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A structure comprising a softwood-ceiling/hardwood-floor formed of a single set of adjacent boards. Each of the boards including a hardwood layer bonded to a softwood layer, the board having a first edge and a second edge, the first edge having a tongue, the second edge having a groove, the first ed

A structure comprising a softwood-ceiling/hardwood-floor formed of a single set of adjacent boards. Each of the boards including a hardwood layer bonded to a softwood layer, the board having a first edge and a second edge, the first edge having a tongue, the second edge having a groove, the first edge having a first chamfer on the softwood layer, the second edge having a second chamfer on the softwood layer. All boards securely attached to carrying beams that span the walls between two levels within a building.

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What is claimed is: 1. A ceiling/floor structure, comprising: a single set of adjacent boards, wherein each of said adjacent boards includes a two species bonded board having a softwood side and a hardwood side, wherein each of said adjacent boards is formed from a single piece of saw cut hardwood

What is claimed is: 1. A ceiling/floor structure, comprising: a single set of adjacent boards, wherein each of said adjacent boards includes a two species bonded board having a softwood side and a hardwood side, wherein each of said adjacent boards is formed from a single piece of saw cut hardwood directly bonded to a single piece of saw cut softwood, wherein each of said adjacent boards has a first edge with a tongue and a second edge with a groove, and wherein said softwood side forms the ceiling of a first room and said hardwood side forms the floor of a second room. 2. A structure as recited in claim 1, further comprising carrying beams for supporting said single set of adjacent hoards. 3. A structure as recited in claim 2, wherein said carrying beams include at least one from the group including a floor joist and a posted main carrying beam. 4. A structure as recited in claim 2, further comprising walls, wherein said carrying beams span said walls between two levels within a building. 5. A structure as recited in claim 2, wherein said softwood side faces said carrying beams. 6. A structure as recited in claim 2, wherein said set of adjacent boards are secured to said carrying beams. 7. A structure as recited in claim 1, wherein said set of adjacent boards are laid with said tongue in said groove. 8. A structure as recited in claim 1, wherein said softwood side includes a chamfer on two edges. 9. A structure as recited in claim 8, wherein said chamfer has a height of at least ⅛-inch. 10. A structure as recited in claim 1, wherein said softwood has a thickness about equal to said hardwood. 11. A structure as recited in claim 1, wherein each said adjacent board is 1-inch to 4-inches thick. 12. A structure as recited in claim 1, wherein said single layer of saw cut hardwood is greater than %-inch in thickness. 13. A structure as recited in claim 1, wherein said first room includes walls and said softwood is the same species of wood as the walls of said first room. 14. A structure as recited in claim 1, wherein said single piece of saw cut hardwood is directly bonded to said single piece of saw cut softwood by an adhesive. 15. A method of fabricating a board comprising the steps of a) providing a saw cut hardwood layer and a saw cut softwood layer; b) bonding said hardwood layer to said softwood layer with an adhesive to create a two species bonded board; c) milling said two species bonded board to have (i) a tongue on a first edge and groove on an opposite second edge and (ii) a chamfer on said first and second edges of said softwood layer. 16. A method of fabricating a ceiling/floor comprising the steps of: a) providing carrying beams and a set of ceiling/floor boards, each said ceiling/floor board including a two species bonded board having a softwood side and a hardwood side; b) laying said set of ceiling/floor boards adjacent to each other with said softwood side towards said carrying beams; and c) securing each said ceiling/floor board to said carrying beams as each said ceiling/floor board is laid. 17. A method as recited in claim 16, wherein said providing step further includes each said ceiling/floor board having a first edge with a tongue and an opposite second edge with a groove. 18. A method as recited in claim 16, wherein said providing step further includes that said carrying beams span the walls between two levels within a building. 19. A method as recited in claim 16, wherein said providing step further includes that said two species bonded board is a single layer of said softwood bonded to a single layer of said hardwood. 20. A method as recited in claim 16, wherein said providing step further includes that the thickness of said softwood is about equal to the thickness of said hardwood. 21. A method as recited in claim 16, wherein said providing step further includes that said two species bonded board have a first edge and a second edge with said softwood side having a chamfer on said first and second edges. 22. A method as recited in claim 16, wherein said laying step includes laying said set of ceiling/floor boards tongue in groove adjacent to each other. 23. A ceiling/floor structure, comprising: carrying beams spanning between walls of a first room and a second room, a posted main carrying beam for supporting said carrying beams, and a single layer of adjacent boards; wherein each of said adjacent boards is formed from a single piece of saw cut hardwood directly bonded to a single piece of saw cut softwood; wherein each of said adjacent boards has a first edge with a tongue and a second edge with a groove, wherein said adjacent boards are laid with said tongue in said groove; and wherein said adjacent boards are secured with said softwood against said carrying beams so that said softwood forms the ceiling of said first room and said hardwood forms the floor of said second room. 24. A structure as recited in claim 23, wherein said single layer of saw cut hardwood is greater than ¼-inch thick. 25. A structure as recited in claim 23, wherein said softwood is the same species of wood as the walls of said first room. 26. A structure as recited in claim 23, wherein said softwood includes a chamfer on two edges. 27. A structure as recited in claim 26, wherein said chamfer has a height of at least ⅛-inch. 28. A structure as recited in claim 23, wherein said softwood has a thickness about equal to said hardwood. 29. A structure as recited in claim 23, wherein each said adjacent board is 1-inch to 4-inches thick.