ijou koubai 居定勾配
KEY WORD : architecture / general terms
 
Also abbreviated to ijou 居定. The degree of pitch on the underside of a rafter support *kioi 木負 and an eave support *kayaoi 茅負. Because rafters have a concave curve or sag on their upper surfaces, the incline on the underside of the rafter and eave supports is gentler than the curve of the rafters.
 
 

 
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