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HomeMy WebLinkAboutShou Sugi Ban Siding Phone +1-503-512-6780, Fax +1-503-828-3665 info@nakamotoforestry.com Mailing: 4110 SE Hawthorne Boulevard #190, Portland Oregon 97214-5246 USA Suyaki – “Pure Char” Original charred surface without brushing Exterior—delicate surface with maximum longevity Interior—high-traffic surface with even black color Species Cryptomeria japonica, a native Japanese Cypress species known for rot resistance and dimensional stability. Cryptomeria is the “sugi” in yakisugi and “shou-sugi-ban”, also called Japanese Cypress or Japanese Cedar in the West. Fire Resistance Exterior and interior fire retardant treatment available for code compliance but product tests to CLASS A Flame Spread and Smoke Developed with or without fire retardant. CAN/ULC S102-10 tests to FS of 25 and SDI of 60 without flame retardant. Hardness 320 – 510 Heartwood Unlimited combination of heartwood and sapwood, pith allowed. Grain Outside of log faces outside of plank profile to ensure weather resistance, always with flat grain center and angled grain to edges. Planks are graded for consistent grain density and pattern, with irregular grain patterns or boards deselected. Dimensional Stability Culling of warped, crowned, crooked, or cupped boards is carried out during resaw, air drying, sun drying, moulding, charring, packing, and finishing operations. Since growth rings are always aligned towards the outside of the plank profile, minor cupping (concave approximately 1/16”) is common and acceptable. Cupping is not noticeable after installation, and samples will cup more than shipped product. Phone +1-503-512-6780, Fax +1-503-828-3665 info@nakamotoforestry.com Mailing: 4110 SE Hawthorne Boulevard #190, Portland Oregon 97214-5246 USA Color Black with silver to rainbow iridescence on the unfinished, or oiled, burned surface depending on light and angle. Polyurethane-bonded surface for interior applications will lose the iridescence and be an even black color. Knots Unlimited sound, tight knots permitted. Texture Small to large crevasse pattern variable according to grain pattern, production environment, board density, moisture content, etc., and range from ¼”~1.5” wide squares. Soot layer is approximately 1/16” thick. The charred surface has an easily damaged shell unless prefinished. Checks Checks allowed to 1/16” as long as plank stability, weather-resistance, and cosmetics are not adversely affected. Moisture Content Air and sun dried, then flash kiln dried to 11~14% MC. MC may fluctuate according to conditions during transport or warehousing. Finish There are two oil prefinish formulation options: • For exteriors a penetrating oil finish with flexible hardening oil component will bond loose soot into the surface enough to ship and install. After drying minimal soot will wipe off when touched, though surface remains soft. This prefinished surface has maximum wood longevity but is not recommended for high-traffic areas. • For interiors a high-traffic surface-hardening polymer finish will bond loose soot into the surface and stabilize the soot layer for a more robust, washable finish. Color is a consistent satin black. • Unfinished charred Suyaki is soft and sooty when touched, and damages easily. Due to surface abrasion during trucking to site, and unfinished Suyaki simply being such a foreign product in the West, we do not ship without prefinish. Phone +1-503-512-6780, Fax +1-503-828-3665 info@nakamotoforestry.com Mailing: 4110 SE Hawthorne Boulevard #190, Portland Oregon 97214-5246 USA Dimensions