You closed in November. The buyers loved the place. Then the first spring melt comes through, and in May you get the email with a photo attached: the front stoop has pulled away from the house, and there's a 3/4" lip where the garage apron meets the garage floor.
It's not a disaster. It's a callback, and how quickly and cleanly it gets handled is what the buyers tell their neighbors about.
Here's a straight read for builders, remodelers, and GCs around Green Bay on why new flatwork moves, what to do about it, and when you don't need a lifting contractor at all.
The Backfill Ring Is Where Callbacks Start
Every basement gets dug wider than the foundation so crews have room to form walls, waterproof, and lay drain tile. Once the walls are up, that overdig gets backfilled. Compaction has to stay gentle against a fresh foundation wall, so that ring of soil often ends up looser than the undisturbed ground a few feet out.
Then the flatwork goes right on top of it: the stoop, the garage apron, the end of the front walk, and the AC pad tucked against the wall.
Northeast Wisconsin speeds things up:
- The first spring melt soaks loose backfill harder than anything else it will see.
- Downspouts and sump lines often aren't extended yet, or get knocked loose during landscaping.
- Final grade settles below the slab edges and starts draining toward the house instead of away.
- Late-fall pours sometimes go down on a base that was saturated or partly frozen.
- Frost lifts wet soil under a slab in winter and lets it back down unevenly in spring.
None of that means the flatwork sub did a bad job. It means the dirt underneath hadn't finished moving. It most often shows up after the first winter.
Callback Triage: What the Buyer Reports and What to Do
| What the homeowner reports | Likely cause | Fix | Typical urgency |
|---|---|---|---|
| Stoop pulling away from the house | Backfill settling under the stoop | Foam lift back toward the house, then caulk the gap | High. Water runs down the gap, and the threshold becomes a trip edge. |
| Garage apron dropped below the garage floor | Backfill settling at the garage foundation | Foam lift to meet the floor while keeping drainage away from the door | High before winter. Meltwater pools and freezes at the door. |
| Walk panel sunk where it meets the stoop | Backfill under the end of the walk | Foam lift | Over 1/2" is a real trip hazard. Under 1/4", monitor. |
| AC pad tipping toward the house | Backfill under the pad | Foam lift with the unit in place (see sinking AC pad) | Medium. Strain on the refrigerant lines. |
| Crack with one side lower | Settling under part of the slab | Lift the low side, then seal the crack | Medium to high, depending on height |
| Open joint at the foundation, slab still level | Slab shrinkage left a gap | Caulk, with backer rod if it's deep | Medium. Seal it before the first freeze. |
| Hairline cracks, both sides level | Normal shrinkage | Explain it to the buyer. Caulk only if it holds water. See new concrete cracking. | Low |
| Slab higher in winter, back down in spring | Frost heave in wet soil | Fix the drainage. Don't lift until the ground has thawed. | Seasonal. Reassess after thaw. |
| Flaking or scaling after the first winter | Finishing, curing, or deicer issue | Not a lifting job. Back to the flatwork sub. See concrete spalling causes. | Medium. It gets worse every winter. |
| Slab broken into several pieces | Large void or heavy loading | Usually replacement | Depends on location |
Lift It Instead of Tearing It Out
For a builder, tearing out a year-old stoop is the expensive answer to a cheap problem. In most of these callbacks, the slab isn't the defect. The soil under it is.
| Foam lifting | Tear out and repour | |
|---|---|---|
| Does it address the soil? | Foam fills voids as it lifts, weighs a few pounds per cubic foot, and won't wash out | Only if the base gets dug out and recompacted. Otherwise the new slab sits on the same backfill. |
| Finished grade and landscaping | Left alone | Usually torn up along the slab |
| Homeowner impact | Walk on it right away, drive on it the same day | Entry or garage blocked for days |
| What the buyer sees afterward | Small patched holes, about the size of a dime | A brand-new slab next to year-old flatwork |
| Time on site | A few hours for most single-home callbacks | Demo, forming, pouring, and curing |
| Relative cost | A fraction of replacement | The highest option |
The foam goes in small, controlled increments, so a stoop comes back to the house without getting shoved into the siding or threshold. More on that in precise concrete lifting.
