Fields of Application

Dams and canals

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The watertightness in concrete structures is provided by the concrete itself but due to the concrete’s characteristics, the likelihood of developing cracks and other leaking pathologies requires the waterproofing treatment of the upstream side. On the other hand, the masonry structures are even more critical in developing leakages and requiring an effective waterproofing system.

The KOSTER TPO Aqua 2.5 Geo is an extremely robust TPO membrane made with the highest quality polymers and special additives that provide a very flexible but at the same time, very strong membrane. Our membrane features a 2,5 mm homogenous PE base TPO with a bottom section with factory embedded 500 g polyester fleece geotextile, for extra protection of the membrane against irregularities and protuberances that with the water pressure and weight, could contribute to damage the integrity of the membrane.

This special membrane allows the fastest waterproofing application method available, both for new structures and old structures that require a renovation. It is simply applied with mechanical fixation to the structure, without the necessity of any kind of surface preparation or removal of any old coatings that might exist, and allows a high stability in steep slopes and durability against atmospheric agents.

The use of our KOSTER TPO Aqua 2.5 Geo, reduces almost to zero the negative effect of cracks, substrate erosion and growing weeds on the concrete or masonry surface.

This special membrane is a truly environmentally responsible product, totally free of plasticizers and other volatile compounds and will help saving millions of cubic meters of water, with total security and respect for the environment.

Car Parking and Bridge Deck Waterproofing System.Fields of Application

Car Parking and Bridge Deck Waterproofing System

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The KÖSTER Car Parking and Bridge Deck Waterproofing system consists of the two-component epoxy resin KÖSTER CT 225 Bridge Deck Coating and the elastic KÖSTER ECB 2F Waterproofing Membranes.

KÖSTER CT 225 Bridge Deck Coating is a thermally stable priming epoxy and is used to prepare the surfaces of concrete road sections, bridge decks, car parking decks and civil engineering structures for overworking with mastic asphalt according to ZTV-ING (part 7).

The waterproofing system that is applied directly onto this primer is based on KÖSTER ECB membranes made of a mixture of Ethylene Copolymer and a special bitumen. The KÖSTER ECB 2F is a membrane especially designed for the secure waterproofing of roads, Car Parking and bridge decks, according to the high german standards ZTV-ING (part 7). The KÖSTER ECB 2F membranes contain a centrally embedded glass fiber mesh and are additionally laminated with a polyester fleece on both sides in order to provide adhesion to the substrate below and to the upper structure. The application of KÖSTER ECB 2F membranes is carried out with hot bitumen.

For the compensation of movements between different concrete sections, it is necessary to install a two-layer membrane system above the joints, while a backing rod is placed in the chamfered joint section between the membranes.

Always adhere to the specifications in the respective Technical Guidelines.

Fields of Application.Waterproofing of pipes, manholes and sewage areas

Waterproofing of pipes, manholes and sewage areas

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Waterproofing tanks and pipes in sewage systems represent always a challenge due to the multiple substrate conditions, different construction materials, as well as demands on each of elements. Active leakages can be stopped within a few seconds simply by using the dry powder KÖSTER KD 2 Blitz Powder or alternatively the plugging mortar KÖSTER Waterstop.

For the substrate preparation, all contaminants and separating substances have to be removed from the surface. After that, the surface has to be levelled and reprofiled with KÖSTER Repair Mortar NC or KÖSTER Repair Mortar R4.

Large areas are waterproofed with the mineral based, sulfate resistant waterproofing system KÖSTER NB 1.

Floor and wall areas that are subject to acid attack caused by condensation of the gases, can be protected with the three-component, highly chemical resistant, silicate and polymer-based special mineral mortar KÖSTER PSM. The sealant KÖSTER PSM 2S + serves as protection against thermal and chemical stresses.

The quick restoration of the concrete elements is accomplished with the water tight, fast curing and fast setting restoration mortar KÖSTER Sewer and Shaft Mortar; allowing a fast reopening of the sewage system. KÖSTER Sewer and Shaft Mortar develops a high compressive strength, is fiber reinforced, very easy to apply and workable even under flowing water. It is also approved for drinking water applications.

