| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat insulation building material capable improving heat insulation properties.SOLUTION: A heat insulation building material includes an annular frame part 11 which has a through hole penetrating in a top/reverse direction inside, a top surface plate part 12 provided on a top-side surface of the frame part 11, a reverse surface plate part 13 provided on a reverse-side surface of the frame part 11, an internal space 14 sealed with the frame part 11, top surface plate part 12, and reverse surface plate part 13, a reinforcing rib 15 interposed between the top surface plate part 12 and reverse surface plate part 13 in the internal space 14 and made of synthetic resin, a suction hole 17 formed in the frame part 11 or reverse surface plate part 13 and communicating with the internal space 14, and a plug 2 closing the suction hole 17, and is characterized in maintaining a vacuum or pressure-reduced state by reducing the pressure in the internal space 14 through the suction hole 17. |
