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Concrete Driveways in Denver, CO

Quick answer

A durable driveway in the Denver metro starts with a compacted subgrade and gravel base, is commonly about four inches thick (more for trucks and RVs), uses air-entrained concrete to resist freeze-thaw and deicers, and has planned control joints plus isolation at the garage. Keep runoff away from the edges. The apron and curb cut usually need a city right-of-way permit.

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A driveway in the Denver metro has a hard life. It sits on soil that can swell and shrink with moisture, freezes and thaws dozens of times in a typical winter, gets dosed with whatever deicer comes off your tires, and bakes under strong high-altitude sun in summer. A well-built driveway handles all of that for decades. One poured on a poor base, without enough joints, or cured carelessly can heave, crack or flake within a few winters.

What goes into a durable driveway here

  1. Tear-out and excavation. The old slab or asphalt is broken out and hauled away, and the ground is dug to make room for a base.
  2. Subgrade work. Soft spots and organic soil are removed, and the subgrade is shaped and compacted. On Front Range clay, contractors also pay attention to moisture: clay that dries out badly before a pour, or gets soaked, can move afterward.
  3. Base. A compacted layer of gravel or road base gives the slab uniform support. On sites with known swelling soil, some contractors or engineers call for a deeper layer of non-expansive fill.
  4. Forms and drainage. The slab should slope away from the garage and house so snowmelt and rain run toward the street, not toward the foundation.
  5. Reinforcement. Rebar, welded wire or fiber-reinforced mixes help hold cracks tight. They don't stop concrete from cracking.
  6. Placing, finishing and joints. Control joints are tooled or saw-cut at planned spacing so shrinkage cracks form along straight lines.
  7. Curing. The surface is kept moist or sealed with a curing compound, which matters a lot in Denver's dry air.

Thickness and mix

Residential driveways are commonly poured about four inches thick, and five inches or more is often recommended where trucks, trailers or RVs park. Because the Denver area sees repeated freeze-thaw cycles and deicing chemicals every winter, exterior flatwork here is typically poured with air-entrained concrete. The Portland Cement Association and the American Concrete Institute both explain how the tiny air bubbles give freezing water somewhere to go, which protects the surface from scaling.

Swelling soil and the garage edge

The Colorado Geological Survey lists cracked and heaved driveways and garage floors among the most common signs of expansive clay. Driveways often heave or drop where they meet the garage slab, where downspouts discharge, and along edges next to watered lawns. A good plan includes isolation joints at the garage and foundation, downspout extensions that carry water past the slab, and sprinklers adjusted so they don't soak the edges.

The apron, the sidewalk and the alley

The part of the driveway between your property line and the street, along with any curb cut and the public sidewalk it crosses, usually sits in the public right-of-way. Cities around Denver regulate that work closely. The City and County of Denver, for example, requires a right-of-way contractor license, such as its Cement Sidewalk Contractor license, for laying sidewalks and driveways and making curb cuts in the public way. Aurora, Lakewood and Arvada have their own contractor registration and permit rules. Many older Denver homes are reached from an alley, and alley approaches can carry their own requirements. Ask who pulls the permit and confirm the contractor is licensed for right-of-way work in your city.

After the pour

  • Keep vehicles off until your contractor says it's ready, often about a week.
  • Skip deicing chemicals during the first winter and shovel instead. Sand helps with traction.
  • Ask whether and when to apply a penetrating sealer to help resist water and salt.
  • Keep downspout extensions in place so runoff doesn't soak the soil at the edges.

Questions to ask

  • How thick will the slab be, and what base, depth and reinforcement are included?
  • Is the mix air-entrained for exterior use?
  • Where will control and isolation joints go?
  • Who handles the right-of-way permit, tear-out and disposal?
  • What does the warranty cover, and can you provide a certificate of insurance?

Thinking about replacing a heaved driveway? Read our guide to what drives driveway replacement cost in Denver, then request a driveway contractor with photos of the existing slab.

See how it works

How a concrete mixer truck delivers a pour. Press the buttons to run each step and see what happens inside. Made with Colorfigures ·
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Frequently asked questions

Do I need a permit to replace my driveway in Denver?

Work in the public right-of-way, such as the apron, curb cut or public sidewalk, generally needs a permit and a contractor licensed by the city for right-of-way work. Denver, Aurora, Lakewood and Arvada each have their own licensing and permit rules, so check with your city before work starts.

Why does my driveway heave near the garage?

Along the Front Range, a common cause is expansive clay that swells when it gets wet, often from downspouts, snowmelt or sprinklers near the garage. Settling backfill can cause the opposite, a drop. A contractor can help tell which you have and what to fix first.

Should I use deicer on a new concrete driveway?

Contractors commonly advise skipping deicing chemicals during the first winter. Shovel promptly and use sand for traction. After that, follow the product label and use as little as you need, since deicers contribute to surface scaling.

Sources and further reading

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