Epoxy and grout injection

When cracks occur in concrete that are structural in nature, the strength of the surface is compromised.

Making your structure whole

Injection is often the most practical solution to restore the structural and/or waterproofing integrity of your concrete structure.  If left untreated, the surface could fail completely, causing moisture incursion, concrete failure, or other catastrophic outcome.

Epoxy injection is a process whereby epoxy is forced under great pressure into cracks in concrete. When properly performed, the repaired crack is actually stronger than the adjacent concrete, and the integrity of the surface is restored.  The injection process is also utilized when water flows through cracks in buildings, especially in below-grade situations where access to the exterior of the surface is not practical. By injecting the crack with epoxy, not only is the integrity of the concrete restored, but also the water penetration is eliminated.

Chemical grout injection is utilized when water penetrates a surface, but not necessarily via identifiable cracks, or when there are so many cracks that injecting each one individually is not cost effective.  Using this procedure, an expanding waterproofing grout is injected through a wall surface, to the back (exterior) side of the surface. When the chemical grout encounters water or moisture, it expands to many times its original size. This grout can lay dormant for extended periods, in an “un-activated” state until it encounters water.

Urban Waterproofing uses only the highest grade injection epoxies and chemical grouts available, including Chemco, Sika, DeNeef, and Webac.

Keys to a successful project…

Is the repair structural in nature?  Is water present?  Is there soil on the backside of the wall that is being injected?   These are a few of the questions that need to be answered before selecting either epoxy or urethane grout for injection.  Urethane grout, for example, REQUIRES water to be present in order to catalyze.  Epoxy adhesive is typically used where a structural repair is needed.

Proper placement of injection ports is critical.  The spacing of ports will depend on the thickness of the concrete wall or slab.  For urethane grout injection, the ports need to be placed such that the injection intercepts the crack at its mid-thickness point.  For example, if a wall is 6” thick, the crack needs to be intercepted where it is 3” deep.
Water is very persistent.  After injecting, it is important to not only monitor the original crack that was injected, but nearby areas as well.  Water will find the paths of least resistance and can sometimes be “pushed” to other vulnerable areas on the wall or floor slab and create new leaks.

Services we provide include…

  • Epoxy Injection

  • Urethane Grout Injection

  • Blindside Curtain Injection

“By keeping constant focus on the interrelated functions performed by their crew and subcontractors, Urban [Waterproofing] completed the project within the allocated budget and ahead of schedule.Urban Waterproofing, in my eyes as Project Manager, is considered as an honest, competent, and reliable firm.”

Michael Toporkoff, UCSF