Periodic Change of the Additional Rafter Tile during the Three Kingdoms and Goryeo Dynasty

Additional rafter tile is a special tile fixed by driving a nail onto the end of additional rafter and is used for double eaves together with rafter tiles. While the rafter tiles are circular in cross-section like the appearance of rafters, the additional rafter tiles are square in cross- section, showing a difference in shape. The shape of the additional rafter tile changes a little, depending on the period, and the pattern is also carved differently. For example, in the case of the Baekje period, the ghost face is carved in a cross-sectional square. However, in the Unified Silla period, the shape of the cross-sectional square remained the same, but the design was changed to lotus pattern (late 7th century) or floral medallion motif (9th century). In the 8th century, the additional rafter tile of the square was changed to rectangle and this shape continued to exist until after the 13th century, the late Goryeo Dynasty. However, in addition to the lotus pattern, chrysanthemum pattern, floral pattern, floral medallion motif, and Ghost eye design are also carved. And after the 13th century, the shape of the additional rafter tile was changed into a trapezoidal shape with a wide upper part, and the design was carved into a complex design of Ghost eye design. Such a periodic change of the additional rafter tile means a periodic change of the end of additional rafter tile. Recently, restoration or repair of wooden buildings has been carried out throughout the country. It is expected that the shapes and patterns shall be selectd correctly in consideration of the periodic change when building the additional rafter tile.