Crack injection and hose injection

Cracks in the building substance are structural weak points. They shorten the life expectancy of the whole structure because the building substance is weakened considerably by the penetrating water. An elastic or structural-strength-bridging closure of the crack is required. In order to achieve this, the crack is filled over its entire course with a polyurethane injection resin via pressure injection. The injection resins which are applied can also be used in drinking water environments.

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Crack injection by pressure injection on dry or wet cracks

Dry or wet cracks are sealed permanently with KÖSTER injection materials .

KÖSTER KB-Pur 2 IN 1 is the standard material for waterproofing cracks. The material forms a foam when it comes in contact with water and therewith stops or displaces it. A second injection using the same material permanently and elastically waterproofs the crack.

KÖSTER KB-Pur IN 3 is used for the structural bonding of cracked or damaged building elements.

KÖSTER KB-Pur IN 5 is a very low viscous polyurethane injection resin with a very long pot life. It is especially suitable for injection into very small and fine cracks.

KÖSTER Micro Grout 1C is a mineral injection material which is ideal to fill voids and cracks of medium width. The material has excellent adhesion properties even to damp substrates. It also possesses a very high compressive strength after curing.

All KÖSTER injection resins are installed with the KÖSTER 1C Injection Pump via injection valves called “Packers” into the crack. Depending on the application, different packers are available.

KÖSTER Impact Packers “12” are installed very quickly and are recommended for low to medium pressure.

KÖSTER Packers and KÖSTER Super Packers are used for all applications from low to high pressure.

KÖSTER One Day Site Packers have an extra valve so that the upper part of the packer can be removed directly after injection and the hole plugged. The borehole stays pressure sealed.

Always adhere to the specifications in the respective Technical Guidelines.

Injection on water bearing cracks

In case of water actively leaking from a crack a combination of KÖSTER KB-Pur IN 1 (very fast foaming when contact with water) and KÖSTER KB-Pur IN 2 (used for permanently sealing of cracks) is applied.

KÖSTER KB-Pur IN 7 is also a very fast foaming injection resin which creates a permanently elastic seal. KÖSTER KB-Pur IN 7 needs to have contact with water to build foam and for curing. 

All KÖSTER injection resins are installed with the KÖSTER 1C Injection Pump via injection valves called “Packers” into the crack. Depending on the application, different packers are available.

KÖSTER Impact Packers “12” are installed very quickly and are recommended for low to medium pressure.

KÖSTER Packers and KÖSTER Super Packers are used for all applications from low to high pressure.

KÖSTER One Day Site Packers have an extra valve so that the upper part of the packer can be removed directly after injection and the hole plugged. The borehole stays pressure sealed.

Always adhere to the specifications in the respective Technical Guidelines.

 

Waterproofing of construction joints in the wall/floor junction

For retroactive waterproofing of the wall-floor junction the boreholes have to be drilled transecting the construction joint. The borehole should be drilled approximately into the middle of the construction joint.

For this application KÖSTER Superpackers or KÖSTER One Day Site Packers are used. The injection is done with the KÖSTER 1C Injection Pump.

For this KÖSTER KB-Pur IN 5 can be used, which is a very low viscous polyurethane injection resin with a very long pot life. It will pass into the small and finest cracks along the construction joint.

In case of flowing water or when it is not certain if the crack is dry or wet KÖSTER KB-Pur 2 IN 1 is injected. It is injected twice 20-30 minutes apart to ensure that the joint is permanently and elastically sealed.

Always adhere to the specifications in the respective Technical Guidelines.

Construction joint injection via an injection hose

1 Injection hose

2 Injection Resin
KÖSTER IN 5

Construction joints, especially in the wall floor junction, when installed underneath ground level always need particular attention when it comes to waterproofing. Defects in this area are not uncommon. Before pouring the concrete for the rising wall, the injection hose is installed in the construction joint. Injection hoses are perforated or slotted. After the concrete has cured an elastically curing resin is pressure injected into the injection hose. The joint is now permanently elastically sealed and waterproofed. 

