A solid driveway starts with a solid base

Land grading contractor for soft driveway bases in Southeast Wisconsin. Learn when an undercut is needed to prevent rutting. Schedule your inspection today.

Your driveway should support everyday traffic without ruts, puddles, or soft spots. In Southeast Wisconsin, freeze and thaw cycles, silty soils, and poor drainage can break down a driveway from the bottom up. When patching with gravel does not last, the problem is often a weak or saturated subgrade. That is when an undercut becomes the right fix. RLP Diversified, Inc has helped homeowners, farms, and businesses across Wisconsin rebuild weak driveway bases so they stay strong through every season.

Why driveway bases get soft in Southeast Wisconsin

Our region has clay and silt soils that hold water. Add spring snowmelt, heavy rain, and repeated freezing and thawing, and you get soft ground that pumps under tires. Over time the base and surface mix with mud, which leads to ruts and potholes. Even thick layers of new gravel can fail if the subgrade is unstable. A trusted land grading contractor understands these local soil and weather patterns and designs the fix to match them.

  • Clay and silt subgrade that retains moisture
  • High water table or nearby wetlands that feed water into the driveway
  • Insufficient ditches, culverts, or swales to move water away
  • Flat driveways with little crown that hold puddles
  • Heavy traffic from delivery trucks, trailers, or farm equipment
  • Thin or poorly compacted base layers under asphalt, concrete, or gravel

Common signs you need an undercut

Not every soft driveway needs a full rebuild, but several red flags point to a failing subgrade. If you see the signs below, a site visit from a land grading contractor is a smart next step.

  • Ruts return soon after adding fresh gravel
  • Pumping or squishing under tires after rain
  • Standing water along the drive edge or in wheel paths
  • Frost heave and deep potholes each spring
  • Asphalt alligator cracking over soft areas
  • Geotextile or fabric previously installed yet problems persist

What an undercut is and when it is required

An undercut is the controlled removal of weak or saturated soils beneath the driveway, followed by replacement with stable material and proper compaction. Undercutting isolates your driveway from poor native soil so it can carry load without deforming. It is often the correct solution when surface repairs fail and the base stays wet or soft.

How deep is the undercut

Undercut depth depends on soil conditions and driveway use. Many residential driveways need 12 to 24 inches of poor soil removed. Areas with deep organics or spring seepage may require more. RLP Diversified, Inc evaluates soil type, moisture, and expected loads to set the right depth for a lasting fix.

When a land grading contractor recommends it

An undercut is recommended when testing shows soft, pumping subgrade or when there is a history of repeated failure despite added gravel. If water seeps into the base from ditches or side hills, underdrains with fabric and clean stone are often paired with the undercut. The goal is to remove the cause of failure, not just hide the symptom.

The undercut process used by RLP Diversified, Inc

RLP Diversified, Inc follows a clear, field-tested process to rebuild driveway structure. Our crews use equipment from Caterpillar, Bobcat, and New Holland to complete work efficiently and safely.

  1. Site evaluation and markings. We review drainage, soil type, utilities, and traffic needs. We mark the limits of work and plan access for trucks and equipment.
  2. Surface removal. We strip asphalt, concrete, or top gravel and stockpile usable stone for reuse if appropriate.
  3. Undercut excavation. We remove the soft subgrade to stable soil, typically 12 to 24 inches, more if needed.
  4. Subgrade proof roll. We compact and roll the exposed subgrade to identify any remaining soft pockets and cut those out.
  5. Separation layer. We install a woven stabilization fabric over the subgrade to keep new stone from mixing with soil.
  6. Foundational lift. We place large, angular stone such as 3 inch breaker run or similar to bridge and drain water.
  7. Base lifts. We add dense graded base in layers, compacting each lift to the required density. Thickness depends on expected load.
  8. Drainage improvements. We shape a crown, cut ditches or swales, install culverts as needed, and may add edge drains to keep water moving away.
  9. Finish grading. We fine grade the surface for gravel driveways or to prepare for asphalt or concrete paving.
  10. Quality check. We verify compaction, drainage flow, and driveway elevations. We review maintenance tips with you.

Each lift is compacted to industry standards to avoid future settlement. For paved surfaces, we coordinate with your paving contractor or provide aggregate delivery to meet their specifications.

Materials that keep your driveway strong

The right materials build strength from the bottom up. Using locally available aggregates and proven geosynthetics extends service life and improves performance.

  • Woven geotextile for separation and stabilization over soft subgrade
  • Optional geogrid reinforcement in very poor soils or heavy use areas
  • Breaker run or 3 inch stone to bridge weak areas and promote drainage
  • Dense graded base such as 1.25 inch or 3/4 inch with fines for tight compaction
  • Open graded stone and edge drains where persistent groundwater is present
  • Culverts sized for upstream drainage to prevent overtopping

Drainage is the difference

Most soft driveway problems start with water. A good land grading contractor looks beyond the surface to the whole site. That includes how water enters, crosses, and leaves your driveway. RLP Diversified, Inc builds a complete plan that moves water away fast and keeps your base dry.

  • Driveway crown of at least 2 percent to shed water to both sides
  • Roadside ditches or swales with smooth flow to outfalls
  • Proper culvert sizing and clean inlets and outlets
  • Underdrains wrapped in fabric with clean stone where groundwater seeps
  • Surface regrading of adjacent lawns to direct runoff away
  • Shoreline protection and pond outlet control where water bodies influence the driveway

Alternatives and upgrades to consider

Not every site needs the same level of work. Depending on your goals and budget, RLP Diversified, Inc can recommend options.

