| Horizontal concrete slab, such as a patio or floor |
Shallow surface wear, small spalls, or minor surface deterioration |
Cement-based resurfacer or repair mortar rated for the repair depth |
Can restore a worn surface or fill localized shallow damage when used within the material’s specified thickness. |
Remove loose concrete and contaminants. Check whether the product requires a dampened substrate, bonding agent, or a specific curing method. |
| Concrete driveway or walkway |
Small chips, edge breaks, or shallow isolated spalls |
Exterior-rated patching mortar or concrete repair mix suitable for traffic exposure |
A repair mix formulated for exterior use may better suit exposure to weather and foot or vehicle traffic than an interior-only patch. |
Match the repair depth and exposure requirements. A patch may not stop recurring movement or correct a failing base. |
| Vertical concrete wall or foundation surface |
Small voids, chipped corners, or localized surface loss |
Vertical or overhead repair mortar labeled for the intended application |
A non-sag formulation is designed to stay in place on vertical surfaces during application. |
Remove unsound material and follow the stated layer-thickness limits. Large or deep structural damage needs professional assessment. |
| Narrow, stable crack in concrete |
A non-moving crack with no significant displacement |
Crack filler or injectable repair material specified for the crack width and location |
A material designed for crack filling can enter or bridge a narrow crack more effectively than a coarse patch mix. |
Identify the cause first. Moving, widening, leaking, or displaced cracks may require a flexible joint treatment or specialist repair rather than rigid filler. |
| Concrete expansion or control joint |
Failed or missing joint sealant |
Flexible concrete joint sealant compatible with the joint and expected movement |
Flexible sealants accommodate joint movement; rigid patching material can restrict movement and may crack or debond. |
Clean and prepare the joint as directed. Use appropriate backer material when specified, and do not seal a joint that must remain open for drainage. |
| Concrete step, curb, or slab edge |
Broken corner or localized edge spall |
Formable repair mortar suitable for edge repairs and the required repair depth |
A formable mortar can rebuild a defined edge when properly supported and applied within its instructions. |
Use a sound, clean substrate and temporary formwork if needed. Repairs exposed to de-icing salts or repeated freeze-thaw cycles need suitable exterior-rated materials. |
| Concrete with deep, extensive, or recurring damage |
Deep spalling, exposed reinforcement, significant settlement, or wide structural cracks |
A repair system selected after assessment; structural repairs may require engineered methods |
Material choice depends on the cause, depth, reinforcement condition, load, and whether the damage is active. |
Do not treat a surface patch as a structural fix. Consult a qualified concrete professional or structural engineer when safety or load-bearing capacity may be affected. |