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A combined thermal insulation barrier and installation guide for fiber cement siding. A rectangular insulating board has a flat, rectangular back surface, and a front surface shaped to form a number of flat-faced, protruding ridges, aligned parallel to an edge of the rectangle. The cross-section, ta

A combined thermal insulation barrier and installation guide for fiber cement siding. A rectangular insulating board has a flat, rectangular back surface, and a front surface shaped to form a number of flat-faced, protruding ridges, aligned parallel to an edge of the rectangle. The cross-section, taken orthogonal to the ridges has a saw-tooth shape. When a standard-size, fiber cement plank is placed face-down on a face of a ridge with its edge abutting the short face of an adjacent ridge, and a second board is placed face-down on an adjacent ridge, the second board overlaps first board and lies flat on the first board. Once the shaped insulating board is aligned to a required orientation, and attached on a building surface, it serves as a positioning guide for attaching fiber cement boards. Left in the siding, the shaped, insulating board acts as insulation throughout the life of the siding.

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1. A combined insulation and installation guide apparatus for attaching fiber cement boards to a building surface to form an installed fiber cement siding, comprising: at least two shaped insulating boards to be installed on a building surface horizontally or vertically adjacent to each other and le

1. A combined insulation and installation guide apparatus for attaching fiber cement boards to a building surface to form an installed fiber cement siding, comprising: at least two shaped insulating boards to be installed on a building surface horizontally or vertically adjacent to each other and leaving a vertical or horizontal gap between the boards, said boards comprised of a thermally insulating material and comprising:a substantially flat, rectangular back surface;a cross-section, taken substantially parallel to a first edge of said shaped insulating board, having a substantially saw-tooth shape; a plurality of substantially flat-faced, protruding ridges on a front surface, said protruding ridges being aligned substantially orthogonal to said first edge, said ridges being shaped and sized such that when a first fiber cement board of a standard size is placed face-down on a long face of a first protruding ridge with a long edge of said first fiber cement board abutting a short face of an adjacent protruding ridge, a second fiber cement board of said same standard size placed face-down on a long face of said adjacent protruding ridge will overlap said first fiber cement board, with the underside face of the overlap of said second fiber cement board lying substantially flat on the upper face of said first fiber cement board; and a multitude of shaped flashing elements for covering the vertical or horizontal gap between the insulating boards and being made of a waterproof material and consisting of a first rectangle having a short edge substantially equal in length to the width of said short face of said protruding ridge of said shaped insulating board;a second rectangle having a long edge substantially equal in length to the width of said long face of said protruding ridge of said shaped insulating board, and a short edge having a length substantially equal to a long edge of said first rectangle; andwherein said long edge of said first rectangle forms a substantially contiguous join with said short edge of said second rectangle, and the faces of said rectangles are angled to match an angle between adjacent protruding ridges of said shaped insulating boards, such that said flashing is sandwiched between said fiber cement board and said shaped insulating board and held in place without fastening material or overhanging elements and said multitude of flashing elements covers the gap between the insulating boards. 2. The apparatus of claim 1 wherein said shaped flashing element has a width in a range of 0.5 to 12 inches and a thickness in a range of less than 0.5 inches. 3. The apparatus of claim 1, wherein said overlap is in a range of 0.25 inches to 6 inches. 4. A method of attaching fiber cement boards to a building surface, comprising the steps of: a) providing at least one fiber cement board having a length substantially greater than a width;b) aligning at least two shaped insulating boards to a required orientation, said shaped insulating boards having a rectangular, substantially flat back surface and a substantially saw-tooth shaped cross-section thereby creating a plurality of substantially flat faced, protruding ridges on a front surface of said shaped insulating boards, adjacent ridges having a short face of one ridge joined in an angle to a long face of another ridge; and where, in said required orientation, said protruding ridges align in a desired orientation of said length of said fiber cement board; and where the at least two shaped insulating boards are adjacent to each other vertically or horizontally and leaving a gap between said shaped insulating boards;c) covering the gap between the vertically or the horizontally adjacent insulating boards with a multitude of shaped flashing elements, said shaped flashing elements made of a waterproof material and consisting of:a first rectangle having a short edge substantially equal in length to the width of the short face of the protruding ridge of the shaped insulating board;a second rectangle having a long edge substantially equal in length to the width of the long face of the protruding ridge of the shaped insulating board, and a short edge having a length substantially equal to a long edge of the first rectangle; andwherein the long edge of the first rectangle forms a substantially contiguous join with the short edge of the second rectangle, and the faces of said rectangles are angled to match the angle of the joint of the short and the long face of adjacent protruding ridges of the shaped insulating board;d) fixing said shaped insulating board against said building surface;e) positioning said fiber cement board by abutting a long side of said fiber cement board against a short face of said protruding ridges of said shaped insulating board; andf) attaching said fiber cement board against said front surface of said shaped insulating board and to said building surface, such that said flashing is sandwiched between said fiber cement board and said shaped insulating board and held in place without fastening material or overhanging elements. 5. The method of claim 4 wherein said shaped insulating boards are shaped by utilizing a hot-wire method. 6. The method of claim 4 wherein said shaped insulating boards are shaped by molding an insulating material. 7. The method of claim 4, further comprising the steps of fixing a water proof sheet to said building surface; attaching a drainage panel adjacent to said water proof sheet said drainage panel having substantially vertically oriented ridges and grooves on both sides of the panel and fixed to said building surface prior to aligning said shaped insulating boards. 8. The method of claim 4, wherein said flat back surface of said shaped insulating boards further comprise substantially vertically running grooves, each of said grooves being parallel to each other. 9. The method of claim 8 wherein said shaped insulating board has multiple stud markings on the front surface, said stud markings forming vertical lines 16 or 24 inches apart from each other. 10. The method of claim 4 wherein fixing said shaped insulating board against said building surface comprises using one of glue and a strip of double sided tape, or a combination thereof. 11. The method of claim 4 wherein attaching said fiber cement board to said building surface comprises using one of a nail and a screw, or a combination thereof. 12. The method of claim 4, wherein said shaped insulating board is comprised of one of an alkenyl aromatic polymer, a polystyrenic resin and polystyrene, or a combination thereof. 13. The method of claim 4, further comprising attaching an end-piece to said building surface, wherein the end-piece is aligned vertically with the shaped insulating boards and has a saw tooth shaped cross section.