Cracks in the building substance are structurally weak points. Additionally, penetrating water may cause damage and may reduce the usage and lifetime of the building. An elastic sealing or structural-bonding 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.
Crack injection by pressure injection on dry or wet cracks
Dry or wet cracks are sealed permanently with KOSTER injection materials .
KOSTER 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 stops it by reacting with the water or displacing it. A second injection using the same material permanently and elastically waterproofs the crack.
KOSTER KB-Pur IN 3 is used for the structural bonding of cracked or damaged building elements. KOSTER 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.
KOSTER 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 KOSTER injection resins are installed with the KOSTER 1C Injection Pump via injection valves called “Packers” into the crack. Depending on the application, different packers are available. KOSTER Impact Packers “12” are installed very quickly and are recommended for low to medium pressure.
KOSTER Packers and KOSTER Superpackers are used for all applications from low to high pressure.
KOSTER 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.
In case of water actively leaking from a crack a combination of KOSTER KB-Pur IN 1 (very fast foaming after contact with water) and KOSTER KB-Pur IN 2 (used for permanently sealing the crack) is applied.
KOSTER KB-Pur IN 7 is also a very fast foaming injection resin which creates a permanently elastic seal. KOSTER KB-Pur IN 7 needs to have contact with water to build foam and for curing.
All KOSTER injection resins are installed with the KOSTER 1C Injection Pump via injection valves called “Packers” into the crack. Depending on the application, different packers are available.
KOSTER Impact Packers “12” are installed very quickly and are recommended for low to medium pressure.
KOSTER Packers and KOSTER Superpackers are used for all applications from low to high pressure.
KOSTER 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.
A special solution for waterproofing cracks in floor slabs is injection via the KOSTER Pressure Port. The plunger of the KOSTER Pressure Port is pressed down over the crack. For the injection of large areas the major advantage of this method is that no boreholes and packers have to be installed for injection. Before the application of the resin the crack is pre-wetted and filled with KOSTER KD 2 Blitzpowder, (holes are left open at regular intervals). The injection occurs via the KOSTER Pressure Port.
KOSTER KB-Pur 2 IN 1 is the standard material for waterproofing cracks. The material forms foam when it comes in contact with water and stops it by reacting with the water or displacing it. A second injection using the same material permanently and elastically waterproofs the crack.
KOSTER KB-Pur IN 3 is used for the structural bonding of cracked or damaged building elements.
The material is injected with the KOSTER Injection Pump through the KOSTER Pressure Port.
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 KOSTER Superpackers or KOSTER One Day Site Packers are used. The injection is done with the KOSTER 1C Injection Pump.
For this KOSTER 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 KOSTER KB-Pur 2 IN 1 is injected. It is injected twice 10 – 20 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
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 KOSTER 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 Guidelines.
