Roof work using flat rafter is popular in the Taiwan traditional buildings that is quite different to those using square rafter or circular rafter. Because of the regional area characteristics and the better skill of wood technical master, the flat rafters affect the load distribution on the roof eave of wood frame that become an important feature to establish regional building family spectrum for academic study. In this paper the roof eave wood frame of 硬山山门 of the traditional architecture in Taiwan from the periods of the Ching Dynasty to the Japanese occupation period are mainly studied, by going through field survey and morphology, categorization, and documentation. It is found that although originally coming from the Fukan and Guawgton, the flat rafter of the Taiwan traditional building usually has shorter span over roof beams, more transitional components, more wood frame with highly decorative workmanship, shorter hang-over eave, and more complicated wood frame work. Besides Taiwan local technical masters had developed the levering diagonal 虹引 frame which was the important regional styled work.
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