As a result of studying major books on carpentry techniques, three conclusions were drawn concerning methods for determining the depth of eaves.
1. It is evident that the depth of the flat part of honshige-taruki eaves with hip rafters where the rafter interval equals the standard rafter interval was determined based not on the so-called rafter interval system(shi-wari system),but on the method of designing eaves (HIKIKOMI-TARUKI).
2. There were two ways of determining the depth of eaves.
3. When using the method of designing eaves, there are OLD method and NEW method.
