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A CGI Northeast worker injects the liquid components of the gel into leaks from the interior side.
A CGI Northeast worker injects the liquid components of the gel into leaks from the interior side.
August 18, 2015 1:00 PM CDT

Concrete Gel Injection for eliminating moisture damage

Product to watch


Concrete Gel Injection (CGI) is a specially developed system from CGI Northeast Inc. that prevents and repairs underground water leakage and damage by working from the interior side of a building wall, eliminating the need for any external excavation.

CGI drills holes from the interior and injects a two-component hydrophilic resin that reacts chemically to form a flexible water-sealing gel through the process of polymerization. When the CGI chemical reaction takes place, the gel doesn’t expand like urethane foam; it simply occupies the volume of the crack or cold joint full depth to the exterior.

The gel, unlike grout, will not break down in the presence of water. It can mix and coexist with water containing oil, salt and/or sewage. And, since, it doesn’t drill all the way to the exterior, it won’t compromise any previously installed waterproofing membrane. The CGI system can be used for any below-ground concrete, brick or stone structure, including basements and sub-basements; underground parking garages; structural vaults; and elevator pits.

The CGI system is highly elastic and flexible to vibrations. It is less costly than methods requiring major overhauls, and is easy to clean with water as no cleaning solvents are required. It produces little to no odor; will not promote the growth of fungi, mold, or bacteria; and is environmentally safe and non-toxic, non-flammable and non-hazardous.

For more information visit

Originally published in Masonry magazine.

About the Author

Masonry, the official publication of the Mason Contractors Association of America, covers every aspect of the mason contractor profession - equipment and techniques, building codes and standards, business planning, promoting your business, legal issues and more. Read or subscribe to Masonry magazine at


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