How To Build An Outdoor Fireplace Out Of Cinder Block

How to Construct an Outdoor Fireplace Using Cinder Blocks

Building an outdoor fireplace out of cinder blocks is a fantastic DIY project that can greatly improve your outdoor living area. With a little planning and effort, you can create a stunning and functional fireplace that will provide warmth, ambiance, and a place to gather with friends and family.

Here is a step-by-step guide on how to build an outdoor fireplace out of cinder blocks:

Materials

Cinder blocks
Mortar mix
Water
Rebar
Fire grate
Firebricks
Chimney cap
Chimney liner
Gravel
Sand

Tools

Shovel
Trowel
Level
Hammer
Chisel
Measuring tape
Circular saw
Safety glasses
Gloves

Instructions

1. Plan and Design

Before you begin, take some time to plan the design of your fireplace. Decide on the size, shape, and location. It is also important to consider the direction of the prevailing wind so that the smoke will not blow into your seating area.

2. Prepare the Foundation

Excavate a hole for the foundation that is at least 12 inches deep and 2 feet wider than the planned fireplace. Fill the hole with gravel and tamp it down firmly. This will provide a stable base for the fireplace.

3. Lay the First Course

Start laying the first course of cinder blocks on the prepared foundation. Use a level to ensure that the blocks are level. Stagger the joints between the blocks to create a stronger structure.

4. Reinforce the Walls

As you build up the walls, be sure to reinforce them with rebar. Place the rebar every few courses and bend it around the corners to create a strong framework.

5. Create the Firebox

Line the inside of the fireplace with firebricks. The firebricks will protect the cinder blocks from the heat of the fire. Install a fire grate at the bottom of the firebox to support the firewood.

6. Build the Chimney

Continue building up the walls until you reach the desired height of the chimney. Install a chimney liner inside the chimney to prevent sparks and smoke from escaping. Top the chimney with a chimney cap to keep out rain and animals.

7. Finish the Fireplace

Once the fireplace is complete, you can add any finishing touches you desire. You could paint the exterior of the fireplace, add a mantel, or install lighting.

Enjoy Your New Fireplace

Congratulations! You have now built an outdoor fireplace out of cinder blocks. Enjoy the warmth and ambiance of your new fireplace with friends and family for many years to come.

Tips

Use a mix of 1 part cement to 3 parts sand to 1 part lime for the mortar mix.
Wet the cinder blocks before laying them to improve the bond with the mortar.
Allow the mortar to dry for at least 24 hours before using the fireplace.
Never burn trash or other materials in your outdoor fireplace. This can damage the fireplace and release harmful pollutants.