Crushed Stone, Gravel, Topsoil and Mulch Delivery in Denton, TX

Swelling Clay Over Marl

The USDA soil survey maps Wilson-Urban land complex, 0 to 2 percent slopes, at the ZIP's center point. The Wilson series makes up 55 percent of the map unit, and urban land accounts for 30 percent. The top mineral layer is clay loam.^[1]

Shrink-swell in the top 100 cm at that point rates high, at 7.5 percent linear extensibility. Clay this active expands after rain and pulls apart into wide cracks in a dry summer. Slabs, pavers and walls set straight on it move with those swings.^[1]

The survey rates the Wilson soil moderately well drained, in hydrologic group D, the group with the slowest intake and the most runoff. Water sits on top of the clay or runs off rather than soaking in. A flat lot on ground of 0 to 2 percent slope needs a planned path for that water.^[1]

The USGS state geologic compilation shows Grayson Marl and Main Street Limestone, undivided, under the center point. It is an Early Cretaceous unit of marlstone and limestone. Marl is a limey clay-rich rock, and when it weathers it tends to produce the kind of heavy, sticky clay soil common across this part of North Texas.^[2]

For most yard projects the rock lies well below what a shovel reaches. Its influence shows up in the clay above it, which is why fabric, a thick base and good drainage come up again and again in the advice that follows.^[2]

Storms and Short Winters

Denton 2 SE, TX, roughly 3 miles away, is the NOAA normals station for the area. It averages 38.4 inches of precipitation a year, and it sees 38 days with a low of 32 F or colder in an average year.^[3]

At Denton 2 SE the median last spring freeze is March 13. The median first fall freeze there comes November 20. Spring planting can start early, and fall is a good season to set out shrubs and trees while the soil is still warm.^[3]

Rain tends to come in heavy storms with long dry spells between, which is exactly what makes high shrink-swell clay move. Each storm swells it and each drought shrinks it. Stone surfaces and mulched beds that even out those wet and dry swings take some of the stress off the clay beneath.^[1],[3]

Patios, Drives and Parking Pads

On high shrink-swell clay, a patio needs distance between the pavers and the clay. Dig out the top layer of clay loam, lay a woven fabric, and build a thick base of Road Base compacted in thin lifts. The base spreads the load and buffers the patio from the clay's movement.^[1]

Set pavers on a smooth bed of Concrete Sand or Stone Dust Screenings. Slope the finished surface away from the house so rain runs off instead of soaking into the clay at the foundation. Keep downspouts aimed away from the patio edge.^[1]

For a looser seating area, 3/8" Crushed Stone or Decomposed Granite over the same compacted base works well. Loose stone shifts a little with the clay rather than cracking, which makes it a forgiving choice on active soil.^[1]

A gravel drive on clay loam needs a fabric layer and a deep base. Without fabric, wet clay pushes up into the stone and the drive slowly turns into mud. Strip the topsoil, shape a slight crown, lay fabric, and build up Road Base or 1-1/2" Crushed Gravel in compacted lifts.^[1]

Top the drive with 3/4" Crushed Stone or Driveway Gravel for a clean face, or with Crushed Concrete for a harder, grey finish. Line the low edge with Drain Rock so storm water leaves the drive rather than soaking into the clay under it.^[1]

The Texas Department of Transportation's standard base is Flexible Base, written up in Item 247 of the Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges (2024). State road crews depend on a well-graded, compacted rock course over clay, and a home drive follows the same logic.^[4]

Homes Near the Center

The Census Bureau counts 13,814 housing units in ZIP 76201, and 28 percent are detached single-family houses. The median home in the ZIP was built in 1982. Owners occupy 19 percent of the lived-in homes.^[5]

Denton overall has 60,531 housing units, 56 percent of them detached, with a median year built of 1997. A ZIP with many rentals and apartments sends a lot of smaller orders: mulch and soil for shared beds, gravel for a parking strip, or sand and stone for a small patio. Landlords and managers also order fill to level low spots after storms.^[5]

Beds and Drainage on Clay

Clay loam holds nutrients well but drains slowly and packs hard. Mix Compost into beds every year to open the soil up. Raised beds filled with Garden Soil drain faster after storms and give roots a break from the wet clay below.^[1]

Mulch keeps clay from crusting and cracking in summer. Brown Shredded Mulch, Black Shredded Mulch and Red Mulch all work in beds. Wood Chips are a good fit under trees. A thick layer evens out soil moisture, which also eases the clay's swelling and shrinking.^[1]

Where water stands in the yard after a storm, a French drain helps. Dig a trench to a lower spot or the street, line it with fabric, fill it with Drain Rock or #57 Crushed Stone, and add a perforated pipe on long runs. River Rock splash beds under downspouts keep roof water away from the foundation.^[1]

Foundations, Fill and Moisture

On clay with high shrink-swell, the soil right next to a house matters most. Ground that stays evenly moist moves less than ground that swings from soaked to bone dry. Grade the soil so it slopes away from the foundation, and keep beds along the house mulched so the clay under them does not bake and crack in summer.^[1]

When a low spot near the house needs filling, use Fill Dirt compacted in thin layers and topped with Topsoil, sloped away from the wall. Avoid piling loose soil or mulch against siding, and keep a gap between bed edges and the slab. A strip of River Rock along a slab edge is a tidy way to keep mulch back.^[1]

For walks and paths across clay, loose surfaces forgive movement better than rigid ones. Walkway Gravel and 3/8" Crushed Stone over fabric and a compacted base flex a little as the clay swells, and a rake puts them back in order. Concrete walks set straight on the clay tend to crack and tilt over the years.^[1]

Fill Sand has a role under sheds and small slabs, where a level, firm pad matters. Compact it in thin passes over fabric, and keep it inside a frame or border so the clay around it does not squeeze it out when wet.^[1]