A method for predicting the unexposed surface temperature of a double-layer wall is proposed based on "inclusive thermal conductivity," which considers heat and moisture transfer and influence of cracks in materials. Fire-resistance tests were conducted on specimens with fiber-reinforced cement siding and gypsum boards overlaid. Inclusive thermal conductivities are estimated based on the temperature of fire-resistance tests results. In order to estimate that unexposed surface temperature of

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... lar double-layer specimen whose thickness of gypsum board layer is decreasing, the number of inclusive thermal conductivities are reduced. Calculations using this inclusive thermal conductivity sufficiently captured the temperature history. A method for predicting the unexposed surface temperature of a double-layer wall is proposed based on "inclusive thermal conductivity," which considers heat and moisture transfer and influence of cracks in materials. Fire-resistance tests were conducted on specimens with fiber-reinforced cement siding and gypsum boards overlaid. Inclusive thermal conductivities are estimated based on the temperature of fire-resistance tests results. In order to estimate that unexposed surface temperature of similar double-layer specimen whose thickness of gypsum board layer is decreasing, the number of inclusive thermal conductivities are reduced. Calculations using this inclusive thermal conductivity sufficiently captured the temperature history.