This paper deals with the correlation between main frame and roof frame of timber houses at Rokuseicho, Ishikawa prefecture, analyzing quantitatively the route of load transfer from roof frame to main frame. It revealed that the average height of the route shifted upwards in main frame. In case of thatched roof, the process of expanding openness to the side of frame appeared in transformation of main frame. In case of tiled roof from the beginning,the arrangement of various type of beams has been developed either to show pile of beams or to expand openness upwards within main frame.
