Cracks in a concrete driveway, patio, or walkway are almost universal among Salt Lake City homeowners — Utah’s freeze-thaw cycles, clay soils, and temperature extremes make some degree of cracking virtually inevitable over time. The good news is that many cracks can be repaired by homeowners without professional help, often at very low cost. The key is matching the right repair method to the type and severity of the crack. Here’s a complete guide.
First: Assess the Crack
Not all cracks are equal, and the right repair approach depends on the nature of the crack. Ask these questions before reaching for a repair product:
How wide is it? Hairline cracks (less than 1/16 inch) are cosmetic. Cracks from 1/16 to 1/4 inch are moderate. Cracks wider than 1/4 inch are significant. How deep is it? Shallow cracks are surface cracks only. Cracks that go through the full depth of the slab are structural cracks. Is there vertical displacement? If one side of the crack is higher than the other, there’s been soil movement. Is it growing? Mark the ends of the crack with pencil and check in a few weeks — an active, growing crack requires a different approach than a stable one.
Hairline Cracks: Liquid Crack Filler
For hairline cracks and very narrow cracks up to 1/8 inch wide, a liquid concrete crack filler or concrete caulk works well. Clean the crack with a wire brush and blow out debris with compressed air. Apply the liquid filler, allowing it to wick into the crack by capillary action. Smooth the surface and allow to cure. This approach is primarily cosmetic — it keeps water out of the crack, which prevents freeze-thaw widening, but provides little structural contribution.
Medium Cracks (1/8 to 1/2 Inch): Polyurethane or Epoxy Filler
Cracks in this range require a more substantial repair. Polyurethane concrete caulk (sold in cartridges for standard caulk guns) is flexible, durable, and handles the movement concrete experiences through Salt Lake City’s temperature swings. It’s the best choice for control joints that have cracked and for surface cracks that are stable.
Epoxy crack filler is harder and stronger but also more rigid — it works well for structural repairs where movement is not expected. For deep cracks, use backer rod (foam cord) to fill the depth of the crack before applying caulk, leaving a 1/4 to 1/2 inch depth for the sealant layer.
Preparation is critical: clean the crack thoroughly, remove all loose material, and ensure the crack walls are dry before applying any filler. In Salt Lake City, choose a dry day with temperatures between 50°F and 80°F for best results.
Wide Cracks and Broken Edges: Patching Compound
For cracks wider than 1/2 inch, broken slab edges, or areas with missing material, use a cement-based patching compound or vinyl concrete patcher. The key technique for lasting repairs is undercutting: use a chisel and hammer or angle grinder to cut the crack walls to create a wider base than surface opening (a reverse taper). This mechanical “key” locks the patch into the concrete rather than allowing it to pop out.
Brush or spray the repair area with a concrete bonding adhesive before applying the patch — this dramatically improves adhesion. Mix the patching compound per instructions, pack it firmly into the crack, overfill slightly, and screed it flush. Apply a broom finish to match the surrounding surface. Keep the patch moist for 24 to 48 hours to ensure proper curing.
Cracks with Vertical Displacement: Address the Cause First
If one side of a crack is higher than the other, there’s been differential settlement beneath the slab. Simply filling the crack without addressing the cause will result in the repair failing — often quickly. The underlying soil issue needs to be evaluated. Options include mudjacking (injecting grout beneath the settled section to lift it) or grinding down the high edge. A local concrete contractor can assess what’s causing the displacement and recommend the appropriate solution before any surface repair is attempted.
Active, Growing Cracks
If you’ve marked the ends of a crack and it continues to grow, the underlying cause is still active — usually ongoing soil movement or thermal stress. Filling an active crack is largely futile; it will re-crack. Address the root cause — improve drainage if water infiltration is contributing to soil movement, consult with a contractor about the structural situation, and use flexible, movement-accommodating repair materials rather than rigid patching compounds.
Products Available at Salt Lake City Hardware Stores
Quikrete offers a full range of concrete repair products available at most Salt Lake area hardware stores: Concrete Crack Seal for liquid applications, Self-Leveling Polyurethane Sealant for wider cracks, and Vinyl Concrete Patcher for larger repairs. DAP and Sika also make quality products in the same categories. Read labels carefully to ensure the product is rated for exterior use and freeze-thaw conditions.
After Repair: Seal the Surface
Once repairs are complete and fully cured (allow at least 7 days), apply a penetrating concrete sealer over the repaired area and ideally the entire slab. Sealing fills microscopic pores that remain vulnerable to water infiltration and freeze-thaw damage. It’s the final step that makes the difference between a repair that lasts and one that deteriorates again in the first Utah winter.
Final Thoughts
Concrete crack repair is one of the most accessible DIY maintenance tasks for Salt Lake City homeowners. Clean the crack thoroughly, match the product to the crack type, prepare the repair area properly, and seal afterward. Address small cracks promptly before they become large ones — in Utah’s climate, a crack that’s ignored through one winter is noticeably worse by spring.