Concrete driveways, patios and steps: cracking, salt damage and repair

Updated November 11, 2026 · KeystoneProGuide editorial team

Why does outdoor concrete crack and crumble?

Salt, freezing and water are the causes the public sources name. Penn State Extension says chloride from deicing salt "causes chemical changes and freeze-thaw effects in concrete structures", leading to cracks, crumbles and discoloration. It puts the cost of chloride corrosion to vehicles, bridges and roads at about $5 billion a year.

Water from storms adds its own damage. Penn State Extension says residential driveways are frequently eroded and washed out by stormwater runoff, and that water ponding on a driveway can freeze into dangerous ice after snowmelt or winter rain. Where paving meets the house, Penn State Extension also advises that downspouts emptying onto paved surfaces be redirected to lawn or garden areas, and always away from the foundation.

No government or university web page could be found for this guide on how concrete should be mixed, finished or cured for Pennsylvania winters, so this guide does not give a mix recipe or a first-winter rule.

How can you use deicer with less damage?

Use less of it, and use it only where needed. Penn State Extension's advice on deicers:

• Clear as much snow and ice as possible before applying anything.
• Spread deicer before snow and ice start to build up.
• Apply it only where people or vehicles travel.
• Follow the label; more is not more effective, only more expensive.
• Sweep up leftover salt and reuse it.
• For small areas, consider sand, kitty litter or bird seed.

Its comparison of products: rock salt (sodium chloride) is the most used and the most harmful to plants; calcium chloride costs about three times as much but about a third as much is needed; magnesium chloride can be slippery if applied wrongly; and calcium magnesium acetate is less toxic than chloride products but costs considerably more. Penn State's page compares them for water and plants, not for concrete.

On repaired concrete, the General Services Administration's patching specification says not to apply deicing salt on or near the patch until it is fully cured.

Can cracked or scaled concrete be repaired?

Repair is a recognized option. The GSA's specification for repairing historic concrete, which covers delaminated and scaled areas and cracks, shows what careful repair involves:

• Remove all unsound concrete until sound material is exposed, and clean and prime any exposed reinforcing steel against corrosion.
• Use a compatible patch. The GSA limits the patch's strength relative to the existing concrete and requires it to let vapor through.
• Treat moving cracks differently. Patching compound is "not to be used to bridge working cracks or joints"; small cracks are filled with an elastomeric sealant and wider ones are grooved and sealed.
• Watch the weather. Patching only between 40 and 86 degrees F, holding for 48 hours, with no rain expected.
• Keep it closed. No traffic or weather exposure until the patch has gained strength.

That specification is written for historic federal buildings, but the same questions apply to a step or a patio: what will be removed, what goes in, how moving cracks are handled and how long the area must stay off-limits.

When should a slab be replaced instead?

No source read sets a rule, so ask each contractor to explain why they recommend one over the other, and get both priced if the choice is close. For comparison, Angi lists mud- or slab-jacking, used for sunken slabs, at $500 to $1,300 on its foundation repair page, and HomeGuide prices brick step repair at $300 to $750 per step.

What does replacement cost?

Angi adds that removing an old driveway, pouring over asphalt or extensive leveling adds labor, and that leveling and grading for a patio can add $1,000 to $3,200. Both are national figures.

Does a new driveway or patio need a permit?

Under the state regulation, sidewalks and driveways no more than 30 inches above the adjacent ground, and not built over a basement or a story below, need no building permit unless another law or ordinance requires one. The regulation does not mention patios by name, and your municipality's own rules, including stormwater rules for new paving, still apply.

Penn State Extension notes that porous and permeable paving lets water through and can reduce runoff, but only over a carefully prepared stone base, and it needs regular cleaning, often by vacuuming, to keep from clogging.

What else should you check?

Any replacement that digs below the old slab needs an 811 call by the contractor; ask for the eleven-digit serial number. And cutting or grinding concrete releases crystalline silica dust; the Occupational Safety and Health Administration says applying water to the blade substantially reduces it, and its construction rule requires employers to control it.

For whether new paving triggers stormwater rules, see new paving and stormwater. Sidewalks in front of the house are covered in who fixes the sidewalk and curb. Contractors are on the masonry contractors page.

Sources

1. Road Salt Pollution - Moving from Monitoring to Action, Penn State Extension
2. Watershed-friendly Deicing, Penn State Extension
3. Is Stormwater Damaging My Property?, Penn State Extension
4. Roadside Guide to Clean Water: Porous and Permeable Paving Materials, Penn State Extension
5. Installation of concrete patching compounds, U.S. General Services Administration
6. 34 Pa. Code § 403.62. Permit requirements and exemptions., Commonwealth of Pennsylvania (Pennsylvania Code)
7. How Much Does a Concrete Driveway Cost in 2026?, Angi
8. How Much Does a Concrete Driveway Cost? (2026), HomeGuide
9. How Much Does a Concrete Patio Cost? [2026 Data], Angi
10. How Much Does Masonry Work and Brick Repair Cost? (2026), HomeGuide
11. How Much Does Foundation Repair Cost? [2026 Data], Angi
12. FAQs Homeowners, Pennsylvania One Call System (Pennsylvania 811)
13. How Can I Control Stormwater on My Property?, Penn State Extension
14. Silica, Crystalline - Construction, U.S. Occupational Safety and Health Administration