Class A Roadstone, Sand and Gravel Delivery in Johnson County, IA
Iowa Rock Supply sells gravel, stone and aggregate delivery in Johnson County, IA. Spring rain on saturated clay is the hard part of the year here, and the answer is Class A roadstone.
Class A roadstone is crushed limestone with the fines left in, so it binds and compacts under a drive, a parking pad, a shed base or a farm lane.
Materials delivered in Johnson County
Start with the project. A drive wants roadstone.
A patio wants screenings and sand. A drain wants clean rock.
Class A roadstone is the standard Iowa base course.
Ground conditions across Johnson County
Across the Southern Iowa Drift Plain, old pre-Illinoian till sits under a windblown loess mantle, usually 5 to 30 feet thick. Buried paleosols lie beneath it.
The Yarmouth-Sangamon paleosol is a thick, gummy grey clay that water will not move through. Farmers working it call it gumbo.
That clay changes how a base gets built. Ground drains at the surface but the subsoil does not take water, so it perches and runs off, and drives go soft at the bottom of a grade.
This is Iowa's most eroded landscape. Streams cut deeply, hillslopes carry rills, and gully and stream bank erosion after heavy rain is why rock goes in on slopes and outlets.
The working season here is the longest in the state. Clay soils still need to dry before anything gets compacted, so a wet spring pushes base work back several weeks.
Cold winters bring repeated freeze-thaw, milder than the north but still enough to heave gravel drives and lanes every spring. Frost depth is commonly 42 inches, and the local building official sets footing depth.
Delivery across Johnson County
Order online and pick a quantity by the ton or by the yard. Each product page has a calculator to help size the load.
A dump truck tips the load on site in one pile. Iowa Rock Supply delivers across the county, including Iowa City, Coralville, North Liberty, Tiffin, Solon, Lone Tree, Swisher and Oxford.
Choosing the right material
Johnson County sits on the Southern Iowa Drift Plain, and the neighbours do not all match it. Linn County and Benton County sit on the Iowan Surface, where loamy glacial till was planed down by cold-climate erosion.
That ground carries a thin, patchy loess cover, a residual stone line or pebble band near the surface, and large granite and quartzite erratics in the fields. Limestone bedrock is shallow along the eastern edge.
Muscatine County is different again, a Mississippi River corridor of sand, gravel, silt and clay on terraces and floodplain, with sandy blow ground on older terraces and till and loess uplands behind the bluff line.
On Johnson County's clay, a fines-bearing roadstone that binds and compacts is the base for drives and pads. Where water has to move, clean rock is the open graded choice.
On the Iowan Surface counties, the pebble band and shallow limestone change what a base sits on. On the river terraces, sandy ground drains faster and holds a base differently.
Order Class A roadstone for Johnson County
Class A roadstone is the Iowa base course for drives, pads and lanes, and it is the material this county's clay ground asks for. Iowa Rock Supply sells it alongside clean rock, screenings, sand, topsoil and riprap.
Order online for delivery across Johnson County.