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Joints in construction members are necessary to accommodate movements between them. Sealing these joints safely, means to seal them permanently elastic, form stable and UV-resistant. This allows for future movements of the construction members without causing damages.
1 Primer
KÖSTER FS Primer 2C
2 Joint sealing
KÖSTER Joint Sealant FS-H black
KÖSTER Joint Sealant FS-H grey
KÖSTER Joint Sealant FS-V black
KÖSTER Joint Sealant FS-V grey
3 Backing rod
Joints are usually exposed to thermal or other movements and must therefore be elastically sealed. The decisive factor for joint sealing is not only the durability of the joint material, but also that it adheres permanently to the flanks. The substrate must be load-bearing, clean, free of separating substances, loose components, and dry.
To prevent the tensile stresses in the joint filler from becoming too high, a sealant must be installed in such a way that it only adheres to the two joint flanks and can expand well in the transverse direction. For this purpose, a commercially available backing rod, for example, is placed in the joint before the joint filler is installed. In order to keep the tensile stresses low, the sealant is not applied in a thick layer, but in the appropriate ratio depending on the joint width.
KÖSTER MS Joint Sealant is a highly elastic, one-component, UV-resistant joint sealant with MS polymer technology. It adheres to numerous surfaces without a primer, and is solvent, silicone, water, bitumen, and isocyanate free. It is used for all types of joints in building construction such as concrete and masonry, sealing of aluminum composite panels, window frames, or natural stone facades.
For higher requirements such as solvent, root, and seawater resistance, a primer with the fast-drying, colorless, solvent free, 2-component adhesion promoter and consolidator KÖSTER FS Primer 2K is necessary.
KÖSTER Joint Sealant FS is a viscoplastic polysulphide based joint sealant that is resilient, UV-resistant, and very durable. KÖSTER Joint Sealant FS is also resistant to a variety of aggressive substances.
KÖSTER Joint Sealant is available as FS-H for horizontal joints and FS-V for vertical joints. The specifications in the Technical Data Sheets apply in each case.
1 Primer
KÖSTER KB-Pox Adhesive
2 Joint sealing
KÖSTER Joint Tape 20
KÖSTER Joint Tape 30
Movement joints must be waterproofed durably, elastically, form stable, and UV resistant. A joint waterproofing must allow for movement in the construction without causing damage to the construction itself. Movement joints up to a width of 35 mm can be waterproofed with KÖSTER Joint Sealant FS. For wider joints, such as expansion and dilation joints, KÖSTER Joint Tapes are used.
The KÖSTER Joint Tape is a thermoplastic tape for waterproofing expansion joints. It comes in widths of 20 cm (for 12 cm wide joints) and 30 cm (for up to 20 cm wide joints). The KÖSTER Joint Tape 20 and KÖSTER Joint Tape 30 are UV stable; highly elastic and can resist extreme joint movements.
The KÖSTER Joint Tape System consists of the KÖSTER Joint Tapes and KÖSTER KB-Pox Adhesive, a 2 component, epoxy based high performance adhesive.
Firstly, the KÖSTER KB-Pox Adhesive is applied onto the stable and prepared substrate. As a general rule, the substrate must be cleaned or removed down to a solid and stable base material, then leveled and primed if necessary. The substrate must be clean, solid, dry, and free from adhesion inhibiting materials, such as waxes, oils, and old coatings.
Then, the KÖSTER Joint Tape is bonded to both flanks of the joint with the first layer of adhesive, making sure that the tape has a good contact to the adhesive. Afterwards, the KÖSTER Joint Tape is embedded into a second coat of KÖSTER KB-Pox Adhesive.
Always adhere to the specifications in the respective Technical Guidelines.
