Truss threshold

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Half-timbered sleepers are the horizontally lying wooden beams in half-timbered structures , which, unlike transoms, run through and on which the entire half-timbered wall rests with its uprights , struts and bands . The upper end is formed by the frame , on top of which are the beam heads of the ceiling beams and the next threshold follows on the ceiling beams.

The threshold directly on the foundation wall or the foundation is called the basic threshold . The thresholds lying on the ceiling beams on the upper floors are the stick or hem thresholds . Store on the ceiling beams, the Fußschwellen . The corresponding component in the roof structure is the purlin . If the threshold or purlin rests on a solid wall, it is sometimes referred to as a wall lath .

Hem threshold

In half-timbered construction, the hem threshold is the name for a horizontal beam that runs parallel to the frame and is at a distance from it. The distance is determined by the thickness of the ceiling joists. Between the frame and the hem threshold, the bricklaying is mainly carried out with a stretcher bond.

Half-timbered threshold with typical damage

Typical damage

The basic sleepers are often the most endangered wooden beams of a half-timbered house, as in older buildings they often lie directly on an alternately damp foundation without an underlying seal . Foundation projections below the threshold can also cause the rainwater that runs off the facade to accumulate on the threshold, the thresholds can also be exposed to splashing water due to raised terrain or building methods that are too low, and thick coatings prevent drying out. The wood damage to the sleeper initially occurs in the invisible lower area, where the sleeper rests on the foundation, and then progresses inside, while the outside usually shows no visible damage for a long time. A threshold damaged in this way must be replaced in its entirety or in its damaged areas. This requires the entire building to be supported. The new threshold should be installed so that it is protected against accumulating water and allow evaporation of water on both sides.


  1. ^ Book of tables for the building and wood industry, edition B, Wilhelm Friedrich, Fachbuchverlag GmbH Leipzig, 1951