Crack Injection / Flex Tape

Cracks form unwanted parting planes in the concrete structure and affect the tightness of the concrete component. From a crack width of > 0.2 millimetres, a crack in concrete components can be water-bearing. This can lead to corrosion of the steel reinforcement in the concrete or to water penetration into the interior of a building. In particular, the area of the wall-sole connection must not have any leaks, as otherwise water can enter the building unnoticed and this process is only noticed after some time, as the water initially collects unnoticed under the screed. In addition to the functional impairment, the moisture under the screed insulation layer provides the ideal conditions for microbial growth such as mould and bacteria.

A proven method of sealing cracks in concrete building components is ISOTEC crack injection. A special synthetic resin is pumped into the crack using a high-pressure process. It is characterised by its flexibility, impermeability to water and resistance to all types of moisture.

At ISOTEC we only use sealing material that has been verified to comply with the structural requirements. This applies to the material as well as to the machinery used for the processing of the sealing material.

Our ISOTEC flex tape is made of a special plastic that is extremely elastic. With an elongation capacity of up to 400 percent, our ISOTEC flex tape therefore offers sufficient security to seal even dynamic cracks and component joints with larger movements permanently watertight.

Our ISOTEC flex tape system is not only used as a subsequent sealant for water-bearing cracks and construction joints in concrete components. It is also used in the frequently damage-prone area of expansion joints between two concrete components, which are often found in underground garages and large basement facilities.

Attention must be paid to this during crack injection/flexible tape system:

• Sufficient pre-treatment of the concrete substrate in the area of the adhesive bed to ensure adhesion of the flex tape system to concrete.
• The top layer of concrete must be removed by grinding and the grinding dust must have been removed.
• The substrate must not be wet.

Our ISOTEC specialist companies and the employees are trained in the Flexband system and are skilled in practical processing. With regular further training, they are technically up to date in order to always offer customers the best technical solution.

The ISOTEC flex tape system has been used successfully for decades for watertight sealing on the side of concrete structures facing away from water. Since then, ISOTEC specialist companies have already applied several kilometres of sealing tape to countless concrete structures. All structures have been successfully sealed using the ISOTEC flex tape system. This also applies to buildings that are immersed up to twelve metres into the groundwater.