How To Build Outdoor Fireplace With Cinder Blocks

Building an Outdoor Fireplace with Cinder Blocks: A Step-by-Step Guide

An outdoor fireplace can be an excellent addition to any backyard, providing warmth, ambiance, and a place to gather with friends and family. If you're looking for a budget-friendly way to build an outdoor fireplace, consider using cinder blocks. Cinder blocks are affordable, sturdy, and easy to work with, making them a great option for DIYers.

Materials You'll Need:

Cinder blocks
Landscape glue
Fire-resistant mortar
Firebricks
Fireplace grate
Chimney cap
Concrete mix

Step-by-Step Instructions:

1. Plan and Prepare the Site:

Choose a level site for your fireplace and remove any debris or vegetation. Dig a foundation trench that is 12 inches wide and 12 inches deep around the perimeter of your fireplace.

2. Lay the First Course:

Apply landscape glue to the bottom of the first row of cinder blocks and place them in the foundation trench. Ensure the blocks are level and square using a level and a straightedge.

3. Build the Walls:

Continue stacking cinder blocks using landscape glue to hold them together. Stagger the joints between each row to create a stronger structure.

4. Create the Firebox:

Line the inside of the fireplace with firebricks using fire-resistant mortar. Install the fireplace grate at the bottom of the firebox.

5. Install the Chimney:

Build a chimney of cinder blocks above the firebox. Use fire-resistant mortar to seal the joints. Install a chimney cap to prevent water and debris from entering the chimney.

6. Finish the Base:

Pour concrete mix into the foundation trench around the fireplace base. Smooth the concrete and allow it to cure according to the manufacturer's instructions.

7. Add Decorative Touches:

Once the concrete is cured, you can add decorative touches to your fireplace, such as staining or painting the cinder blocks, adding a stone veneer, or installing a mantel.

Tips for Success:

Use a level and a straightedge to ensure that your fireplace is level and square throughout the building process.
Wear proper safety gear, including gloves, safety glasses, and a dust mask, when working with cinder blocks and concrete.
Allow ample time for the concrete mix to cure before using the fireplace.
Never burn wood or other combustible materials directly on the cinder blocks. Use the fireplace grate to protect the firebox.