Voids and even gaps between the elements can be securely sealed within its smallest pores with the extremely low viscosity acrylic gel KÖSTER Injection Gel G4. Crack injections can be carried out with the KÖSTER 2 IN 1.

Always adhere to the specifications in the respective Technical Guidelines.

Fields of Application.Waterproofing of swimming pools

Waterproofing swimming pools

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Waterproofing swimming pools presents a set of distinctive and rigorous requirements that demand specialized attention. This endeavor is not only about creating a suitable base for liners, elastomeric paints, or tiles but must also withstand both positive and negative side water pressure while demonstrating exceptional crack-bridging capabilities due to the inherent settling of pool structures.

The process begins by ensuring the substrate is sound, solid, and free of any substances that could hinder proper bonding. As a crucial primer, we employ KÖSTER Polysil TG 500, which not only strengthens the substrate but also minimizes the mobility of salts. To fortify the integrity of the system and prevent potential stresses in subsequent waterproofing layers, the installation of fillets at the wall-floor and wall-wall junctions is imperative. This task is executed with precision using KÖSTER WP Mortar.

For the initial layer on the prepared substrate, a minimum of one application of KÖSTER NB 1 is essential to create a reliable base for the system. In situations involving negative side water pressure and in-ground pools, the application must consist of a minimum of two layers.

The positive side waterproofing is carried out with crack bridging systems like KÖSTER NB Elastic Grey or KÖSTER NB 4000. These materials are celebrated for their outstanding durability, ability to withstand pressurized water, tolerance for occasional foot traffic, and even their compatibility with tile coverings. Their unique attributes shine through in their capacity to form a resilient bond with damp substrates, delivering enduring protection owing to their impressive elasticity.

Fillets at wall-floor junctions, intricate details, and overall (full area) reinforcement are meticulously realized by embedding KÖSTER Glass Fiber Mesh into the initial fresh layer of the waterproofing material. Application of the second layer should commence once the first layer is no longer susceptible to damage during the application. The system is completed with the tile installation, accomplished with the versatile adhesive KÖSTER BD Flexible Tile Adhesive.

Pipe penetrations are addressed with precision, utilizing KÖSTER KB-Flex 200, and sealed securely with KÖSTER KB-Fix 5.

Successful waterproofing of swimming pools hinges on proper concrete structure design, encompassing considerations such as structural integrity, concrete thickness, quality, and the placement of necessary expansion/dilatation joints to accommodate stresses, among other factors.

Consistent adherence to the specifications outlined in the relevant Technical Guidelines is paramount to achieving optimum results and ensuring the longevity of the waterproofing solution.

Fields of Application.Waterproofing of water and potable water tanks

Waterproofing water tanks with 2 component elastic mineral coat

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Often water tanks have special requirements on the waterproofing system, such as being elastic with crack-bridging capabilities. Other factors may be pollutants in the water, as is common with skimmer tanks. A system including KÖSTER 21 is exactly the right choice for these types of environments.

Fields of Application.Waterproofing of water and potable water tanks

Waterproofing water tanks with 1 component crystalizing mineral coat

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Waterproofing tanks with mineral based products has a long history of successful applications. Various design requirements such as water-tightness, durability, mechanical and chemical resistance must be considered, as well as certification for use in drinking water environments. The KÖSTER NB 1 system for these types of constructions meet and exceed all of these requirements.

Fields of Application.Waterproofing of water and potable water tanks

Waterproofing water tanks with TPO membranes

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Waterproofing for drinking water storage structures and tanks must not only remain watertight for many years, but must also meet all sanitary requirements. KÖSTER TPO Aqua is a homogeneous thermoplastic polyolefin waterproofing membrane for drinking water structures. KÖSTER TPO Aqua complies with the hygienic requirements for potable water surroundings according to the German DVGW Worksheet W 270 and the KTW guideline.

