how to make a concrete bench mold

Mastering Concrete: Crafting a Bench Mold

By Steven MillerMay 1, 2026

Creating a durable and attractive concrete bench for your outdoor space involves careful planning and the right techniques. By crafting a concrete bench mold, you can ensure your bench is both functional and visually appealing. Let's dive into the process of making a concrete bench mold, step by step.

Before you begin, consider the size and design of your bench. A standard concrete bench is around 6 feet long, 1.5 feet deep, and 1.5 feet tall. However, you can adjust these measurements to suit your needs. Additionally, decide on the design – will it be a simple rectangular bench or something more intricate with curves or cutouts?

Gathering Materials and Tools

To create your concrete bench mold, you'll need specific materials and tools. Here's a list to help you get started:

Stone Cold Beautiful: How To Build a Concrete Bench

Build a Concrete Park Bench Using Concrete Bench Molds

How to Make an Impressive Concrete Landscape Bench

Materials: Melamine or plywood, screws, wood glue, concrete mix, aggregate (optional), waterproofing agent, mold release agent, and concrete sealer. Tools: Circular saw, jigsaw, tape measure, pencil, drill, screwdriver, trowel, float, and rubber gloves.

Creating the Mold Base

Begin by constructing the base of your mold using melamine or plywood. Cut the wood to the desired length and width of your bench, ensuring the pieces are flat and smooth. Assemble the base using screws and wood glue, creating a sturdy foundation for your mold.

Add charm to your garden with beautiful wooden or stone garden benches

a wooden bench sitting on top of a pile of gravel next to a grass field

For a simple rectangular bench, you'll need two long pieces for the length and two shorter pieces for the depth. If you're creating a more complex design, you may need to cut additional pieces to accommodate curves or cutouts.

Building the Mold Sides and Back

Next, construct the sides and back of your mold. Measure and cut the wood pieces to match the height and width of your bench. Attach these pieces to the base using screws and wood glue, creating a box-like structure. Ensure the corners are square and the seams are tight to prevent leaks during the concrete pouring process.

If your bench design includes curves or cutouts, you'll need to create additional mold pieces to accommodate these features. Use a jigsaw to cut the necessary shapes, ensuring they fit snugly within the mold.

Top 6 problems with concrete countertop mix designs and how to prevent them

How to Build A Stone Inlay Concrete Bench

a wooden bench sitting on top of a lush green field

Preparing the Mold for Concrete

Before pouring the concrete, it's essential to prepare your mold to ensure a smooth finish and easy removal of the final product.

First, apply a mold release agent to the interior of your mold. This will help prevent the concrete from sticking to the wood and make it easier to remove the mold once the concrete has cured. Allow the release agent to dry completely before proceeding.

Mixing the Concrete

Mix your concrete according to the manufacturer's instructions, adding water slowly until you achieve the desired consistency. For a stronger bench, consider adding aggregate to the mix. A waterproofing agent can also be added to protect the concrete from moisture and freezing temperatures.

My latest DIY project was these concrete and recycled Oregon bench seats! 👌🏼

an open box sitting on top of a tarp covered ground next to some tools

How to Build a Custom Outdoor Sofa - Room for Tuesday

a stone bench is shown with instructions for how to make it look like it's made out of concrete

How to Build a DIY Modern Concrete and Redwood Bench Tutorial

If you're using a concrete mix with a built-in waterproofing agent, you can skip this step. However, it's always a good idea to consult the manufacturer's guidelines to ensure you're using the product correctly.

Pouring the Concrete

Once your mold is prepared and the concrete is mixed, it's time to pour. Begin by pouring the concrete into one corner of the mold, allowing it to spread and fill the mold evenly. Use a trowel to smooth the surface and remove any air bubbles. Then, use a float to level the concrete and create a smooth finish.

If your bench design includes curves or cutouts, use a trowel or brush to carefully work the concrete into these areas, ensuring they are completely filled. Allow the concrete to cure according to the manufacturer's instructions, usually around 24-48 hours before removing the mold.

Finishing and Sealing the Concrete Bench

After the concrete has cured and the mold has been removed, it's time to finish and seal your bench. Begin by using a trowel or brush to smooth any rough edges or surfaces. If necessary, use a concrete sealer to protect the bench from moisture and stains. Allow the sealer to dry completely before using the bench.

Regular maintenance, such as cleaning and reapplying sealer as needed, will help ensure your concrete bench remains durable and attractive for years to come.

Creating a concrete bench mold is a rewarding project that allows you to customize your outdoor space with a functional and attractive piece of furniture. By following these steps and taking your time, you can create a durable and visually appealing bench that will serve you well for many years. Happy building!