Quality certificates

We hold the most demanding quality certificates on the market for our products and our engineering and installation processes.

  • Production control certificates
    AITIM 15-01 quality seal for laminated wood manufacturing.
    AITIM 22-02 quality seal for structure engineering and installation.
    OTTO-GRAF: Highest recognition by the OTTO-GRAFF institute regarding the competence to manufacture glued load bearing timber structures for the construction industry, in accordance with Standard DIN 1052. “Certificate A” Approval.
    CE marking.

    sellos de control de producción
    marcado CE

  • Management quality certificates
    UNE-EN ISO 9001:2008 for the design, production and installation of laminated timber structures.

    sellos 9001

  • Environmental management certificates
    UNE-EN ISO 14001:2013 for the design, production and installation of laminated timber structures.

    sellos 14001

  • Health and safety certificates
    UNE-EN ISO 18001:2013 for the design, production and installation of laminated timber structures.

    sellos 18001

  • Chain of custody certificates
    PEFC/14-38-00001-02 promoting sustainable forest management.

    sellos gestión forestal

Grupo Holtza, S.L - Poligono Industrial Gojain - C/ Padurea 2b 01170 - LEGUTIANO (Alava - España)
Tel.: (+34) 945 465 508 - Fax: (+34) 945 465 570 - holtza@holtza.es
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