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Hidden roof
The 〔Also sometimes called . ''Koya'' is the technical term for the space between the roof and the ceiling.〕 is a type of roof widely used in Japan both at Buddhist temples and Shinto shrines. It is composed of a true roof above and a second roof beneath, permitting an outer roof of steep pitch to have eaves of shallow pitch, jutting widely from the walls but without overhanging them. The second roof is visible only from under the eaves and is therefore called a "hidden roof" (giving its name to the whole structure) while the first roof is externally visible and is called an "exposed roof" in English and in Japanese. Invented in Japan during the 10th century, its earliest extant example is Hōryū-ji's Daikō-dō, rebuilt after a fire in 990.
==History and structure==
Japanese Buddhist architecture and most Shinto architecture are not indigenous, but were imported from China and Korea together with Buddhism around the 6th century. Climate in Japan being different from that on the continent, several structural adaptations became necessary, the most important of which is the ''noyane'', invented some time during the Heian period (794-1185).
During the previous Nara period (710-794), the structural elements of a roof were considered ornamental and therefore left exposed by design. The rafters supporting the roof's eaves would enter the building and would then be visible from below.〔 Above the rafters would be laid directly the roofing material, for example wood shingles. This is the structure we see at Hōryū-ji's ''kon-dō'' or five-storied pagoda. Because the local climate is more moist than in either China or Korea, roofs had to have a steeper incline to help quicken the flow of rainwater. Due the permeable nature of the walls, and the lack of channelled roof drainage, it was necessary that eaves project far from the walls. On a roof of steep pitch, the wide eaves were also deep, restricting light to the windows and trapping humidity.
The solution devised by Japanese artisans was to construct a hidden roof raised above a ceiling which had non-structural rafters as aesthetic elements. From the hidden roof projected the principal rafters of the shallow-pitched eaves. The structural elements of the outer roof were raised above this, with an outer inclination completely independent of the pitch of the eaves. The earliest extant example of hidden roof is Hōryū-ji's Daikō-dō, built in 990 and was discovered only in the 1930s during repair work.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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