Cracks in concrete walls can be repaired with a liquid or paste elastomeric compound. The compound is injected into the crack with a bottle or forced into the crack with a spatula. Use a small chisel to pull out loose concrete drill bits if necessary. If you find that moisture seeps through the wall generally, rather than through some specific points, you will need to seal the concrete.
Ross suggested that I simply clean the wall thoroughly, patch the places where the siding has broken, repaint, and then install a flashing that wraps around the top of the concrete and the top edge of the imitation brick to help prevent that edge from crumbling again. Repairing cracks in a concrete wall is a simple procedure that can usually be completed in a day or so. Cracks in concrete walls, such as basement walls, can quickly develop into larger cracks and can let moisture through. If you find any cracks or rust spots around the remnants of tie wires (these are the ones that held the shapes in place when the concrete was installed), cut a gap about an inch deep and at least an inch wide and put it in with one of the mortar products.
Resurfacing concrete walls can rejuvenate old, brittle walls while maintaining the durability of the structure and protecting it from further damage from leaks or deterioration. Concrete walls that need to be structurally sound can be repaired with a low-pressure crack injection method. Epoxy products can be used to fill cracks up to ½ inch wide, but will not adhere to wet or “green” concrete. Cracks that form in a concrete wall, particularly a basement wall due to sedimentation, frost heave, or ground movement, can be structural or non-structural.
Before you begin repairing the crack, use any combination of a wire brush, vacuum, or pressure washer to remove oil, dirt, or debris from the concrete wall surface and inside the crack. This will guide rain runoff around the outside of the imitation brick and keep it out of the brick-concrete joint. Then fill the concrete in the crack until it is completely filled; do not leave a depression along the surface of the patch. There are many products available that can be used to fill and seal the crack, including ready-mix concrete.
Easy, inexpensive, and easy to do yourself, the main purpose of this concrete repair is to prevent water from seeping into the basement. Concrete walls are more common in basements and are prone to water and chemical damage that causes discoloration, cracking, and leaks. Therefore, before you finish your basement or even for an uninhabited but dry basement, one component of your waterproofing plan should be to repair cracks in concrete walls.