Taruki (垂木) – there are taruki of varying dimensions, where the term taruki is preceded by a noun that describes the kind of taruki — such as “yane-daruki”, which means roofing joist. Roofing joists are typically 45 by 45 mm spaced a shaku apart, though spacing may vary depending on joist cross section and roof slope. Confusingly, they can also be large 45 by 200 millimeter rafters, in cases where there is no further framing, and plywood is nailed directly to them.

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