How to Build a Brick Fire Pit with Mortar

Building a brick fire pit with mortar is a rewarding DIY project that enhances your outdoor living space. Not only does it provide a cozy gathering spot, but it also adds value to your property. This comprehensive guide will walk you through the process, from planning to completion, ensuring your fire pit is both functional and aesthetically pleasing.

Before you start, ensure you have the necessary permits and check local regulations regarding fire pits. Also, choose a location that's at least 25 feet away from structures and has good drainage. Now, let's dive into the step-by-step process of building your brick fire pit with mortar.

Gathering Materials and Tools

To begin, you'll need the right materials and tools. For the fire pit, you'll need bricks, mortar, and a fire pit ring (optional). Other essentials include gravel, sand, and landscape fabric. As for tools, you'll need a trowel, level, shovel, tape measure, brick saw or wet saw, gloves, safety glasses, and a wheelbarrow.

For this guide, we'll use a simple, rectangular fire pit design. However, you can adapt the process for other shapes like circular or octagonal by adjusting the layout of your bricks.

Preparing the Site

Start by marking out the dimensions of your fire pit using stakes and string. The size depends on your preference, but a common size is 4 feet by 4 feet. Next, remove the grass and topsoil within the marked area using a shovel. The depth should be around 6 inches to accommodate the bricks and gravel.

Before laying the base, cover the area with landscape fabric to prevent weeds from growing and to help with drainage. Spread a layer of gravel (about 2 inches deep) over the fabric. This will provide a stable base for your fire pit and promote drainage.

Laying the Base Course

Mix your mortar according to the package instructions. For the base course, you'll want a mortar mix with a higher sand-to-cement ratio for better stability. Spread a layer of mortar (about 1 inch deep) over the gravel using your trowel. Ensure it's evenly distributed and level.

Begin laying your bricks on the mortar bed, starting from one corner. Use a level to ensure each brick is even and flush with the others. Leave a small gap (about 1/4 inch) between each brick for expansion. Once the first course is laid, use a rubber mallet to tap down any high spots and ensure the bricks are firmly set.

Building the Walls

Now that the base course is laid, you can start building up the walls of your fire pit. For the first few courses, use a mortar mix with a standard sand-to-cement ratio. As you build up, you can increase the cement content for stronger, more durable mortar.

Lay each course of bricks with a staggered joint pattern for added strength. This means the vertical joints of one course should be offset from the vertical joints of the course below it. Use a trowel to apply mortar to the ends and sides of each brick, as well as on the top of the course below.

Creating the Fire Pit Bowl

Once you've reached the desired height for your fire pit walls (usually around 12 to 18 inches), it's time to create the fire pit bowl. For this, you can either use a pre-made fire pit ring or build it yourself using bricks laid on edge.

If using a fire pit ring, place it in the center of your fire pit and ensure it's level. If building the bowl yourself, lay bricks on edge in a circular pattern, leaving a gap of about 2 inches between the bricks and the fire pit walls. Use mortar to secure the bricks in place.

Finishing Touches

Allow the mortar to cure for at least 72 hours before using your fire pit. Once cured, you can apply a layer of fire-resistant sealant to protect the bricks from heat and moisture. This will also help maintain the appearance of your fire pit over time.

Finally, consider adding a layer of sand or fire glass to the bottom of your fire pit bowl. This will help with drainage and provide a safe, non-combustible surface for your fires.

Your brick fire pit with mortar is now complete and ready for use. Gather some firewood, light a cozy fire, and enjoy your new outdoor living space. Don't forget to maintain your fire pit by cleaning it regularly and reapplying sealant as needed. Happy building!