In connection with floor structures, a distinction is made between three different types of movement joints:
Movement joint Covering
Movement joint, which is only required for expansion-related changes in the length of the covering, in the case of rigid floor coverings, e.g. parquet. The movement joint is not transferred to the substrate (screed/system floor) :
1 Covering with joint formation
2 Screed/ Base course System floor, each continuous
3 Insulation layer/ System floor cavity
4 Load-bearing substrate (raw ceiling)
Movement joint Screed/ System floor
Movement joint, which is required for expansion-related changes in the length of the screed/system floor and must be adopted in the covering above. In the case of screeds on an insulating layer, the movement joint is usually not transferred to the insulating layer:
1 Covering with joint formation
2 Screed/ Precast screed/ System floor, each with joint formation
3 Insulation layer/ System floor cavity
4 Load-bearing substrate (raw ceiling)
Movement joint Shell
Building joint, which must be adopted in the same width and congruence in all layers above the raw ceiling:
1 Covering with joint formation
2 Screed/ Precast screed/ System floor, each with joint formation
3 Insulation layer with joint formation/ System floor cavity
4 Load-bearing substrate (raw ceiling) with joint formation
Schematic representations, without connection details and separation layers!
Source: bauwion
