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No, hairline cracks in concrete are generally not a problem as they do not impact the strength and longevity of the concrete. Generally, cracks less than 0.3 millimeter wide don’t impact the structure. Hairline cracks can grow over time and weaken the structure, such as in a home foundation. Some hairline cracks can also cause leaks in a foundation. It’s important to watch the cracks to see if they grow. Contact a concrete contractor if you notice cracks exceeding 0.3 millimeter wide.

The average cost to repair a concrete driveway ranges from approximately $830 to $2,800, with a typical project costing around $1,765. The price varies widely depending on the type and extent of the damage. Minor crack repairs can be as low as $0.10 to $0.15 per linear foot and may be a DIY project. More significant repairs are priced per square foot: replacing a damaged slab costs about $6 to $14, while raising or leveling sunken concrete costs $3 to $25. Resurfacing is another option, costing around $3 to $5 per square foot. Factors influencing the total price include the size of the affected area, whether reinforcement is needed, and labor costs.

Yes—as long as the area has been properly prepped. Different self-leveling brands and compounds have their own specific instructions for preparation; some may require that you add primer or grind the surface. Without proper preparation of the surface, the compound will not be able to fully bond to the concrete and fill the cure as a separate layer, which makes it prone to chipping.

Small cracks should be filled with a flexible crack filler, like a rubberized asphalt-emulsion crack filler or a flexible masonry crack filler. Larger cracks need something a bit more solid to prevent further movement and to avoid having to use too much of the flexible filler. For concrete, you can use a concrete backer rod while asphalt can handle sand, gravel, or even dirt.