Crusher Run Driveway: Depth, Tons and How to Build It Right

Crusher run is crushed stone that still has all its small pieces and rock dust mixed in. Instead of screening out the fines, the quarry leaves them in, so the stone ranges from roughly 3/4 inch or so down to powder. When it's wetted and compacted, the fines fill the gaps between the larger pieces and the whole layer locks into something close to a hard-packed surface. That's why it's one of the most popular materials for gravel driveways and for the base under asphalt.

Base and gravel tons calculator → Gravel driveway cost →

It Goes by a Lot of Names

Depending on where you live, you might hear crush and run, crusher run, dense grade aggregate (DGA), quarry process (QP), road base, or a state spec number such as 21A. Some regions sell a product called Class 5 or Item 4 that's similar in purpose but not identical in gradation. The name matters less than the description: angular crushed stone with fines, designed to compact. Ask the quarry what they recommend for driveways and whether it's crushed stone, recycled concrete, or a blend.

Crusher Run vs. Clean Stone

Property	Crusher run	Clean stone (such as #57)
Fines	Included	Screened out
Compaction	Packs very firm	Stays somewhat loose
Drainage through the layer	Slower	Fast
Surface feel	Smooth, hard	Crunchy, stones move
Typical role	Top layer on gravel drives; base under asphalt	Drainage layer, middle layer, trench fill

Many well-built gravel drives use both: coarser stone below for strength and drainage, crusher run on top for a firm driving surface.

How Deep Should Crusher Run Be?

It depends on your soil and what's underneath:

• Top layer over an existing firm stone base: a few inches compacted is common.
• New drive on decent soil: many builders use a thicker total section, sometimes with a coarser stone layer first.
• Base under asphalt: the base thickness is often several inches or more, depending on soil and traffic. See our driveway thickness guide.
• Soft or clay soil: more depth, and often a woven geotextile underneath.

How Many Tons of Crusher Run?

Suppliers sell by the ton. Crusher run is often estimated at roughly 1.4 to 1.5 tons per cubic yard, but moisture and gradation change that, and compacting it means you need more material than the finished volume suggests. Ask your supplier for their figure.

Example: 12 × 40 foot drive, 4 inches compacted

1. Area: 12 × 40 = 480 square feet
2. Volume: 480 × (4 ÷ 12) = 160 cubic feet
3. Cubic yards: 160 ÷ 27 = 5.9
4. Tons at 1.45 per cubic yard: 5.9 × 1.45 = about 8.6 tons
5. Add about 15 percent for compaction and waste: about 9.9 tons

Example: 20 × 60 foot base under asphalt, 6 inches

1. Area: 1,200 square feet
2. Volume: 1,200 × 0.5 = 600 cubic feet, or 22.2 cubic yards
3. Tons at 1.45: about 32.2 tons, or roughly 37 tons with a 15 percent allowance

Our base calculator handles any dimensions, and the gravel calculator guide explains the settings.

How to Build a Crusher Run Driveway

1. Strip and shape. Remove topsoil and organic material. Shape the subgrade with a slight crown or cross-slope so water sheds.
2. Fabric if needed. On soft ground, lay woven geotextile to keep stone and soil apart.
3. Base layer. On a new drive, many builders start with larger stone for strength and drainage.
4. Spread crusher run in lifts. Two to four inches at a time compacts better than one thick dump.
5. Moisten and compact. Slightly damp crusher run compacts best. Too dry and the fines won't bind; too wet and it pumps. Use a plate compactor or roller, making several passes.
6. Finish with a crown. Keep the center slightly higher than the edges.

Drawbacks to Know

• Dust in dry spells, since the surface has fines.
• Mud and tracking when saturated, especially if drainage is poor.
• Slower drainage through the layer than clean stone, so surface shape matters.
• Fines wash out on steep sections where water runs down the drive.
• Plowing can scrape the top; raise the blade slightly.

Maintenance

Crusher run drives need the same care as other gravel: keep the crown, fill potholes in compacted layers, and add a thin top-up every few years. See gravel driveway maintenance. If you're weighing alternatives, millings vs crusher run compares the two.

Cost

Crusher run is usually among the cheaper quarry products per ton, though price varies by region and haul distance. See gravel driveway cost for how stone, delivery, and labor add up, and get local quotes.

Bottom Line on Crusher Run Driveways

Crusher run is crushed stone with its fines left in, so it compacts into a firm, smooth surface or base. Estimate about 1.4 to 1.5 tons per cubic yard plus a compaction allowance, place it in thin moist lifts, compact well, and keep a crown so water runs off.