Polyurethane injected through dime-sized ports, expanding under the slab and hardening in about fifteen minutes.
Newer neighborhoods have a settlement story of their own, and it has nothing to do with old concrete. Homes out in Lagae Ranch and BellaMesa went up on pads that were cut, filled, and compacted by machine, and the trenches around them got backfilled fast because a schedule said so. Give that ground five or six winters of moisture cycling and the loose material finds its own level. The house is fine. The flatwork poured on top of the backfill is what drops.
That's the call we take most often out here: a nearly new front walk with a lip at the third joint, a garage apron pulling away, a patio corner tilting back toward a foundation that cost a fortune to waterproof. Polyurethane foam fixes that quietly. Ports the size of a dime, a two-part resin injected under pressure, and a slab back on grade before the crew has finished their coffee.
Two liquids meet in the gun, react, and expand into a closed-cell solid that pushes against whatever is above it. That expansion is the lifting force. Within roughly fifteen minutes the material has reached working strength, which is why a driveway apron injected before lunch can take a car by dinner.
The property type is what usually decides it. Castle Pines homes tend to arrive with irrigation heads, low-voltage wire, dry-stack stone, and mature plantings crowded right up to the concrete. Foam runs off a hose from a truck at the curb, needs almost no staging area, and leaves ports you can cover with a quarter. And because the cured material is a tiny fraction of the weight of a sand-cement grout, we're not adding meaningful load to a fill pad that already proved it settles. On engineered fill, that lightness is the whole argument.
It's also indifferent to water. Closed-cell polyurethane doesn't absorb, doesn't wash out, and doesn't soften when spring runoff pushes through the soil under a hillside walk. On a sloped lot, that matters more than most homeowners expect.
We start with a laser and a straightedge, not a hose. Every panel gets a reading so we know the drop in numbers instead of adjectives, and we mark the direction the water currently runs. Then we look for the cause. A splash block that stops six inches from the wall. A sump discharge aimed at the walkway. An irrigation zone that's been soaking the same strip of backfill twice a day for four years.
Castle Pines North holds slightly older stock than the newer filings, and the failures there read differently: longer exposure, more freeze-thaw cycles worked into the joints, sometimes a slab that's both settled and surface-worn. Lifting a panel whose top has already scaled just gives you a level bad surface. We say that out loud when it's true.
| Foam | Slurry | |
|---|---|---|
| Hole size | About five eighths of an inch, patched nearly invisibly | Roughly an inch and a half, patch is findable up close |
| Weight added | A few pounds per cubic foot | Over a hundred pounds per cubic foot |
| Ready to use | Minutes | Hours to a day, depending on the load |
| Water behavior | Closed cell, does not absorb or erode | Cures solid, but fines can migrate if drainage is bad |
| Best fit | Engineered fill, finished landscaping, tight access, thin or decorative slabs | Deep voids under heavy flatwork where fill volume is the main cost driver |
| Wrong fit | Deep large voids where volume gets expensive | Weak or compressible soil that shouldn't carry more load |
One visit, one laser reading, one straight answer about whether foam solves it. Estimates are free.
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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