For the application via injection hose KÖSTER KB-Pur IN 5 is the product of choice. It has a low viscosity and a long pot life. These two aspects are very important for the application so the product has enough time to enter the small and fine voids and doesn’t start to react during the injection.

Always adhere to the specifications in the respective Technical

External basement waterproofing with curtain injection

Exterior basement waterproofing from inside the building? In the case of renovation it is not always possible to expose the exterior walls through excavation. For example, where the area to be excavated is built upon, traffic concerns impede the excavation, or the economic cost of excavation is deemed too high. In this case you would first think of an internal (negative side) basement waterproofing, but in some cases, such as in historical buildings or buildings with special architectural requirements, this may not be desirable.

In these cases a curtain injection with KÖSTER Injection Gel G4 is possible: The resin is injected through the wall from the inside to the outside. The resin reacts with water and binds it resulting in a waterproof, elastic solid. The injection is carried out with a special two-component pump, KÖSTER Acrylic Gel Pump, and through patented KÖSTER Distributor Lances. The injection material is dispersed on the exterior wall and in a short time reacts to a waterproofing layer.

An alternative method is injecting KÖSTER Injection Gel G4 into the building member itself. This so-called “area injection” is possible in porous or hollow building materials. In this case the KÖSTER Injection Gel G4 also reacts with any water present to form a waterproof, elastic solid.

Always adhere to the specifications in the respective Technical Guidelines.

Vertical and horizontal curtain injection

The subsequent waterproofing of building components which are not accessible due to neighboring construction or other considerations (such as tunnels, underground parking garages, elevator shafts, or concrete base slabs), is commonly carried out through the waterproofing method referred to as curtain injection. The graphic above shows an elevator shaft being subsequently waterproofed through horizontal curtain injection (underneath the concrete base slab) and through vertical curtain injection (through the walls).

A quadratic, surface-centered grid of standard impact packers have been drilled into the building component. KÖSTER Injection Gel G4 is injected in numerous phases through the drill holes and results in hemispherical areas of waterproofing on the positive (outer) side of the wall, separating the building component from ground water. For this particular field of application KÖSTER Injection Gel G4 has received a general construction approval from the Deutschen Institut für Bautechnik (German Institute for Structural Engineering).

Curtain injection of building components with perforated bricks, bricks with finger holes, aerated concrete blocks, or double-wall constructions require the use of special impact packers. These injection lances, also known as very long packers, can bridge cavities within the wall and discharge the injection material into the ground on the outer side of the building component.

Always adhere to the specifications in the respective Technical Guidelines.

Masonry injection

Vertical masonry injection (also known as area injection) is a standard method for the subsequent waterproofing of brick building elements in which excavation is not economical or possible. Boreholes are drilled horizontally on the inside of the building component and angularly at wall-floor connections and wall corners. The drilling depths are determined according to the wall thickness and can amount to 50% to 90% of the wall thickness. The drill holes must be drilled in such a way that at least one joint is crossed. The holes are drilled in a grid horizontally and vertically with every second row offset. Packers are spaced according to the masonry type at hand. The diameter of the drill holes depends on the chosen packers.

KÖSTER Superpackers are inserted into the drill holes. In most cases, it is necessary to install an injection barrier, for example with KÖSTER Injection Barrier, in order to prevent the loss of injection material due to uncontrolled outflow. In cases of exposed masonry where the appearance must be maintained (such as in historical vaults), KÖSTER Repair Mortar NC can be used for touch ups where needed without significantly altering the appearance of the masonry instead of installing a complete injection barrier.

KÖSTER Injection Gel G4 is injected in multiple phases until a pressure resistance is achieved. Afterwards the packer holes are filled with KÖSTER KB-Fix 5. For a decorative and functional surface design, KÖSTER Restoration Plasters can be applied over the KÖSTER Injection Barrier.

Always adhere to the specifications in the respective Technical Guidelines.

 

 

 

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