Crack injection and basement sealing in McGinley Square, Jersey City (07306)

McGinley Square buildings span a long stretch of construction history. Pre-war apartment buildings have brick or block foundations, two-family houses have mixed foundations, and later additions often have poured concrete walls with tie-rod holes left by the concrete formwork. Each type cracks differently. Poured walls show thin vertical shrinkage cracks, block walls crack along mortar joints, and brick walls lose mortar. When groundwater or roof runoff reaches those openings, water follows the crack and leaves a stain shaped like a river delta on the wall. Saint Peter's University sits close by, and the side streets around it have a long run of these mixed buildings.

Crack leaks are often the easiest leaks to fix, as long as the crack is the actual entry and not just where the water appears. We check above and around it: is a leader dumping right outside, is the soil sloping toward the wall, is the stain spreading from a tie-rod hole instead? When the crack is the true path, foundation crack repair by injection seals it from inside without excavating the yard, which matters a lot on blocks where the yard is tiny or shared. If roof water is the real cause, we reroute it first.

Injection is quiet, compact work, which suits occupied buildings. We clean the crack, set small ports along it, seal the surface and pump material in from the bottom up until it fills the crack through the full wall thickness. Polyurethane foam reacts with water and expands, so it suits wet, active cracks. Epoxy cures hard and bonds the concrete, so it suits dry cracks where we want structural strength. Tie-rod holes get the same treatment with a single port or a hydraulic plug. After it cures we trim the ports flush and check the crack again in the next heavy rain to confirm it is dry.

For apartment buildings we schedule with the owner or super, work in the boiler room or storage areas during the day and leave the basement clean each night. Parking around the Montgomery Street and Bergen Avenue junction is tight, but injection gear fits in a few cases, so we carry it in without staging a big truck. If a crack keeps widening, injection alone is not the answer, and we explain why. Cracks that grow, especially horizontal ones, may point to a bowing wall that needs anchors or bracing. We would rather tell you that up front than sell you an injection that fails within a year.