What are the logs in traditional wooden buildings in China?

Log, also called sleeper, is a triangular wood between the purlin and the eaves rafters of the wing angle.

Its function is to support the head of the wing corner rafter to tilt upwards. Sleepers are the same length as the eaves frame and the same thickness as the L rafters, overlap with the sandalwood gold plate, and are nailed to the eaves rafters to support the wing rafters.

Because the wing rafters gradually change direction and height along the direction of the small cornice, the upper surface of the sleeper presents an arc parallel to and similar to the curve of the small cornice. In order to catch each wing rafter, a bowl needs to be dug up on it.

To put it bluntly, it is a cushion designed to cater to the change of cornice shape and purlin height.

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