411 Stone: the Driveway Topping Ohio Lanes Are Finished With

Nine loads in ten leave for the same job in this state: a gravel drive or a parking apron that has thinned out to bare clay in the wheel tracks and needs a running surface put back on it. That is what 411 stone is asked to do here. It is crushed to about an inch and under and carries its own stone dust, so when it is damp and rolled the fines wedge around the larger pieces and the layer stiffens up instead of scattering. On glacial till that goes greasy after rain, a surface that knits together is the difference between a lane you can drive in April and one you can only look at.

ODOT writes this material as Item 411, stabilized crushed aggregate, which is how suppliers and contractors specify it here. The item number is how the material is described in an Ohio spec, not a certification held by this storefront.

Can 411 stone be the finished surface, or only the layer underneath?

Both, and the difference is what sits below it. Over a properly built and compacted base it makes a good finished surface, which is exactly how most gravel drives in the state are put together: a course of 304 aggregate base carrying the load, then 411 limestone rolled on top to run on. Laid straight onto soft ground with nothing under it, it behaves like any other thin layer on clay and pumps itself into the subgrade within a season.

Under pavers and flagstone it works the other way round, as the compacted layer that the bedding and the stone sit on. It is not the bedding itself.

How thick should it go for a car, and for the truck and trailer?

For a single-car drive on ground that drains, most jobs here are planned as roughly 4 inches of compacted base with 2 inches of 411 limestone rolled over it. A lane carrying a loaded pickup, a stock trailer or a tractor wants more underneath, commonly 6 inches or better of base, with the same topping thickness on the surface. Adding depth to the surface course does not fix a thin base; it just gives you deeper ruts to grade out.

The thing to plan around is not the frost line. Frost runs to roughly 32 inches through much of the state and near 36 inches in parts of the north, well below anything you are going to build. What you control is whether water sits in the clay under the stone through the winter, so crown the surface, give it somewhere to fall away to, and keep the ditch or the swale open.

Will it work under a flagstone walkway?

As the compacted layer, yes. Set a flagstone path on this material and the stones stop rocking, because the compacted layer spreads foot load instead of letting each piece find its own level in soft soil. The sequence that holds up on till is a compacted 411 layer, then a thin screeded bedding course of mason sand or screenings, then the flagstone, then the joints filled.

What you should not do is skip the compaction because the path is only for walking. Repeated freezing and thawing lifts anything set on loose ground, and a walk that rocks in its second spring was almost always laid on material that was never rolled.

Why keep it out of raised vegetable beds?

Because it is crushed limestone with fines in it, and neither part belongs in a growing mix. The fines pack hard and shed water rather than holding it, and limestone dust moves soil pH in a direction most vegetables do not want. Raised beds want garden soil, with top soil beneath it if the boxes are deep. Where 411 stone does help around a vegetable garden is the path between the beds, compacted firm so a loaded wheelbarrow does not sink in wet spring ground.

How many yards for a 12 by 60 single-car drive?

Take a hypothetical drive, 12 feet wide and 60 feet long, getting a 4 inch surface course.

• Area: 12 x 60 = 720 square feet
• Depth: 4 inches = 0.333 feet
• Volume: 720 x 0.333 = 240 cubic feet
• Cubic yards: 240 / 27 = 8.9 cubic yards

Call it 9 cubic yards for the drive, plus a little for the spread at the edges and the settlement the roller takes out. The tonnage depends on the density figure applied to this material, so run the same three measurements through the 411 stone calculator and let it do that step.

A hypothetical parking apron beside the same drive, 20 feet by 24 feet at 3 inches, works out as 20 x 24 = 480 square feet, 480 x 0.25 = 120 cubic feet, 120 / 27 = 4.4 cubic yards. Converted at the weight this site publishes for crusher run and road base, about 3,000 lb per cubic yard or 1.50 tons per yard, that is roughly 13.5 tons for the drive and about 6.6 tons for the apron, both approximate.

How do you stop it creeping off the edge or down the slope?

On anything steeper than a gentle grade, gravity and runoff move the surface downhill a little every storm, and the material ends up in a bank at the bottom. Two things slow it down. Give the water somewhere to go before it reaches the running surface, with a cross drain, a water bar or a ditch cut above the grade, so the drive is not doing double duty as a channel. Then hold the sides, with timber, steel edging, a mown shoulder built up to grade, or a row of larger stone where the slope is severe.

Damp material compacts far better than dry, which is the other half of keeping it in place. Roll it when it is damp rather than on the first hot week in July, and the fines lock instead of blowing off.

Ordering a load and getting it where you want it

Pick a quantity and a delivery date on this page; delivery is arranged at checkout from the ZIP code you enter. The truck needs a clear run in and room to lift a bed, so move the trailer, trim the low branch over the lane, and stake the drop if you want the pile somewhere specific. On soft spring ground, walk the lane before the day and be honest about whether it will carry a loaded truck.

Measure the area, put it through the calculator, then set your date and quantity above. If the drive has a soft stretch you are unsure about, send the dimensions through the contact page and Ohio Rock Supply can talk the depth through with you.