How to Make Concrete Edging Molds

Creating concrete edging molds is a rewarding DIY project that can enhance the appearance of your landscape or driveway. By making your own molds, you can customize the design and save money compared to purchasing pre-made edging. Here's a comprehensive guide on how to make concrete edging molds that will last and look great.

Before we dive into the process, it's essential to understand that making concrete edging molds requires patience, attention to detail, and some basic carpentry skills. Gather your materials, allocate enough time, and follow these steps to create durable and attractive concrete edging.

Materials and Tools

To create concrete edging molds, you'll need the following materials and tools:

• Cedar or pressure-treated lumber (for mold sides and base)
• 2x4 lumber (for mold supports)
• Galvanized screws
• Concrete mix (quick-setting is recommended)
• Concrete sealer
• Tape measure
• Circular saw
• Drill and driver bits
• Hammer
• Clamps
• Level
• Gloves
• Safety glasses
• Dust mask

Design and Planning

Before cutting any wood, decide on the shape and size of your edging. Simple, straight designs are easiest for beginners. Sketch your design, and measure the length and height of your edging. Keep in mind that the mold will create an upside-down version of your design, so plan accordingly.

Once you have your design, transfer the measurements to your lumber. Use a tape measure and pencil to mark the cuts you'll make with the circular saw. It's helpful to create a full-scale drawing of your design on the ground using chalk or spray paint to ensure everything fits together correctly.

Building the Mold

With your design and measurements in hand, it's time to build the mold. Start by cutting the base and sides of the mold from cedar or pressure-treated lumber. The base should be slightly larger than the footprint of your edging to accommodate the mold supports. The sides should be tall enough to create the desired height of your edging.

Assemble the mold by attaching the sides to the base using galvanized screws. Ensure the mold is square by measuring diagonally from corner to corner. If the diagonals are equal, the mold is square. Use clamps to hold the mold together while you attach the supports.

Cut 2x4 lumber into strips to create supports for the mold. These strips will help maintain the shape of the edging as the concrete cures. Place the supports inside the mold, spacing them evenly apart. Secure the supports to the base and sides of the mold using galvanized screws.

Preparing the Mold for Concrete

Before pouring the concrete, prepare the mold to ensure a smooth and attractive finished product. Begin by applying a mold release agent to the interior of the mold. This will help prevent the concrete from sticking to the mold and make it easier to remove the edging once it has cured.

Next, create a backing board to support the mold while you pour the concrete. Cut a piece of plywood or oriented strand board (OSB) to fit the bottom of the mold. This board will help distribute the weight of the concrete evenly and prevent the mold from warping as the concrete cures.

Mixing and Pouring Concrete

Mix the concrete according to the manufacturer's instructions, using a quick-setting mix for faster curing. Once the concrete is mixed, pour it into the mold, filling it to the desired height of your edging. Use a trowel or screed to level the concrete and remove any excess.

Tap the mold gently on the ground to remove air bubbles and ensure the concrete settles evenly. Allow the concrete to cure according to the manufacturer's instructions, typically 24-48 hours. During this time, keep the mold moist to prevent the concrete from drying out too quickly.

Removing the Mold and Finishing the Edging

Once the concrete has cured, carefully remove the mold by unscrewing the sides and base. The edging should slide out easily with the help of the mold release agent. If any concrete sticks to the mold, use a chisel and hammer to gently tap it loose.

Apply a concrete sealer to the edging to protect it from moisture and stains. Allow the sealer to dry according to the manufacturer's instructions before installing the edging in your landscape or driveway.

Installing the Concrete Edging

Before installing the edging, prepare the area by excavating a trench to the desired depth. The trench should be slightly wider than the edging to accommodate gravel or sand backfill. Level the trench using a rake or shovel.

Place the edging in the trench, ensuring it is level and plumb. Backfill around the edging with gravel or sand, tamping it down as you go to create a solid base. Fill the trench with soil, and gently slope it away from the edging to direct water away from your landscape or driveway.

Congratulations! You've successfully created and installed custom concrete edging. With proper maintenance, your edging will last for years, enhancing the appearance of your outdoor space. Now that you've mastered the art of making concrete edging molds, consider exploring other DIY concrete projects to further customize your landscape.