulose fibers of the first component extend in a substantially planar orientation substantially parallel to a surface of the pre-formed fiber cement layer; and a second component positioned adjacent the first component, wherein at least a portion of one of the components is bonded to the other component. 6. The building material of claim 5, wherein the second component is made of a curable material.7. The building material of claim 6, wherein at least a portion of the second component penetrates the pre-formed fiber cement layer so as to form mechanical and chemical bonding therebetween.8. The building material of claim 6, wherein at least a portion of the second component extends into the capillary network of the pre-formed fiber cement layer so as to reduce the permeability of the pre-formed fiber cement layer.9. The building material of claim 5, wherein the second component is fiber reinforced.10. The building material of claim 5, wherein one of the components at least partially surrounds the other component.11. The building material of claim 5, further comprising a third component provided adjacent said first component such that the first component is located between the second component and the third component.12. The building material of claim 5, wherein the fibers contained in the first component are selected from the group consisting of natural inorganic fibers, synthetic fibers, engineered fibers, cellulose fibers, and combinations thereof.13. The building material of claim 5, wherein the second component is a fire resistive material.14. The building material of claim 5, wherein the fiber cement of the first component is pressed.15. The building material of claim 5, wherein the fiber cement of the first component is embossed.16. The building material of claim 5, further comprising a sub layer between the first component and the second component to improve bonding therebetween.17. The building material of claim 5, wherein the second component is a lightweight core having a first side and a second side, and the first component is a pre-formed fiber cement facing on at least the first side of the core.18. The building material of claim 17, wherein the fiber cement facing wraps around both the first side and the second side of the core.19. The building material of claim 17, wherein the core is open.20. The building material of claim 17, wherein the core is homogeneous.21. The building material of claim 19, wherein the core has a honeycomb configuration.22. The building material of claim 5, wherein the building material is a single plank.23. The building material of claim 5, wherein the building material is trim board.24. A building material, comprising:at least a first component and a second component provided adjacent said first component, wherein the second component comprises a lightweight core having a first side and a second side, and the first component comprises a pre-formed fiber cement facing on at least the first side of the core, wherein the core includes a plurality of vertical symmetrically opposed corrugated core layers.