A backyard patio that has settled, tilted, or developed significant level changes between sections is more than a cosmetic problem — it’s a safety hazard, a drainage concern, and a source of ongoing frustration. In Salt Lake City, settled patios are extremely common, driven by the region’s clay-rich soils, irrigation patterns, and the freeze-thaw cycles that gradually shift concrete year after year. Here’s how to approach the repair process smartly.
Why Patios Settle in Salt Lake City
The mechanisms of patio settlement in the Salt Lake Valley are well understood: clay soils shrink and swell with moisture changes — dramatically so in some neighborhoods. Irrigation water from adjacent lawn zones saturates soil beneath patio sections, causing consolidation over time. In areas near older trees, root decay leaves voids. And many older Salt Lake City patios were poured on inadequately prepared or poorly compacted base material that has gradually compressed under load.
Identifying the specific cause of your patio’s settlement shapes the repair approach. A patio that settled due to a single soil void from root decay is very different from one that settled because of expansive clay movement — the latter is an ongoing process that will continue to cause problems regardless of what repair is made at the surface.
Step 1: Assess the Damage
Walk the entire patio systematically. Note: the height differences between sections (use a straightedge across joints to measure), any visible cracking and its pattern, whether the concrete itself is in good condition (tap it with a hammer — hollow sounds indicate delamination or voids beneath), and where water flows on the patio surface and whether it flows toward or away from the house.
Minor settlement of 1/2 to 1 inch in isolated sections with otherwise sound concrete is a strong candidate for mudjacking. Settlement of 2 to 4 inches might still be liftable. Beyond that, or if the concrete itself is deteriorated, replacement becomes more practical.
Option 1: Mudjacking or Polyurethane Foam Lifting
For sound patio slabs that have simply settled, lifting is the most cost-effective solution. Traditional mudjacking injects a soil-cement slurry; polyurethane foam lifting uses expanding foam. Both raise the slab back to approximate original grade. Several companies in the Salt Lake area specialize in residential patio and driveway lifting — get 2 to 3 bids and ask specifically about warranty terms and their experience with Salt Lake Valley soil conditions.
After lifting, caulk the joints between patio sections with a flexible polyurethane sealant to prevent water infiltration. This is what caused or worsened the settlement in the first place, and leaving open joints invites the problem to recur.
Option 2: Grinding High Spots
When one section has settled and the adjacent section has not (or vice versa), the result is a raised edge or “lip” that creates a tripping hazard. If the height difference is small (1/4 to 3/4 inch) and lifting the settled section isn’t practical, grinding down the high side is a viable option. Concrete grinding leaves a flat, safe surface and is much less expensive than lifting or replacement. The appearance is acceptable — the ground area will be slightly lighter in color than the surrounding concrete, but this fades over time.
Option 3: Patio Section Replacement
When a specific section is severely settled, cracked, or deteriorated, replacing just that section is often more practical than lifting it. Have a concrete contractor break out the failed section, address any base problems (add compacted gravel, extend drainage), and pour a replacement section with properly specified concrete. Matching the color and finish of existing concrete is challenging — new concrete is lighter in color — but this is generally the most durable solution for severely damaged sections.
Option 4: Full Patio Replacement
When settlement is widespread, the concrete is significantly deteriorated, drainage toward the house is a concern that can’t be corrected by lifting, or the patio is simply old and worn out, full replacement is the right long-term choice. A new patio built with proper base preparation, 4,000 PSI air-entrained concrete, adequate control joints, and appropriate slope for drainage will significantly outlast the failed patio it replaces.
If replacing fully, it’s also the opportunity to address any design issues — improving drainage slope, adding control joints that were absent, or upgrading to decorative concrete.
Addressing the Underlying Cause
No repair — lifted, ground, or replaced — will last long if the underlying cause of settlement is not addressed. Common fixes include: redirecting sprinkler heads away from patio areas, extending or rerouting downspouts so roof runoff doesn’t saturate soil near the patio, having tree stumps ground out (root decay creates voids over years), and improving drainage at the perimeter of the patio with drain channels or French drains.
Final Thoughts
A sunken patio in Salt Lake City is a common problem with good solutions at multiple price points. Assess the condition of the concrete and the underlying cause before committing to a repair strategy. For sound concrete with localized settlement, lifting is usually the right value. For deteriorated or severely settled slabs, replacement builds a better long-term foundation for your backyard. And in all cases, address the drainage and soil issues that caused the problem to ensure your investment lasts.