Grout curtains

The term "grout curtain" is used in connection with the remedial waterproofing of construction elements in contact with the ground that are subject to water infiltration. These may be basements, sewers, shafts or tunnel structures. This waterproofing method, sometimes termed "grout cut-off", is mainly adopted in situations where renewed excavation is not financially viable.

Due to seasonal climatic fluctuations, the water infiltrating into the masonry or concrete may cause further damage, such as spalling or larger-scale cracking.

Through the injections, a "curtain" of water-impermeable material is inserted in the ground adjacent to the construction element. By virtue of the grout's swelling action upon contact with water, the curtain will continue to protect against further water ingress in the future. At the same time, the material will contract as soon as the subsoil dries out. It is essential for this process to remain reversible.

Acrylate-based injection products represent the most suitable type of material for grout curtains.