Traglatten

Traglatten is a term used primarily in German-speaking regions to describe elongated wooden elements that function as primary load-bearing slats in timber construction. The name derives from trag, meaning to bear, and latten, meaning slats. Traglatten are laid across supporting timbers to distribute loads from floors, roofs, and upper walls to the structural frame, and they often provide a stable base for finishing layers such as boards or plaster.

Materials and manufacture: They are typically milled from softwoods like spruce or pine. Dimensions vary by application, but Traglatten are generally several centimeters thick and about 8–12 centimeters wide, with actual lengths matching the span. They may be seasoned or treated for outdoor durability. Installation uses nails or screws with weather-resistant connectors when used externally, and alignment and spacing follow local codes and structural calculations.

Applications and function: In historic timber-frame construction, Traglatten serve to distribute load and reduce local stress on the frame, while also providing a solid base for plaster, boarding, or floor coverings. In some contexts they act as a primary bearing member; in others, as a substrate for secondary layers. They are often discussed in conservation literature when restoring older buildings.

History and terminology: The term appears in older German construction literature and in conservation reports, and is closely related to Traglattung or load-bearing battens in related traditions. In modern practice the specific term is less common, with standardized lumber and engineered products playing larger roles.

Related terms include Traglattung and Lath, Joist, Batten.