| 摘要 |
PROBLEM TO BE SOLVED: To prevent corrosion of a sheathing roof board and a rafter by arranging an engaging groove for supporting a roof part heat insulating material by airtightly engaging with an edge part of the roof part heat insulating material in the lengthwise direction on a side surface, and arranging plural air vents in the side surface being the sheathing roof board side from the engaging groove. SOLUTION: An air permeable rafter material 1 is used in a roof structure of a building such as a house, a roof part heat insulating material 5 is curved, and an edge part 5a of the roof part heat insulating material 5 is engaged with an engaging groove 2. Since the edge part 5a of the roof part heat insulating material 5 airtightly engages with the engaging groove 2, there is no need to arrange a clearance filler between a rafter material and the roof part heat insulating material, so that execution work is facilitated. Since plural air vents 6 are provided in a side surface 3 of an upper side part 1a being the sheathing roof board side from the engaging groove 2, a gas permeable layer is secured in a space between a sheathing roof board and the roof part heat insulating material 5, air flows by the gas permeable layer, and moisture hardly gathers to thereby prevent corrosion of the sheathing roof board and a rafter as well as to facilitate execution work of the roof part heat insulating material.
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