The membrane is mechanically fastened, which leads to low preparation requirements on the substrate. The substrate must be as smooth as possible and free of edges, depressions, and other defects that can mechanically damage the membrane. Edges must be ground and depressions and holes filled and leveled with KÖSTER Repair Mortar. Soil substrates must be excavated down to a solid layer and mechanically compacted. In interior corners on concrete, masonry, or other mineral substrates and structures, install a fillet made of KÖSTER Repair Mortar Plus on the wall-floor-junction approx. 24 hours prior to the
application. For extra mechanical protection of the membrane, a geotextile mat (approx. 500 g/m²) can be installed on the bottom of the reservoir before installing the KÖSTER TPO Aqua.

Overlaps are connected by hot air welding, which creates a homogeneous, durable connection.
For large areas, the Leister Automatic Welder Varimat V2 hot air machine is used. Details and non-accessible areas are welded with the Leister Hot-Air Hand Tool with a 40 mm nozzle.

Details such as terminations, penetrations, and flashings are job-site specific and require special care. Always adhere to the specifications in the respective Technical Guidelines.

Fields of Application.Waterproofing balconies and terraces

Waterproofing of balconies and terraces with mineral based waterproofing systems

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Mineral waterproofing for balconies and terraces demands the utilization of crack-bridging systems such as KÖSTER NB Elastic Grey or KÖSTER NB 4000. These waterproofing materials are renowned for their exceptional robustness, resistance to pressurized water, tolerance for occasional foot traffic, and even the capability to accommodate tile coverings. Their standout features lie in their ability to form a strong bond with damp substrates, and long-lasting protection thanks to their remarkable elasticity.

As is customary with any waterproofing project, the concrete surface demands meticulous preparation, requiring mechanical cleaning until a solid, well-prepared substrate is achieved. The reinforcement steel must undergo a thorough rust removal process via sandblasting, reaching a minimum grade of Sa 2 ½. In cases of substantial damage, reinforcing the steel is imperative.

Prior to the installation of the waterproofing system, concrete repair work, and fillet installation can be effectively executed using KÖSTER Betomor Multi A. When surface leveling or slope creation is required, KÖSTER Repair Mortar stands as the highly recommended solution. Substrates, in general, are hardened and primed with KÖSTER Polysil TG 500.

Fillets at wall-floor junctions, intricate details, and overall (full area) reinforcement are meticulously realized by embedding KÖSTER Glass Fiber Mesh into the initial fresh layer of the waterproofing material. Application of the second layer should commence once the first layer is no longer susceptible to damage during the application. The system is completed with the tile installation, accomplished with the versatile adhesive KÖSTER BD Flexible Tile Adhesive.

It is of utmost importance to consistently adhere to the specifications outlined in the relevant Technical Guidelines for optimum results and longevity.

Fields of Application.Internal basement waterproofing

Concrete tunnel waterproofing and restoration

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The method for waterproofing tunnels and reinstate its proper surface condition with KÖSTER products is based on a combination of negative side waterproofing and surface restoration systems.

Flowing water is stopped by injecting the water reactive elastic PU-injection resin KÖSTER 2 IN 1. Small leakages which are being penetrated by water as well as water droplet formations can be sealed with KÖSTER KD 2 Blitz Powder. To waterproof the entire surface from the negative side KÖSTER NB 1 Grey is applied to the prepared substrate. This is followed by a layer of the polymer modified levelling mortar KÖSTER C-Coat to create a uniform appearance. Finally, the system can be covered with a finishing touch of KÖSTER Acrylic Paint.

Always adhere to the specifications in the respective Technical Guidelines. Also observe the local guidelines and standards.

Fields of Application.Internal basement waterproofing

Internal masonry tunnel Waterproofing

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Several waterproofing systems can be applied to the negative pressure inner side. KÖSTER KD 2 Blitz Powder and KÖSTER Waterstop can be used to stop small leaks. Joints can be repaired with KÖSTER Repair Mortar or KÖSTER WP Mortar, and KÖSTER NB 1 Grey is to be applied on surfaces as negative side waterproofing.