aigaki　相欠

KEY WORD :　architecture / joints

Also written 合欠. A lap or halving joint. When used at a corner, it is called a corner lap joint. When used where two members cross each other at a right angle, it is called a cross lap joint. In either case, half the timber is cut from the underside of the other. The result is a perfectly smooth surface where the two members are joined. Lap joints are connected by bolts, nails, or cotters. If the lap joint is used on the side boards of drawers, seen when pulled out, or any other visible place, such as at the corners of chests, the nails etc. are pounded in and covered with dowels. Sometimes wooden nails are used effectively and do not need to be covered. Aigaki tend to be rather weak since half of each part to be joined must be removed. They are commonly used for ground sills *dodai 土台; wall corners; and joins of pole plates *hanamoya 鼻母屋, and cantilevers *hanegi 桔木 in roof construction.

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