Class A Roadstone, Sand and Gravel Delivery in Union County, IA
Spring rain on saturated clay is the worst of it across the Southern Iowa Drift Plain. Water perches on the gummy grey clay under the loess, runs off the slope, and leaves drives soft at the bottom of a grade.
Iowa Rock Supply delivers gravel, stone and aggregate delivery in Union County, IA by the ton, and Class A roadstone is the crushed limestone base course that answers that ground.
Materials delivered in Union County
Class A roadstone is the 3/4 inch crushed limestone base course with the fines left in, so it binds and compacts.
11, and county engineers and city entrance standards write the same material as Class A roadstone.
Order it for driveways, parking pads, shed bases and farm lanes. The rest of the sizes run from coarse to fine.
Ground conditions across Union County
Old pre-Illinoian till sits under a windblown loess mantle on the Southern Iowa Drift Plain. Buried paleosols lie beneath, and the Yarmouth-Sangamon paleosol is a thick, gummy grey clay that water will not move through.
Farmers call working in it gumbo.
That clay changes how you build. Water that gets through the loess stops at the clay and sits, so a drive needs a drainage layer as much as a hard surface.
Clean rock in a subdrain carries that perched water away.
This is Iowa's most eroded landscape. Streams cut deeply and hillslopes carry a fine texture of rills, so gully and stream bank erosion after heavy rain is the main reason rock goes on slopes and outlets.
Riprap armors those banks.
The Southern Iowa Drift Plain has the longest working season in the state, but clay soils need to dry before anything gets compacted. A wet spring pushes base work back several weeks, so time a delivery for a dry stretch.
Cold winters bring repeated freeze and thaw, milder than the north but still enough to heave gravel drives and lanes every spring.
Delivery across Union County
Iowa Rock Supply covers Creston, Afton, Lorimor, Shannon City, Cromwell and Thayer with bulk delivery. Order online, choose a quantity by the ton or by the yard, and pick a delivery date at checkout.
A dump truck arrives and tips the load in one pile on site. Each product page has a calculator to help size the load before you order.
Choosing the right material
Madison County, Clarke County and Decatur County all sit on the same Southern Iowa Drift Plain ground as Union County. Old pre-Illinoian till under loess, with that gummy grey paleosol clay beneath, is the same story on all four.
Nothing about the base or drainage choice changes across those county lines. Class A roadstone for a compacted base and clean rock for drainage work the same way on all of it.
Common questions about roadstone and gravel in Union County
What is Class A roadstone and what is it used for in Union County?
Class A roadstone is 3/4 inch crushed limestone with the fines left in, so it binds and compacts into a base course.
11, and county engineers and city entrance standards call the same material Class A roadstone. In Union County it goes under driveways, parking pads, shed bases and farm lanes, where the clay subsoil needs a bound surface above it.
How deep should a gravel driveway base be in Union County?
Depth depends on your ground and what the drive carries, so plan it against the site rather than a single figure. The clay beneath the loess does not take water, so water perches and softens the bottom of a grade, and the base and the drainage have to answer that together.
Frost depth is commonly 42 inches, and the local building official sets footing depth. Take any footing figure from the official who sets it.
How much gravel do I need for my project?
Quantities are ordered by the ton or by the yard. Each product page has a calculator to help you size the load before you order.
Measure your area and check the product page for the material you want, then choose your quantity and pick a delivery date at checkout.
Order roadstone, sand and gravel in Union County
Iowa Rock Supply delivers Class A roadstone, drainage stone, sand, topsoil and decorative rock across Union County, including Creston, Afton, Lorimor, Shannon City, Cromwell and Thayer.
Choose your material, size the load by the ton or yard, and pick a delivery date at checkout. Order online and a dump truck tips your load on site.