March 13, 2023
Minister certification for plywood underlayment for structural calculations/Sumitomo Forestry
Sumitomo Forestry Co., Ltd. (head office: Chiyoda-ku, Tokyo; president: Toshiro Mitsuyoshi) has obtained ministerial approval for its original cross plywood "S Gainer". The baseboard is made of Japanese cypress and cedar combined coniferous plywood, and the surface is treated with a special sealing treatment and lined with liner paper.