The manufacture and use of Duobalken® and Triobalken® are subject to compliance with the following technical standards
EN 14080:2013-08 Structural timber ‒ glue-laminated timber and laminated beams ‒ requirements acc. to:
EN 1912:2013-10Structural timber for load-bearing applications ‒ strength grading ‒ allocation of visual grades and timber types
DIN 4074-1:2012-06Grading of softwood timber by load capacity; part 1: Softwood sawn timber
Agreement between the Federation of German Carpenters (Bund Deutscher Zimmermeister) and Überwachungsgemeinschaft Konstruktionsvollholz e.V. on Duobalken® and Triobalken® (September 2015 version).