Concrete Lifting and Foundation Repair in the Treasure Valley

Family owned, based in Nampa, ID. We test the soil before we quote and back every lift with a five year guarantee.

Polyflow is a family owned concrete lifting, foundation repair, and geotechnical contractor based in Nampa, Idaho, serving the entire Treasure Valley. We raise sunken driveways, sidewalks, patios, garage floors, and shop floors using high density polyurethane foam injected through small holes drilled into the slab, and most residential jobs are finished in a single visit with the concrete ready to drive on the same day. Before we quote a repair, we use penetrometer testing to measure how compact the soil under your slab actually is, which tells us whether foam will solve the problem or whether there is a deeper soil issue that needs a different approach. Every lift we do carries a five year no settle guarantee. Call 208-780-9292 for a free estimate.

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Recent Concrete Repair Case Studies

Why Concrete Settles in the Treasure Valley

Concrete almost never fails on its own. It fails because the soil underneath it moves, and soil in this valley moves for reasons specific to where we live.

Irrigation and canal water. The valley is threaded with canals, laterals, and drains. Seasonal wetting and drying moves fine material through the sub base, and leaks or high flow periods wash out support under nearby slabs and foundations. Properties on flood irrigated lots or backing a canal settle differently than properties on city water alone.

Fill that was never fully compacted. This area has been building fast. When a lot gets graded and backfilled quickly, compaction can come up short, and the shortfall does not show itself until a few years of load and moisture cycling have compressed the fill. That is why newer subdivisions produce as many settlement calls as older neighborhoods do.

Silt soils that lose strength when wet. Much of the valley sits on wind deposited silt with low cohesion once saturated. Add water from a downspout dumping at a foundation corner, a leaking sprinkler line, or a broken service lateral, and the soil loses bearing capacity in that one spot. That is the corner drop or single sunken panel most homeowners notice first.

Freeze and thaw cycling. Our winters cycle in and out of freezing instead of staying frozen. Each cycle expands and contracts moisture in the sub base and in existing cracks, widening joints and loosening support a little more each year.

Erosion around water structures. Dams, cisterns, headgates, retaining walls, and stem walls in contact with moving water lose backfill steadily. By the time a void is visible at the surface, it is usually a good deal larger underneath.

We Test Before We Quote

Most concrete leveling quotes in this valley get built the same way. A contractor walks the site, takes a few measurements, makes an assumption about what is underneath, and hands you a price. That works fine until the problem is not what it looked like, and then you pay for the repair twice.

Polyflow uses penetrometer testing to measure the actual compactness of the soil beneath your slab before we recommend anything. The probe records resistance at increasing depth, which tells us whether we are dealing with a shallow void that foam will fix for good, or a deeper bearing capacity problem that needs deep injection or a different repair entirely.

Two things come out of that. First, you do not buy a repair that will not hold. If the readings show the sub base cannot support the slab no matter how much foam goes under it, we tell you that before you spend the money, even when it means recommending something other than a lift. Second, you do not overbuy. Testing rules problems out as often as it rules them in. Plenty of slabs that look severe need nothing more than a straightforward lift, and we can quote that with confidence instead of padding the job to cover what we do not know.

It is also why we can put a five year guarantee behind our work. We are not guessing about what is down there.

How Polyurethane Concrete Lifting Works

Polyurethane concrete lifting, sometimes called polyjacking or foam jacking, raises settled concrete by injecting expanding structural foam into the voids under the slab. We drill a pattern of small ports through the surface, inject a two part polyurethane that expands and hardens on contact, and use that controlled expansion to bring the slab back to grade. Then we patch the ports.

This replaced mudjacking, the older method that pumps a slurry of sand, cement, and water under the slab through much larger holes. Four differences matter if you are deciding between them.

Weight. Polyurethane foam weighs a fraction of what cement slurry weighs. Most settlement happens because the soil could not support the load it already had, so adding a few thousand pounds of wet slurry on top of that same soil tends to buy you a repeat failure. Foam does not add meaningful weight.

Hole size. Foam injection uses ports around [5/8 inch] across. Mudjacking needs holes closer to [1.5 to 2 inches]. Smaller patches mean a less visible repair, which matters a great deal on stamped, stained, or colored concrete.

Cure time. Polyurethane reaches structural strength within minutes. Slurry has to cure before the slab carries full load. In practical terms that is the difference between parking in your driveway that afternoon and waiting a day or more.

Water resistance. Cured polyurethane is closed cell and does not wash out. Cement slurry can erode over time when groundwater or irrigation runoff moves under the slab, which is worth thinking about on any property near a canal or on flood irrigation.

Our Three Step Process

Drilling small injection ports into a settled concrete slab

1. Test and drill. We evaluate the site, take penetrometer readings anywhere the depth is in question, and drill a pattern of small injection ports through the slab, placed to lift the concrete evenly rather than crack it.

