Construction and property improvement projects often require more than just soil. Many projects also need gravel, stone, or aggregate materials to create stable surfaces, improve drainage, and support long-term performance.

One of the most common questions property owners and contractors ask is:

What type of gravel or stone material do I need for my project?

The answer depends on how the material will be used. Driveways, drainage systems, construction areas, and foundation preparation all require different material considerations.

Understanding common aggregate materials and their uses helps property owners, contractors, and developers make better decisions before ordering materials.

What Are Gravel, Stone, and Aggregate Materials?

Aggregate materials are natural or processed materials used in construction and site improvement projects.

These materials may include:

• Crushed stone.
• Gravel.
• Screened stone.
• Recycled aggregate.
• Other processed construction materials.

Unlike fill materials that primarily change elevation or fill open areas, aggregate materials often provide strength, drainage, and surface stability.

Why Are Aggregate Materials Important?

The correct aggregate material can improve the performance of a project.

For example, contractors use different materials for:

• Creating stable driveway surfaces.
• Improving drainage.
• Supporting construction areas.
• Preparing bases for concrete or asphalt.
• Stabilizing wet or uneven areas.

Choosing the correct material helps create a stronger and more reliable result.

Common Types of Gravel and Stone Materials

#57 Stone

#57 stone is a commonly used crushed stone material.

Contractors often use it for:

• Drainage applications.
• Driveway surfaces.
• Concrete preparation.
• General construction uses.

Because of its size and drainage characteristics, #57 stone works well in many site improvement applications.

21A Stone

21A stone is a processed aggregate that contains a mixture of stone particles and fines.

This material is commonly used for:

• Driveway bases.
• Roadway preparation.
• Compactable surfaces.
• General grading applications.

The combination of different particle sizes allows the material to compact and create a stable base.

Crusher Run

Crusher run contains a mixture of crushed stone and stone dust.

It is commonly used for:

• Driveway construction.
• Walkways.
• Parking areas.
• Base preparation.

When properly placed and compacted, crusher run can create a durable surface.

Drainage Stone

Drainage stone is selected for projects where water movement is important.

Common uses include:

• Drainage systems.
• French drains.
• Areas requiring water flow.
• Erosion control applications.

The correct size and placement depend on the drainage requirements of the project.

Gravel vs. Stone: What Is the Difference?

Many people use the terms gravel and stone interchangeably, but there are differences. Gravel often refers to naturally occurring rounded rock material. Crushed stone is processed by crushing larger rock into specific sizes.

The best choice depends on:

• Project requirements.
• Surface conditions.
• Drainage needs.
• Compaction goals.

How Do You Choose the Right Aggregate Material?

Before ordering gravel or stone, consider:

• What is the material being used for?
• Will vehicles travel over the surface?
• Is drainage important?
• Does the material need to compact?
• What are the site conditions?

For example, a driveway project may require a different material than a drainage improvement project.

Common Projects That Use Gravel and Stone

Aggregate materials support many construction and property improvement projects, including:

• Driveway installation.
• Driveway repairs.
• Drainage improvements.
• Concrete preparation.
• Building site preparation.
• Walkways.
• Parking areas.
• Road improvements.

Each project has different requirements, so material selection should match the intended use.

Why Proper Material Selection Matters

Using the wrong aggregate material can create problems.

Common issues include:

• Poor drainage.
• Surface instability.
• Excess maintenance.
• Material movement.
• Reduced project performance.

Therefore, selecting the correct material before delivery helps create a more successful project.

Planning Gravel and Stone Delivery

Delivery planning is an important part of any aggregate project.

Consider:

• Total quantity needed.
• Truck access.
• Placement location.
• Site conditions.
• Weather conditions.

In addition, knowing where the material will be placed before delivery helps keep the project organized.

Frequently Asked Questions About Gravel, Stone, and Aggregate Materials

What is aggregate material used for?

Aggregate materials are used for construction, drainage, roadways, driveways, foundations, and other site improvement projects.

What is the best gravel for a driveway?

The best material depends on the driveway design, traffic, drainage needs, and site conditions.

What is the difference between #57 stone and 21A stone?

#57 stone is commonly used for drainage and general applications, while 21A stone is often used where a compactable base is needed.

Can gravel improve drainage?

Yes. Certain aggregate materials allow water to move through the material and can support drainage systems.

How much gravel or stone do I need?

The amount depends on the area size, depth, material type, and project requirements.

Planning Your Aggregate Material Project

Choosing the right gravel, stone, or aggregate material helps construction and property improvement projects perform better over time. By understanding material options, project requirements, and delivery planning, property owners and construction professionals can make better decisions before ordering.

Our next Evergreen Construction Resource will explain:

“Grading, Drainage, and Site Preparation: Building a Better Foundation for Your Project.”

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