suitsuki arizan　吸付蟻桟

KEY WORD :　architecture / joints

Also arizan 蟻桟, suitsukizan 吸付桟 or suitsukiari 吸付蟻. A long, narrow dovetail tenon *hozo ほぞ with a corresponding long mortise *hozoana ほぞ穴. The joint is set at right angle across the back side of large ceiling boards, the under side of floor boards, on top doored shelf boards, tenbukuro 天袋 etc., to prevent warping or separation. A long suitsuki arizan can be cut with a dovetail mortise into which a long dovetail tenon is inserted. It can be used to create a finish on the edge *hashibami 端喰 of a shelf board and used to make a double ceiling nijuu tenjou 二重天井. To create a double ceiling long dovetail tenon is imbedded halfway into the reverse side of the visible ceiling. Another ceiling made of thinner boards is supported by the flat bottom part of the dovetail tenon. The upper invisible part of the double ceiling is called notenjou 野天井.

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