This paper is a topological definition of framing members for the purpose of comprehending diverse frameworks in Japanese traditional timber houses. Reconsidering the core and outer structure as zoning concept to be appliable to both rafter-framing system and sasu-framing system, zoning and direction of setting members are symbolized and unified horizontally. Focussing on the height of the border between main frame and roof frame in terms of the interrelation among members, three levels of possible arrangement of horizontal members are defined. Using the prefix according to the topological relation of members, the terminology of beams and girders is extracted methodically.
