Working With & Understanding Flex Base

Flex Base is a highly adaptable base material frequently used for driveways and temporary roadways. You might hear it called driveway gravel, caliche, or simply “base.” It’s typically made up of crushed rock ranging in size from 1-1/2″ down to a fine powder. This blend creates a base that is both highly compactable and flexible, making it ideal for its intended purposes.

In Texas, Flex Base intended for construction use is rigorously tested to meet the standards set by the Department of Transportation (TX-DOT). Specifically, it must adhere to TX-DOT Item #247 specifications. This testing is crucial because while many materials might be sold as “flex base,” not all meet these stringent TX-DOT standards. At Lowery Sand & Gravel, we understand the importance of quality, which is why we only offer TX-DOT Item #247 testable Flex Base. This ensures you’re getting a reliable product that will stand the test of time.

The most crucial, and often overlooked, step when working with Flex Base is proper subgrade preparation. Investing time in ensuring good water movement within the subgrade will significantly extend the life of your project. Consider this: any area that collects standing water after rain will continue to do so even after Flex Base is installed. This trapped water beneath the surface can soften the subgrade (the soil below the Flex Base), eventually leading to potholes.

Therefore, it’s wise to invest in proper grading of the subgrade to ensure effective water drainage. This might involve installing drainage pipes or simply creating a berm to redirect water flow. For accurate elevation checks, it’s recommended to hire a professional grader who uses laser leveling equipment.

Next, determine if you want your driveway or roadway to be flush with the existing ground level or raised above it. If you desire a below-grade installation, you’ll need to excavate the existing soil to accommodate the 4″ to 6″ or more of Flex Base you plan to use.

Once drainage and elevation are addressed, the next step is to calculate the amount of Flex Base needed and arrange for delivery. You can reach out to us at Lowery Sand & Gravel with your project dimensions, and we’ll gladly help you determine the necessary material quantity. You can also use our convenient calculator available on our website at lowerysand.com. We offer prompt delivery, often the next day and sometimes even on the same day!

A frequently asked question is: “How deep should the Flex Base layer be?” The answer is simple: the thicker the layer, the better the performance and longevity. While a minimum depth of 6″ is recommended (which will compact to approximately 4″), doubling that depth will yield significantly better and longer-lasting results. The biggest mistake you can make is planning for a Flex Base layer that’s only “an inch or two” thick.

Installing Flex Base is straightforward in principle, though the actual process can vary depending on your equipment proficiency. For most residential projects using a skid steer, track loader, or tractor, we recommend spreading and compacting the Flex Base in 6″ lifts (or layers). As each layer is placed, it’s important to sprinkle or “water in” the material. This moisture helps achieve maximum compaction. After spreading a 6″ layer, simply use a water hose to lightly sprinkle the Flex Base while working it in. Avoid over-saturation, but ensure the material is adequately moistened for optimal compaction and a solid, stable base.

For compaction, a track loader works well, but you can also use the tires of a skid steer or tractor. Alternatively, for smaller projects or tighter spaces, you can rent a walk-behind vibratory plate compactor. For larger areas or thicker base layers, ride-on compaction rollers are available. If you desire a thicker base course, simply repeat the layering and compaction steps.

An optional finishing touch for Flex Base driveways, roads, and approaches is topping it with a layer of material. The most common choices are a clean 1″ Limestone Rock or Recycled Asphalt Millings, typically applied in a shallow layer around 2″ thick. Both options enhance the project’s durability and appearance. Contact Lowery Sand & Gravel to explore these topping materials and discuss which might be best for your needs.