| 摘要 |
PROBLEM TO BE SOLVED: To give a low radiating performance, a high noise insulation factor, a high sound absorbing power and projection screen function to a roof of a large space building by constituting ceiling members with members having a low infrared ray emissivity, a high sound absorbing power, and good screen characteristics. SOLUTION: Ceiling members 4A of a roof 1 for large space building is arranged with a backing material 10 such as boards on a metal roof member side, a backing film 11 such as a low infrared radiant film is adhered on the inner side of the backing material 10, moreover a sound absorbing material 12 such as high density glass wool is arranged at the inner side, and a perforated low infrared radiant film 13 is adhered to the inner side of a sound absorbing material 12. At the ceiling member 4A, an apparent emissivity can be reduced for the inner side of perforated film 13 and backing film 11, that is, for the large space side. Also, sound passed the perforated film 13 is absorbed by the sound absorbing material 12, further, the punching diameter of the perforated film 13 is made smaller compared to surface area, and surface finishing is performed to make the screen gain characteristics flat thereby securing screen characteristics.
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