Joints in construction members are necessary to accommodate movements in these construction members. Sealing joints in construction members safely means to seal them permanently elastic, form stable and UV-resistant. This allows for future movements of the construction member without causing damages.
Construction joints are exposed to movements caused by thermal or other stresses. To waterproof construction joints permanently an elastic material is required. KOSTER Joint Sealant FS is a proven joint sealant; it is resistant to mechanical stresses, UV radiation and aging. KOSTER Joint Sealant FS is also resistant to aggressive chemicals.
Important for permanently waterproofing construction joints is not only to apply a durable material, it also needs to permanently adhere to the joint flanks. The substrate must be stable, clean and dry as well as free of bond inhibiting substances. The substrate is primed with KOSTER FS Primer.
The optimal absorption of the tension is guaranteed when the KOSTER Joint Sealant FS is installed only connected to two opposing joint flanks. It allows the material to expand across the construction joint. To separate the joint sealing from the bottom a customary PE-round cord is installed into the joint before applying the material. To avoid damage caused by tension stresses the joint sealant is applied in thicknesses depending on the measurements of the joint. The proportion of the applied sealant should be 1 : 1 to 1 : 2 (height to width of the joint).
For application in agricultural concrete construction KOSTER PU-Joint Sealant is used.
Always adhere to the specifications in the respective Technical Guidelines.
Joint sealing by pressure injection into dry, damp and water bearing joints
Waterproofing joints which are exposed to water, active leakage or even pressurized water is a challenge because common joint sealing materials don’t bond to wet substrates.
KOSTER KB-Pur Gel is applied by pressure injection into the joint, old joint sealants generally don’t have to be removed. KOSTER KB-Pur Gel reacts with water and creates an elastic waterproofing material. Even flowing water can be stopped with this method.
Always adhere to the specifications in the respective Technical Guidelines.
Because the subsequent sealing and waterproofing of construction joints requires experience and should be analyzed case by case, please contact our technical consultants. They will be glad to answer your questions.
Joint sealing on dilatation joints and other moving joints
Construction joints wider than 35 mm are waterproofed with KOSTER Joint Tape 20 (20 cm width) or with KOSTER Joint Tape 30 (30 cm width).
KOSTER KB-Pox Adhesive is applied onto the stable and prepared substrate. KOSTER Joint Tape is bonded to both flanks of the joint with the first layer of adhesive. After that the joint tape is embedded into a second coat of KOSTER KB-Pox Adhesive. KOSTER KB-Pox Adhesive has excellent adhesion to concrete and to the KOSTER joint tape. KOSTER joint tapes are elastic and tear-resistant.
Always adhere to the specifications in the respective Technical Guidelines.
