The landing joints are not completely different from the expansion and contraction joints, except that the reasons for each are different, and the landing joints are along the building, but the expansion joints do not include the rules.

Landing spacers are set to prevent uneven leveling of the building due to the different bearing capacity of the bases or the large difference in the load for each part of the building, which leads to the destruction of the building.

That is, the main reason for this type of break is the difference in the loads on the building, which leads to a difference in the loads in the same place, so we resort to making landing breaks.

And that the other reason for this is the difference in the quality of the soil under the bases of the building, so that each soil has a specific density that differs from the other. In this case, we make the landing joints.

 And also…

When the building is built on different foundations and it is difficult to ensure uniform stability.

When the shape of the foundation, the width and depth of burial of adjacent parts of the same building differ significantly from each other, it is easy to form an uneven settlement.

When the height difference between adjacent parts of the same building is large (generally more than 10 meters), the load difference is large, or the structural shape varies greatly, etc., which may lead to uneven settlement.

When the shape of the diagram is complex and the connecting parts of the parts are weak.

Between the original building and the new or extended building.

When installing landing joints, the foundation, walls, floors and ceilings of the building should be separated in the vertical direction, so that each part can form an independent structural unit that can be freely resting.

It is worth noting that stability joints can be doubled into expansion joints. The width of the landing joints is related to the condition of the foundation and the height of the building.

The landing joints can act as expansion and contraction joints, but the partition includes the entire building without exception.

The thickness of the landing joints is determined to approximately (2-5) centimeters by following the specifications of the landing joints.

Then we fill this void by means of materials that are flexible and resistant to water and moisture factors.

 The combined width of the landing spans of buildings is not only related to the height of the building, but in fact also has to do with the inclination.

Influence factors for slope in screeds, are analyzed in terms of the theory of interaction of two adjacent foundations, such as the location of the landing spacer, the width of the foundation, the adjacent foundations, and the deflection of the load.

 The relationships between subsidence and inclination of solid foundation are found in varied subsoil under the influence of adjacent foundations and load deflection.

 The inclinations can be obtained after calculating the landing of the bases, then the width of the landing span of the buildings can be simply determined. The comparison between the simplified method and others is made by combining the two cases