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Cross Laminated Timber

We manufacture our CLT panels using lamina (sawn boards) made from Japanese cedar (Sugi). The panels are produced with isocyanate-based or resorcinol adhesives and meet JAS standards for F☆☆☆☆ (F four-star) classification, ensuring low formaldehyde emissions. Our product dimensions range from 36mm to 450mm in thickness, up to 1,200mm in width, and up to 8,350mm in length. These panels provide excellent strength, thermal and sound insulation, and fire resistance, making them suitable for a wide range of applications in both residential and commercial buildings, including interior finishes and structural components.
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Manufacturer
Seihoku Plywood Co., Ltd
Published date
29 Jul 2026
Product Sector
Construction product
EPD number
HUB-7074
Country
Japan
Expiry date
28 Jul 2031

EPD details

Product sector
Construction product
EPD category
Third party verified EPD (5 years)
Averaging type
No averaging
Scope
Cradle to gate with modules C1-C4 and D
Reference standard
EN 15804:2012+A2:2019/AC:2021
PCR
EPD Hub Core PCR 1.2
cPCR
EN 16485 Round and sawn timber

Manufacturer information

Name
Seihoku Plywood Co., Ltd
Address
1-25-5 Hongo, Bunkyo-ku, Tokyo, Japan
Email
quality@seihoku-group.co.jp
Website
https://www.seihoku.gr.jp

Verification details

EPD author
Ryuuichi Okada
Verifier
Afzal khan Peerukhan
Declaration status
Verified

Environmental impacts

Declared unit
1m³ of Cross Laminated Timber
Mass per unit
420.0 kg