Working Around Closings and Frozen Ground
Timing is half of builder work in Wisconsin.
- Before closing: If settling shows up on the pre-closing walkthrough and the ground isn't frozen, fix it then. It's easier than a callback.
- Winter closings: Nobody should be lifting on frozen ground. If a buyer flags a stoop in January, put it on a written spring list with a target month.
- First spring: A quick look at stoops, aprons, and the foundation gap on recent closings catches problems before the buyer has to ask.
- Caulking needs clean, dry, frost-free joints and roughly 40°F or warmer. Late summer and early fall are the easy window.
- Sealers and coatings on new concrete have to wait for the slab to cure. About 28 days is the common starting point on product labels, sometimes longer, and coatings also need the slab to pass a moisture test.
Close the Foundation Gap Before Winter
The joint where a stoop, walk, or apron meets the house is the most important joint on a new home's exterior. Left open, it funnels roof runoff and snowmelt straight into the backfill, the soil most likely to settle.
The order matters: lift first, patch the holes, then seal. Caulking a slab that's still tipped toward the house locks it in the wrong position. We use a flexible polyurethane joint sealant, with closed-cell backer rod where the joint is deep, on clean, dry, frost-free joints. Caulking where concrete meets the house covers the details.
The other half is water. Downspouts extended well away from the flatwork, sump discharge pointed away from the house, and grade that falls away from the foundation (the national model code target for new homes is at least 6 inches in the first 10 feet) do more to keep a lifted slab in place than anything else. See how to extend downspouts.
Add-Ons: Coatings, Sealing, and Construction Cleanup
Not every builder call is a fix. A few add-ons fit well on an options sheet or a punch list:
- Garage floor coatings. A coated floor stands up to salt brine and drips and cleans up easily. The slab has to cure and pass a moisture test first, so it usually works best as a post-closing upgrade scheduled a month or more after the pour. See our garage floor coatings page.
- Penetrating sealer on exterior flatwork. A silane or siloxane sealer soaks in, helps the concrete resist water and deicing salt, and doesn't leave a slippery film. It goes on after the label's cure time, so it suits summer and early-fall pours.
- Cleanup after the trades leave. Construction marks up new flatwork: mud tracks, tire marks from equipment, rust from steel left lying on the slab, and paint or drywall mud spills. Most of it cleans off once the heavy work is done.
Wisconsin's Right-to-Cure Process
Wisconsin gives residential contractors a chance to fix defects before a lawsuit. Under the state's right-to-cure law (Wis. Stat. 895.07), contractors give customers a notice about construction defect claims when they sign a construction or remodeling contract. A homeowner with a claim then has to deliver written notice first. The contractor generally has 15 working days to respond in writing (with a repair offer, a settlement, both, a request to inspect, or a rejection), and the homeowner can't sue until at least 90 working days after the notice.
The practical side: when a flatwork complaint lands, you have a short window to answer with a specific plan, and a fast photo quote helps you put a real repair offer in writing. (Plain-language summary, not legal advice.)
How We Work With Builders
- One photo quote per address. Send the address, a wide shot of each problem area, and a close-up of the worst edge with a tape measure standing next to it. You get a quote for that address.
- Several addresses at once. Callbacks across a subdivision can go in together, and we'll try to schedule nearby addresses on the same trip.
- We can coordinate with the homeowner. If you'd rather skip the phone tag, we can contact the buyer directly to set a date and walk the slabs with them, and keep you copied.
- Before and after photos. You get them for your warranty file.
- A straight answer when it isn't ours. If the photos show shrinkage cracks, scaling, or a broken slab, we'll say so, and you can send it to the right trade.
When You Don't Need Us
Hairline shrinkage cracks, surface scaling, and slabs that heaved this winter aren't lifting jobs (the triage table says who handles each). Broken or crumbling slabs need replacement. Foundation wall cracks go to a structural engineer.