Injection of expansion joints

For the injection of expansion joints (pictured here in an underground parking garage ceiling above a support beam) usually a small number of injection packers are sufficient. The placement of these packers is calculated so that existing waterstops are not penetrated. This is particularly important for existing internal or external joint tapes, as well as for floor / floor joint tapes.

In the case of overhead expansion joints (dilation joints), boreholes should be ideally drilled into the top third of the joint. In cases of floor / floor expansion joints, boreholes should be ideally drilled into the lower third of the joint.

KÖSTER Superpackers are inserted into the boreholes. At overhead joints a cementitious barrier such as KÖSTER Injection Barrier may be necessary to seal the joint before injection. For example, by the installation of a fillet, as seen in the graphic above where the support beam and ceiling meet. Additionally, in certain cases a pre-injection with the very fast reacting KÖSTER Injection Gel S4 can be advisable. Only enough material to seal any potential outflow areas should be used.

The KÖSTER Injection Gel S4 with the B+ component is a specially designed gel for the injection of joints with very high adhesion to the flanks and a reduced drying tendency when in contact with moving air such as wind.

The injection of joints represents a fairly quick method and minimally invasive way to repair waterproofing. By injecting the joint, it is not necessary to excavate underground parking garages or other underground building components. Moreover, since a low number of packers are sufficient in most cases, the drilling effort is reduced and time is saved.

Always adhere to the specifications in the respective Technical Guidelines.



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