What is graded aggregate base and what is it used for in DeKalb County?

Graded aggregate base, called GAB locally, is a blend of crushed stone and fines that compacts into a firm, load-bearing layer. In DeKalb County it goes under driveways, parking pads and building pads, and it is the standard base material over red clay.

How deep should a gravel driveway base be in DeKalb County?

Depth depends on the clay under it and the weight the drive will carry. Soft, wet red clay needs a thicker lift than firm ground, often built in two compacted layers rather than one. Use a thin layer for a topping course, and go deeper for the structural base under new construction.

How much gravel do I need for my project?

Measure the length and width of the area, then multiply by the depth you want. That gives you a volume, which converts to tons based on the material. Order by the ton or the yard, and add a little extra for compaction and for the soft spots red clay tends to hide.

Order Graded Aggregate Base in DeKalb County, GA

Georgia Rock Supply handles gravel, stone and aggregate delivery in DeKalb County, GA. This is Piedmont red clay country, and that ground decides how deep your base has to be. Graded aggregate base, which local crews call GAB, is the standard answer for driveways and building pads here. Red clay sheds water fast on slopes but holds it once saturated, so a base laid on wet clay turns soft and ruts under load.

Materials Delivered in DeKalb County

We stock the sizes DeKalb contractors ask for by name, from the coarsest stone down to the finest bedding material. Here is how the sizes break down and what each one is good for.

Graded aggregate base carries the most weight in most DeKalb projects. It is the mix of stone and fines that locks together under a plate compactor and holds a driveway or pad shape.

Above that base, the choice comes down to drainage and finish. #57 Granite and Drain Rock move water away from a wall or a footing. RipRap and surge stone armor a creek bank or culvert end where storm runoff cuts into bare clay. For a walkable finish, #89 Crushed Stone and Screenings sit tight and stay put.

Ground Conditions Across DeKalb County

Work runs most of the year here. What stops trucks and base work is saturated red clay after a long wet spell, a winter rain, or tropical storm remnants pushing through. Time a delivery for a dry stretch and the same base compacts far better.

The subsoil is red clay formed from weathered granite, gneiss and other crystalline rock. Past erosion left little topsoil in places, and hard rock sits close to the surface in spots. That means you may hit refusal before you reach your planned depth, so plan on a thicker lift of GAB where the clay is soft.

Light freezes are common from November into March, and freezing rain and ice are the main winter hazard in the northern part of the region. Frost depth is shallow, and the Georgia residential code sets a 12 inch minimum footing depth. Base depth here is carried by wet red clay and drainage, not frost heave.

Bare red clay also washes away quickly on slopes, cut banks and new grading. Sediment reaches ditches and streams after heavy storms. Line those areas with rip rap or surge stone, and keep a drainage layer under any pad that sits on flat ground.

Delivery Across DeKalb County

We deliver bulk material across the county, including Atlanta, Tucker, Decatur, Clarkston, Scottdale, Stone Mountain, Avondale Estates and Lithonia. Order online and size your load by the ton or the yard, whichever your project numbers are already in.

Typical lead time depends on the material and the haul, so confirm your window when you order. A bulk delivery means a dump truck backs to your site and spreads or tailgates the load where you want it. Clear the access path first and mark any soft ground the truck should avoid.

If your driveway is narrow or the grade is steep, tell us before the truck rolls. Wet clay near a driveway edge is the most common reason a delivery has to be staged short of the pour point.

Choosing the Right Material

Fulton, Gwinnett and Clayton counties all sit in the same Metro Atlanta region and the same Piedmont red clay hills ground zone as DeKalb. The ground is similar across all four, so the material choice usually follows the project rather than the county line.

What shifts next door is the mix of work. A denser stretch of older housing means more paver bedding and drainage behind walls, which pushes you toward screenings and #57 granite. Newer grading and larger lots lean toward GAB, fill dirt and rip rap for slope protection.

Across all four counties, the deciding question is the same: does water leave the site, or sit on it? Where it sits, add a drainage layer and a coarser first course. Where it leaves fast on a slope, armor the cut bank before the next storm moves your clay downhill.

Order Bulk Gravel and Stone in DeKalb County

Georgia Rock Supply delivers graded aggregate base, crushed stone, sand, topsoil and mulch across DeKalb County, from Atlanta and Decatur to Stone Mountain and Lithonia. Pick the material, enter the depth and area in the calculator, and it sizes the load for you. Order online when your ground is dry and ready.

Bulk Gravel and Stone Delivery in DeKalb County, GA