| 摘要 |
PROBLEM TO BE SOLVED: To improve fire resistance by preventing high-temperature gas from being transmitted through an eaves back ceiling material 21 to make an entry into an eaves back space 5, even when a surface of an eaves soffit is exposed to a flame of a fire and the like, while improving cost reduction and workability.SOLUTION: An eaves back ceiling material 21 includes: a plurality of base materials 22 and 22 made of an inorganic material such as a volcanic glass multi-layer board; metal foil 23 that is arranged between the base materials 22 and 22; and an incombustible coating film 26 which is provided on a surface of the base material 22, positioned on the opposite side of an eaves back space 5 during execution of work, of the plurality of base materials 22 and 22, and which has a gas shielding effect. The incombustible coating film 26 comprises a resin, and a layered clay mineral with swelling properties, which swells in water in association with the state of being turned into a coating material.SELECTED DRAWING: Figure 3 |
