For Yakisugi, cedar boards made from large-diameter logs that are difficult to use as structural columns are selected.
Specifically, logs that yield boards approximately 22–30 cm in width are used.

These logs are chosen from sections cut close to the base of the tree at the time of harvesting, and only those with good grain quality and sound condition are selected.

At Kyoei Lumber, we primarily use cedar sourced from Kuma Kogen Town in Ehime Prefecture, a region known for its cool climate.
In this environment, cedar trees grow slowly over a period of approximately 50–60 years, resulting in tight growth rings and a fine, dense grain pattern.

In addition, cedar from this region is characterized by heartwood with a soft pinkish tone, which is another distinctive feature of the material.