Cold and expansion joints are often affected by leaks during tunnel construction. In some cases, regrouting can be recommended. Joint flanks must be first levelled and repaired with KÖSTER Repair Mortar. The joint flanks must be sound and solid and free of oil and grease. A PE backing rod is installed in the width of the joint and the joint flanks are primed with KÖSTER FS Primer 2C. After the primer has dried, KÖSTER Joint Sealant FS-V is applied with a caulking gun and is smoothed over.
In cases where the joint cannot be repaired, it is important to prevent penetrating water in order to keep the operational area dry. In such cases, KÖSTER Joint Tapes are recommended.