Two-part polyurethane through dime-sized ports, set hard in minutes, and light enough that weak soil never feels it.
Stand at the bottom of your driveway and look back up at the house. That view tells on a property. A garage apron that has stepped down away from the door reads as a dark horizontal line you can pick out from thirty yards. A front walk that tilted toward the foundation shows up as a stripe of algae stain where water sits after every storm. Porch slabs pull away from the stoop and leave a shadow gap. None of it is subtle once you know the shape of it.
Polyurethane foam fixes all of that without a demolition crew in your yard. We drill ports about the size of a dime, inject a two-part resin that expands underneath, and the slab rises back into plane while we watch it with a level. The reaction finishes in minutes. Most people are parking on it before the trailer is loaded.
| What you can see from outside | What's happening below | Whether foam is the answer |
|---|---|---|
| Dark line where the apron meets the garage slab | Utility trench or unconsolidated backfill compressing under the apron | Yes. Classic void, small lift, quick job |
| Green or black staining in one spot on a walk | The panel has tipped and water no longer runs off it | Yes, and we re-pitch it away from the house while we're there |
| Daylight visible under a porch or stoop slab | Soil pulled back or washed out, leaving the slab spanning air | Yes. Filling the gap is exactly what the resin does well |
| Stair-step drop between two drive panels | One panel lost support, the neighbor didn't | Usually. If both are cracked through, we talk about replacement first |
| Slab riding low against a hillside cut | Fill soil on a bench compressing under its own weight | Often, because foam adds almost nothing to a load already too high |
| Panels rocking or crumbled at the edges | The concrete itself has failed, not just the support | No. Lifting broken pieces just rearranges them |
The resin arrives as two liquids that stay separate until they meet in the gun. Once they mix they expand hard and fast, chasing every hollow under the slab, sealing off the loose soil, and then pushing straight up against the underside of the concrete. Cured foam is a closed-cell solid that doesn't absorb water and doesn't wash away. It weighs a few pounds per cubic foot, which is the number that matters most on Larkspur ground.
Consider what that means on a lot in Bear Dance or the stepped benches around Sage Port, where plenty of pad and driveway sits on engineered fill instead of native ground. When that fill keeps consolidating, stacking a heavy grout pad on top of it is the wrong move. Resin sidesteps the problem: you get lift and void filling without piling dead load onto soil that already announced it was struggling.
Port size is the other practical win. Dime-sized holes in stamped or exposed work patch far less conspicuously than a hole big enough to swallow a grout hose.
Send a photo taken from the street and one from up close at the joint. We'll tell you whether that's a lift or something bigger.
Resin stretches our lifting season past where grout work stops. The expansion reaction makes plenty of its own heat, so crisp late-fall afternoons stay workable, and spring opens earlier as well. The ground is still the limit. Soil frozen solid pins the slab in place, and injecting under a pinned panel is how concrete gets cracked.
Weather counts for less than most people expect, since damp soil doesn't bother the chemistry and the cure happens under the slab. Where the water goes is the part we care about. A Perry Park porch slab that dropped because a gutter has been emptying beside it for fifteen years will drop again if that gutter keeps doing it. Lift the concrete, extend the downspout, and the repair holds.
The tell on these hillside lots is always the low corner. Water comes off the slope, finds the edge of the pad, and quietly carries the fines out from underneath. From the road you just see a slab that looks tilted. Underneath there's a cavity you could lose a five-gallon bucket in. Resin fills that in about four minutes and the homeowner drives on it before we leave.Straight from the crew
Still unsure about something?
Call the crew at (303) 569-4046 and we will talk it through.
Get a free, no-obligation estimate from a crew that knows Colorado soil, Colorado weather, and how to finish concrete that lasts.
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