How to Build an Inground Fire Pit

Transform your backyard into a cozy, inviting space with an inground fire pit. This captivating feature not only adds warmth and ambiance but also increases your home's value. Here's a comprehensive guide on how to build an inground fire pit, ensuring safety, functionality, and style.

Before you start, ensure you check local building codes and obtain any necessary permits. Also, be aware of utility lines and call 811 to have them marked before digging. Now, let's dive into the step-by-step process.

Planning and Design

First, decide on the size, shape, and location of your fire pit. A common size is 4 to 6 feet in diameter, but you can adjust it based on your space and needs. Consider placing it at least 25 feet away from structures and trees for safety.

Choose a design that complements your landscape. Options include a simple, circular pit, a multi-level stone structure, or a built-in seating area with the fire pit as the centerpiece. Sketch your design or use online tools to create a visual plan.

Gathering Materials

Once you've finalized your design, gather the necessary materials. For a basic inground fire pit, you'll need:

• Shovel
• Gravel
• Fire bricks
• Concrete or mortar mix
• Reinforcing wire (optional)
• Sand (optional, for leveling)
• Bricks or stones for the outer layer (optional, for aesthetic purposes)

You may also need safety gear like gloves, safety glasses, and a dust mask.

Preparing the Site

Mark the perimeter of your fire pit using stakes and string. Then, begin digging, ensuring the depth is at least 6 inches for the gravel base and 4 inches for the fire bricks. The total depth should be around 10 to 12 inches.

Create a slight slope (about 1 inch per foot) towards the center to facilitate water drainage. Once you've reached the desired depth, smooth the bottom with a rake or shovel.

Building the Fire Pit Structure

Start by creating a base layer of gravel. This promotes drainage and prevents the fire bricks from sitting directly on the ground. Pour a 2 to 3-inch layer of gravel, spreading it evenly across the pit's bottom.

Next, lay a layer of fire bricks on top of the gravel. Fire bricks are designed to withstand high temperatures and are essential for containing the fire. Arrange them in a single layer, staggering the joints like you would with regular bricks. Leave a small gap between the bricks and the pit's edge for expansion.

Securing the Fire Bricks

To secure the fire bricks, you can use concrete or mortar. If using concrete, mix it according to the package instructions and pour it over the bricks, filling the gaps. Allow it to set for at least 24 hours before proceeding.

For a more durable bond, use mortar. Mix the mortar and apply it to the bottom of each brick as you lay them. Once the bricks are in place, apply mortar to the joints, ensuring they're well-filled. Allow the mortar to cure for at least 72 hours before using the fire pit.

Finishing Touches

If you chose to add an outer layer of bricks or stones for aesthetics, now is the time to install it. Start at the bottom and work your way up, applying mortar as you go. Ensure the outer layer is stable and well-aligned.

Once the outer layer is complete, allow the mortar to cure for at least 72 hours before using the fire pit. This ensures the structure is strong and ready for use.

Safety and Maintenance

Always prioritize safety when using your inground fire pit. Keep a safe distance from the fire, never leave it unattended, and have a water source nearby. Regularly clean the fire pit, removing any ash or debris. This helps maintain its functionality and appearance.

With proper care, your inground fire pit will provide countless hours of enjoyment, transforming your backyard into a welcoming oasis. So, gather your materials, follow these steps, and let the warmth and ambiance of a fire pit enhance your outdoor living space.