Injecting polyurethane foam beneath a sunken concrete slab to raise it

2. Inject and lift. High density polyurethane goes in through the ports. It expands to fill every void under the slab, then builds pressure and raises the concrete. We watch elevation the whole time and stop at grade.

Patching injection ports after lifting concrete back to grade

3. Patch and clean. Ports get patched, the site gets cleaned up, and the concrete is ready to use. On most residential jobs that is the same day, often within a few hours of us pulling in.

Concrete Repair Services

Concrete Lifting and Raising

Sunken driveways, sidewalks, patios, pool decks, steps, and garage floors raised back to grade with polyurethane foam. Most jobs finish in one visit.

Foundation Repair

Settling foundations, cracked and crumbling stem walls, and out of level structures corrected with adjustable jack systems and deep injection.

Soil Stabilization

Loose, eroded, or uncompacted soil bound into a solid load bearing mass with injected polyurethane, used under slabs, foundations, and structures.

Crack and Joint Sealing

Careful preparation and sealing of joints and cracks to keep water out of the sub base, the cheapest step there is in preventing future settlement.

Surface Sealing and Protection

Penetrating sealer built for maximum depth, protecting concrete from spalling, freeze damage, de-icing salt, and surface breakdown from the inside out.

Trip Hazard Mitigation

Uneven sidewalk panels and raised slabs corrected before someone gets hurt, for homeowners, HOAs, property managers, and commercial owners.

Water Way Wall Stabilization

Void filling and soil permeation for canal walls, dams, cisterns, and headgates, forming a solid watertight mass that stops erosion where it starts.

Commercial and Industrial Lifting

Warehouse floors, shop floors, loading docks, and storage facilities lifted and stabilized with as little downtime to your operation as possible.

Geotechnical Services

Penetrometer testing, void detection, and engineered soil improvement for contractors and engineers who need to know what is underneath first.

Where We Work

Polyflow is based in Nampa and works across the full Treasure Valley, covering Ada, Canyon, Gem, and Owyhee counties.

Ada County: Boise, Meridian, Eagle, Star, Kuna, Garden City

Canyon County: Nampa, Caldwell, Middleton, Parma, Wilder, Melba, Notus, Greenleaf

Surrounding areas: Emmett, Homedale, Marsing, Mountain Home, McCall, Cascade

We travel outside the valley regularly for commercial, agricultural, and geotechnical work. If you are past this list, call us anyway at 208-780-9292 and we will tell you straight whether we can get to you.

Stylized illustration of the Boise, Idaho skyline with the state capitol and foothills

Common Questions

How long does concrete lifting take?

Most residential concrete lifting is done in a single visit, usually [X to Y hours]. The polyurethane reaches structural strength within minutes of injection, so you can generally walk on the concrete right away and drive on it the same day.

Is lifting concrete better than tearing it out and replacing it?

In most cases yes, and not only because it is faster. Replacement removes the old slab without doing anything about the soil that made it settle in the first place, so the new concrete can go the same way the old one did. Lifting also skips demolition, hauling, disposal, new forming and pouring, and the cure time before you can use the surface again.

Will the concrete settle again after you lift it?

We back all concrete lifting with a five year no settle guarantee. If concrete we lifted settles within five years, we come back and lift it again at no charge. The penetrometer testing we do before the repair is what makes that guarantee possible, because it catches the deeper soil problems that foam by itself would not fix.

Can you lift stamped, colored, or decorative concrete?

Yes, and it is the main reason people choose foam over mudjacking for decorative work. Our injection ports run around [5/8 inch] across instead of the much larger holes slurry requires. We place and patch them to keep them as invisible as possible, and the slab keeps its original surface.

What causes concrete to sink in Idaho?

Nearly all of it traces back to the soil under the slab. The usual causes here are fill that was not fully compacted under newer construction, erosion from irrigation and canal water, saturated silt soils losing bearing capacity, and repeated freeze and thaw cycling. Water is the common thread in almost every case.

Do you work on commercial and industrial buildings?

Yes. We handle warehouse and shop floors, loading docks, storage facilities, roadways, and agricultural structures like grain silos. We also do deep injection to raise the load bearing capacity of soil under existing structures, including multi story buildings.

How do I know if my problem is the concrete or the foundation?

Often you cannot tell from the surface, which is exactly why we test. A sunken driveway panel and a settling foundation can look similar from above and need completely different repairs. Penetrometer readings tell us how deep the problem goes before anyone commits to a fix.

Do you offer free estimates?

Yes. Estimates are free and we do them on site rather than over the phone, because we would rather see the problem than guess at it. Call 208-780-9292 or request an appointment through our contact page.

Our Guarantee

If we seal your cracks or joints and the concrete in that area later settles or goes uneven, we lift it free. If we lift or raise concrete for you, we guarantee it will not settle again for five years from the day we did the work. If it does, we come back and lift it again at no cost to you.

We can promise that because we test before we quote. Contractors who guess cannot.

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