KonstruktionholzGrade

KonstruktionholzGrade is a term used in the German-speaking construction industry to describe the classification of timber intended for structural use. It refers to the strength class and qualitative assessment of a piece of wood, indicating its suitability for load-bearing elements such as beams, columns, and rafters. The grade helps engineers and builders select timber with predictable mechanical properties for safe and economical design.

In practice, structural softwood is often marketed as Konstruktionsvollholz (KVH) or simply by strength classes such as C14, C24, C30, or C40. The number in the grade denotes the approximate bending strength and stiffness the wood can reliably provide, according to standardized testing. Alongside the strength class, timber is evaluated for defects, knot content, straightness, and moisture content. The moisture class affects performance, with construction timber commonly available in seasonal moisture conditions that suit the intended environment.

Standards and labeling play a key role. European standards such as EN 338 define the system of strength classes for softwood, while EN 14081-1 specifies grading and marking requirements for construction timber. These standards ensure that the grade information on a timber piece is consistent and traceable, enabling designers to apply appropriate design values in conjunction with codes like the Eurocode.

Applications and selection emphasize the relationship between grade and load-bearing capacity. Designers use the stated strength class and manufacturer data to select timber for headers, beams, studs, or roof structures, considering factors such as exposure class and potential durability treatments. Proper verification of the grade, moisture content, and certification is essential for structural safety.