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1 A short strut centered between the diagonal braces *sasuzao 扠首竿, in triangular type roof frame *inokosasu 豕扠首. It adds support to the tops of the diagonal braces where they are joined at the peak and become pointed. A strut like this was usually used when the peak carried a bearing block *masu 斗, or a bracket complex consisting of a bearing block holding a bracket arm. The bracket arm was sometimes a simple boat-shaped one *funahijiki 舟肘木, or sometimes supported three small bearing blocks, commonly called a 3-on-1 bracket complex *mitsudo tokyou 三斗斗きょう. Its purpose was to give enough strength for this type of roof frame to carry the ridge pole *munagi 棟木. Example: Houryuuji *Kondou 法隆寺金堂 (rebuilt 693) in Nara.
2 A vertical roof strut supported by the mainspan beam, called *jouyabari 上屋梁 or *koyabari 小屋梁, immediately beneath the point of intersection of the diagonal braces *sasu 扠首, in thatched vernacular houses *minka 民家, of the Edo period with a sasu assembly system *sasugumi 扠首組. The sasuzuka propped up the diagonal braces and hence, indirectly, the ridge purlin *munagi 棟木, which they carried. Sometimes the sasuzuka was braced by longitudinal and transverse tie members *nuki 貫. It is different from the truss post *udatsu 卯立, which supported the ridge purlin directly and was associated with 'rafter construction' *taruki kouzou 垂木構造. Also referred to as munazuka 棟束.
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