  • Soil stabilization with cement or lime for certain clay soils
  • Thicker base layers for heavy trucks, RVs, or equipment
  • Open graded base with edge drains for chronic wet areas
  • Selective tree and brush removal to allow sun and wind to dry the surface
  • Re-route or widen the drive to avoid known springs or organics
  • Use of geogrid reinforcement for higher load capacity

Costs, timeline, and expectations

Every driveway is different. Costs depend on length and width, depth of undercut, stone type and volume, drainage features, access for trucks, and whether paving will follow. A short undercut with fabric and new base can often be completed in one to three days. Larger or wetter sites may take longer due to drying time and drainage installations. RLP Diversified, Inc provides clear estimates and schedules so you know what to expect. We can also deliver aggregates directly, which saves time and helps control costs.

The best time of year for undercut work in Wisconsin

Late spring through fall is ideal because soils are easier to compact and moisture is lower. Early spring often reveals the worst soft spots as frost leaves the ground, making it a good time to schedule an inspection. If work is urgent, winter undercut is possible when the ground is frozen, but it requires planning and may limit compaction in some soils. A qualified land grading contractor will guide you on timing for the best long-term result.

New construction vs. existing driveways

For new construction, proper stripping of topsoil, subgrade proof rolling, and staged base compaction often prevent the need for an undercut. For existing driveways that have failed, undercutting removes the contaminated base and makes room for a new, well compacted structure. RLP Diversified, Inc handles both, from rough grading to finish grading and seeding around your new drive.

Gravel, asphalt, or concrete: base needs for each surface

Gravel driveways perform well with a stable base, a good crown, and routine top dressing. Asphalt needs a strong, well compacted base to resist cracking and deformation. Concrete requires a uniform, well drained base to reduce settlement and frost heave. No matter the surface, the base is the backbone. An undercut makes that backbone solid.

Why choose RLP Diversified, Inc as your land grading contractor

RLP Diversified, Inc was founded in 2000 in Burlington, Wisconsin. After integrating Andy’s Excavating in 2013, the company expanded to offer full service grading and excavating across the state. Our crews complete driveway rebuilds, road grading, pond excavation, and demolition with an emphasis on quality and safety. We use equipment from Caterpillar, Bobcat, and New Holland to deliver reliable results.

  • Comprehensive services: grading, excavating, aggregate and trucking, demolition, pond excavation, shoreline protection
  • Skilled operators who understand local soils and drainage patterns
  • In house aggregate delivery of topsoil, fill dirt, sand, stone, gravel, and limestone
  • Proven undercut methods that protect your investment
  • Clear communication and scheduling
  • Service coverage across Wisconsin, including Southeast Wisconsin communities

Where we work in Wisconsin

RLP Diversified, Inc serves the entire state of Wisconsin. Our teams routinely work in Milwaukee, Waukesha, Racine, Kenosha, Mequon, Madison, and Green Bay, as well as nearby towns and rural areas. If you live in Southeast Wisconsin and struggle with a soft driveway base, we can help.

Frequently asked questions

Can you fix a soft driveway without undercutting

Sometimes. If the problem is minor surface erosion or a thin base, reshaping the crown and adding the correct stone may be enough. If water is the main issue, improving ditches or culverts can help. When the subgrade is soft or pumping, an undercut with fabric and proper base layers is the long term fix. A site visit from a land grading contractor will determine the right approach.

How long does an undercut last

With proper drainage and periodic maintenance, an undercut base can perform for decades. The key is to keep water out of the structure and maintain the surface shape. RLP Diversified, Inc designs the base thickness and material selection for the expected traffic on your driveway.

Will geotextile fabric trap water

No. Woven geotextile allows water to pass while separating soil from stone. This prevents mixing that weakens the base. When paired with a crown and drainage, fabric improves performance and extends the life of the driveway.

Do I need permits

Simple driveway repairs within existing limits often do not need permits. If work includes new culverts, ditch regrading, or work near wetlands or shorelines, permits may be required. RLP Diversified, Inc can advise on permitting and coordinate with local authorities when needed.

What equipment will be on site

Typical equipment includes an excavator, skid steer, roller, and dump trucks. For larger projects, dozers and graders may be used. We rely on trusted brands such as Caterpillar, Bobcat, and New Holland to ensure efficient and safe operations.

Our broader capabilities add value

Because RLP Diversified, Inc also provides pond excavation, shoreline protection, demolition, and earthmoving, we bring a full toolbox to your site. If your driveway is affected by a nearby pond or ditch, we can stabilize banks, restore flow, or adjust grades around the property. If a failing concrete slab or old retaining wall is part of the issue, our demolition and recycling services handle it safely. We also seed and restore lawns so your property looks finished when the work wraps up.

Maintenance tips after an undercut

  • Keep ditches and culverts clear of leaves and debris
  • Avoid driving on the shoulders during spring thaw
  • Add a light top dressing of surface gravel as needed to maintain crown
  • Check for standing water after heavy storms and call if you see new soft spots
  • Coordinate timing of asphalt paving with adequate base curing and compaction

Schedule your site inspection

If your driveway stays soft, ruts easily, or shows new potholes each spring, the base is likely failing. An undercut may be the smart fix. RLP Diversified, Inc will inspect your site, test the base, and outline a clear plan with options that fit your budget. Choose a land grading contractor with statewide experience and the right equipment to do the job once and do it right. Contact RLP Diversified, Inc to schedule your inspection and get a driveway that holds up to Wisconsin weather year after year.