How to Build a Ground Fire Pit with Bricks

Creating a fire pit in your backyard can be a rewarding DIY project that adds both warmth and ambiance to your outdoor space. Bricks are an excellent material for this task, as they're durable, long-lasting, and can withstand high temperatures. Here's a comprehensive guide on how to build a fire pit with bricks in the ground, ensuring safety, stability, and a visually appealing result.

Before you start, ensure you've checked local building codes and obtained any necessary permits. Also, choose a location that's at least 25 feet away from structures and low-hanging branches, and preferably on a level, non-flammable surface like concrete or stone.

Preparation and Planning

Before you start digging, it's crucial to plan your fire pit's size and shape. A diameter of 4 to 6 feet is typically sufficient for most backyards, allowing for comfortable seating around the fire. Sketch out your design, considering both aesthetics and functionality.

Gather your materials and tools. You'll need bricks, gravel, sand, a shovel, a tape measure, a level, and a trowel. For this guide, we'll use standard 8-inch by 4-inch by 3-inch bricks and assume a fire pit diameter of 4 feet.

Site Preparation

Mark out the fire pit's diameter using stakes and string. Then, begin digging a hole about 12 inches deep and 4 feet wide. This depth allows for proper airflow and heat distribution. Remove any large rocks or roots as you dig.

Create a 2-inch layer of gravel at the bottom of the hole to promote drainage and prevent the bricks from sitting in water. Level the gravel using a rake or your hands.

Building the Base

Spread a 1-inch layer of sand over the gravel. This layer will help stabilize the bricks and create a smooth surface. Level the sand using a trowel or a piece of lumber.

Lay the first layer of bricks around the edge of the hole, using a level to ensure they're even. Cut any bricks as needed to fit the curve. Allow for a 2-inch gap between the bricks and the ground for air circulation.

Constructing the Walls

Begin laying the second layer of bricks, staggering the joints to create a stronger structure. Use a level to ensure each layer is even and perpendicular to the ground. Continue laying bricks in this manner, offsetting the joints, until you've reached your desired height – typically 12 to 18 inches.

As you build, periodically check that the fire pit remains round and level. Use a tape measure to ensure the diameter hasn't changed, and adjust as needed.

Creating the Firebox

Once you've reached your desired height, lay a layer of bricks flat to create the firebox floor. Ensure there's a 2-inch gap between the firebox and the outer wall for airflow. This layer should be level and stable to support the weight of the firewood.

Lay a second layer of bricks on top of the firebox floor, creating a 2-inch gap between the inner and outer walls. This gap allows heat to escape and prevents the outer wall from cracking due to excessive heat. Continue laying bricks until you've reached your desired height, ensuring the firebox remains centered and level.

Finishing Touches

Remove any excess sand or gravel from the fire pit. Allow the structure to cure for at least 72 hours before using it to ensure the bricks have fully bonded with the mortar.

Before lighting your first fire, apply a thin layer of high-temperature mortar between the joints to seal the bricks and prevent water from entering. Allow the mortar to cure according to the manufacturer's instructions.

Now that your fire pit is complete, enjoy the warmth and ambiance it brings to your backyard. Always remember to practice fire safety, keeping a bucket of water or sand nearby and never leaving the fire unattended. Happy building!