Build DIY Outdoor Fireplace: Step-by-Step Guide

Picture this: a crisp autumn evening, the scent of woodsmoke lingering in the air, and the warmth of an outdoor fireplace keeping you and your loved ones cozy under the stars. Building a DIY outdoor fireplace can transform your backyard into an inviting, cozy sanctuary. Let's dive into creating your perfect backyard oasis with a step-by-step guide on how to build an outdoor fireplace.

Before we start, a quick word on safety - always double-check local building codes and ensure you have the necessary permits. Also, place your fireplace at least 15 feet away from your home, trees, and other structures to prevent fire hazards.

Choosing Your Design and Materials

Outdoor fireplaces come in various shapes and sizes, from modern, sleek designs to classic, rustic styles. The choice of design depends on your personal preference and the aesthetic of your backyard. For materials, consider durability and low maintenance. Concrete blocks, brick, or stone are excellent choices for their longevity and rustic appeal.

For this guide, we'll create a simple, classic brick outdoor fireplace using common building materials and tools.

Tools and Materials You'll Need

• Bricks ( unikens or queen size
• Firebrick
• Concrete mix
• Gravel
• Masonry adhesive
• Spirit level
• Tape measure
• Trowel
• Brick trowel
• Shovel
• Gloves
• Safety glasses

Preparing the Site

Choose a flat, stable area for your fireplace. Remove any vegetation, and mark out the size of your fireplace using stakes and a string line. The exact size depends on your preferences, but a common size is a 3 x 3 foot pit with a 20-inch wide chimney.

Dig out the soil to a depth of about 4-5 inches, creating a level base for your fireplace. Add a 2-inch layer of gravel for drainage, and cover it with a layer of sand to create a smooth, even surface.

Building the Fireplace Foundation

The foundation is the base on which your fireplace will rest. It ensures the stability and longevity of your structure. Mix a batch of concrete according to the package instructions and spread a 2-inch layer over the sand, ensuring the base is level and even.

Laying the First Course

Starting from one corner, apply masonry adhesive to the back of a brick using a trowel. Place the brick on the concrete, pressing it firmly into the adhesive. Continue this process, using a spirit level to ensure each brick is level and flush with the others, creating the first course of your fireplace.

Repeat this process for the second course, staggering the joints to create a strong bond. Laying bricks in this offset pattern distributes the weight evenly and prevents water from seeping through. Continue laying bricks in this staggered pattern, building up the walls of your fireplace. After every five or six courses, use a spirit level to ensure the walls remain plumb and square.

Adding the Firebrick

Once you've reached the desired height for your fireplace pit, stop laying standard bricks and start using firebrick for the inner lining. Firebrick can withstand high temperatures and provides insulation. Lay the firebrick in a single layer, creating a platform about 6 inches deep and 12 inches wide for holding firewood.

Ensure the firebrick is level and centered within the walls of your fireplace. Allowing for proper airflow, create small gaps between the firebrick and the inner walls of your fireplace.

Building the Chimney

The chimney is crucial for drawing smoke away from the fire. Begin building the chimney at the top of the firebrick platform, using the same bricklaying technique. Create a small opening at the base of the chimney for Smoke circulation, and ensure the chimney is at least 20 inches wide and 6 feet tall for proper draft.

Finishing Touches

Once you've reached your desired chimney height, lay a final course of bricks at the top, creating a neat, even surface. Allow the concrete and mortar to cure according to the manufacturer's instructions before lighting your first fire. Clean the surface of your fireplace with a wire brush and water to remove any excess mortar.

Consider adding decorative elements such as stone facades, a mantel, or a fireplace screen to enhance the aesthetic appeal of your outdoor space.

Now, gather some chairs, a cozy blanket, and a good book, and enjoy the fruits of your labor. Your DIY outdoor fireplace is more than just a structure; it's a testament to your skill, creativity, and hard work, a symbol of warmth and togetherness in your backyard oasis.