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Burning character is t ics of botanical roofs, which are often used for cul tural assets bui ldings in Japan , have been investigated through a series of experiments. Based on the experiments, sui table f i re detect ing system for such k ind of fires are discussed and proposed. The ra te-of-r ise heat detectors a re installed in the a t t ic , on t h e ceiling and under the eaves , for cultural assets buildings. However, in 30% of fires at cul tural assets bui ldings , fires break out f rom their roofs and those detectors beneath the roofs are not proved to be sui table for the early detect ion of such kinds of fires. For the purpose of ear l ier detection of the roof-fires, a ser ies of f i re exper iments , in which the roofs are ignited f rom outward, are conducted and the ra te of t h e fire spread a re observed. In the exper iments , sensors of var ious kinds a r e ins ta l led and the response of them are a l so evaluated. Those exper iments reveal that fires on the roof surface can be detected i n early smolder ing s tage by smoke detectors with wind, and temperature r ise is only detectable a t a point just opposi te to the fire point a t that t ime. Flame sensor is proved t o be effect ive to de tec t roof-f i res i n very early s t age .

Study On Fire Detection At Cultural Assets Buildings With Botanical Roofs