1 Pump
KÖSTER Acrylic Gel Pump
2 Special rubber sealing system
3 Injection needle
4 Joint sealant
KÖSTER Injection Gel S4
5 Joint protection
KÖSTER MS Joint Sealant
The complex construction of tunnels entails great challenges for the waterproofing system. Even with the highest application standards, there could be special situations or extraordinary occurrences that could cause leaks inside the tunnels. These leaks are mostly located along the joints of the tubbing elements, and if not treated in time, could cause severe damages to the structural integrity of the tunnel.
The KÖSTER Injection Gel S4 with the B+ component is a specially designed acrylic gel for the injection of joints, providing an outstanding elasticity, a higher adhesion to the flanks, and a reduced drying tendency when in contact with moving air currents. The adjustable reaction time acrylic gel is injected inside the joint using injection needles, inserted through a special rubber sealing system placed in the joint. To avoid material loses on the back and prevent the material from running down the drainage system, a backing rod is inserted to create a defined injection area.
When the injection is completed, the special rubber sealing system can be removed and the gel protected with the highly elastic, low modulus sealant KÖSTER MS Joint Sealant.
Always adhere to the specifications in the respective Technical Guidelines.
1 Injection packer
KÖSTER Packer 13 mm x 100 mm FKN
KÖSTER Packer 13 mm x 115 mm CH
KÖSTER Packer 13 mm x 130 mm CH
2 Joint waterproofing
KÖSTER Injection Gel S4
The injection of joints represents a fairly quick method and minimally invasive way to repair failing waterproofing systems.
Hidden expansion joints, for example in an underground parking garage above a support beam, usually require a small number of injection packers. The placement of these packers is determined so that existing waterstops are preferably not perforated. This is particularly important for existing internal or external sealing bands. In the case of overhead expansion joints (dilation joints), boreholes should be ideally drilled towards the top third of the joint. In cases of floor expansion joints, boreholes should be ideally drilled towards the lower third of the joint.
KÖSTER Superpackers are inserted into the boreholes. At overhead joints, a polymer, cementitious or mechanical barrier may be necessary to seal the joint before injection, in order to avoid losses of material.
The KÖSTER Injection Gel S4 with the KÖSTER B+ component is a specially designed acrylic gel for the injection of joints, providing a higher flank adhesion, enhanced elasticity and a reduced drying tendency when in contact with air currents.
By injecting the joint with the elastic acrylic gel KÖSTER Injection Gel S4/B+, it is not necessary to excavate underground parking garages or other underground building components. Moreover, since a low number of packers is sufficient in most cases, the drilling effort is reduced and time and costs are saved.
Always adhere to the specifications in the respective Technical Guidelines.
1 Penetration
2 Backing
3 Waterproofing
KÖSTER KB-Flex 200
4 Protection layer
KÖSTER KB-Fix 5
Cable and pipe penetrations such as electrical, water and data cables must be permanently and securely waterproofed against penetrating water. Typically, rigid mortars or foams are used, which prevent the installation of other cables.
Using KÖSTER KB-Flex 200, a permanently plastic material, is a robust and easy way to waterproof against penetrating water, while allowing the installation of further cables at a later stage. The material accommodates cable movements, does not tear, and is permanently resistant against common substances found in soil and groundwater.
Before applying the material, the substrate must be clean and free of loose particles. The substrate can be dry, moist or wet.
In cases of pressurized water, a backing is installed in the penetration at a depth corresponding to the installation depth (1.5:1 / Length : Thickness) using a common PU foam. During the installation of the sealing compound, it is important to make sure that it is installed free from voids.
Finally, the sealing compound is recessed approx. 1 cm from the wall surface and smoothed with a metal spatula. As a protection layer and to hold the pipe / cable centered, the exposed material is covered with KÖSTER KB-Fix 5.
KÖSTER KB-Flex 200 has good adhesion to all commonly used building materials such as concrete, masonry, mortar, plaster, brick, and all other mineral construction materials, as well as ceramic, PVC, polyethylene and polypropylene. A primer is not necessary.
Always adhere to the specifications in the respective Technical Guidelines.
