Epoxy Crack
Injection
in Maryland

Epoxy injection fills a crack with a rigid, high-strength material. Once cured, the crack is bonded as strongly as or stronger than the surrounding concrete. This works well when the crack is structurally stable — not actively widening or moving — and when the goal is structural restoration rather than just waterproofing. Epoxy is appropriate for cracks in slabs and walls that are no longer moving, in controlled-temperature environments, and where structural integrity is the primary concern.

OBW's Artery Method takes a fundamentally different approach. A channel is cut along the crack, stainless steel wire mesh is embedded, and hydraulic cement is packed in to create a repair that is mechanically bonded and slightly flexible. The hydraulic cement cures hard but has enough flex to accommodate the small seasonal wall movement that Maryland's Piedmont clay imposes on foundation walls — the same expansion and contraction cycle that re-opens epoxy repairs after a few seasons.

The honest answer to 'which is better' depends on your specific crack, your soil conditions, and the wall type. OBW recommends epoxy injection in a limited number of situations — primarily stable slab cracks in commercial settings — and the Artery Method for the majority of Maryland residential foundation wall cracks.

Epoxy injection is appropriate for cracks that are confirmed structurally stable — meaning the movement that caused the crack has stopped, the crack has not widened in at least one to two full seasonal cycles, and there is no ongoing drainage or settlement cause. In these cases, the rigidity of epoxy is an advantage: it restores the full load-bearing continuity of the cracked section.

Specific applications where OBW recommends epoxy injection: structural cracks in poured concrete basement walls where the crack is a single through-crack with no associated leaning or bowing; cracks in slab foundations in climate-controlled commercial buildings where freeze-thaw movement will not affect the repair; cracks in grade beams and footings where rigid restoration is needed before surface repair.

We do not recommend epoxy for cracks in block walls (block-to-block movement will re-open the repair), for any crack in a wall that is also experiencing lateral movement, or for cracks in exterior applications subject to freeze-thaw cycling. In all of these cases, the Artery Method or polyurethane foam injection is more appropriate.

Polyurethane foam injection is used for cracks that are actively admitting water — particularly wet or seeping cracks. Unlike epoxy, polyurethane foam is hydrophilic: it actually expands on contact with water as it cures, which allows it to fill and seal the crack even in the presence of active moisture. The cured foam is flexible rather than rigid.

The trade-off is that polyurethane is a moisture seal, not a structural repair. It stops water infiltration effectively for a period, but it does not restore the structural integrity of the crack. For a poured concrete wall with an isolated crack that is leaking but is otherwise stable (no bowing, no settlement, no adjacent structural concern), polyurethane injection can be a cost-effective moisture control option.

OBW uses polyurethane foam injection selectively — primarily in commercial applications where a crack needs to be sealed quickly to prevent damage to flooring or contents, and where the crack is known to be stable structurally. For most residential wall cracks, the Artery Method is still preferred because it addresses both water infiltration and long-term durability in Maryland's seasonal movement environment.

When used in the right application — a stable crack in a poured concrete wall or slab, in a controlled environment, with the underlying cause of cracking resolved — epoxy injection can last indefinitely. Properly installed epoxy injection creates a bond that is typically stronger than the surrounding concrete. The crack becomes a structurally sound section of the wall.

When used in the wrong application — a crack that is still subject to movement from seasonal soil pressure, a block wall where block-mortar movement can't be eliminated, or a crack without drainage correction — epoxy repairs re-open within one to three freeze-thaw seasons. The failure is not the epoxy itself; it's that the forces that opened the crack in the first place reopened it around or through the repair.

This is why OBW is honest about when epoxy is and isn't the right tool. A $400 epoxy injection that re-opens in two years is not a solution. The Artery Method or a structural repair addressing the movement source is.

OBW's Lifetime Transferable Guarantee covers work where the repair method is matched to the application. For crack repairs using epoxy injection in appropriate applications — stable poured concrete cracks with no underlying movement driver — the work is covered by our standard guarantee.

For crack repairs using the Artery Method, the Lifetime Transferable Guarantee applies as well — and this is the repair OBW most often installs for Maryland residential foundations. The Artery Method's flex-capable repair holds up to the seasonal movement that would re-open an epoxy repair, which is why we stand behind it for the life of the structure.

We will be explicit during quoting about which repair method we're recommending for your crack and why. The guarantee terms are explained before any work begins.