How To Build An Outdoor Stone Fireplace And Chimney

How to Build an Outdoor Stone Fireplace and Chimney

Building an outdoor stone fireplace and chimney is a rewarding project that can add beauty, warmth, and ambiance to your backyard. While it may seem like a daunting task, it is manageable with the right planning and materials. This guide will provide you with step-by-step instructions on how to build an outdoor stone fireplace and chimney, ensuring that you create a safe and functional centerpiece for your outdoor living space.

Materials you will need:

Natural stone or manufactured stone veneer
Firebricks
Mortar
Gravel
Concrete blocks
Fireplace damper
Chimney cap
Chimney flue
Tools required:
Level
Shovel
Masonry saw
Trowel
Grinder
Safety glasses
Gloves

Step 1: Plan and Prepare the Site

Choose a suitable location for your fireplace, ensuring it is away from any flammable materials or overhanging trees. Mark the perimeter of the fireplace and chimney using stakes and string. Excavate the area to a depth of 12 inches and fill it with gravel for drainage. Compact the gravel thoroughly.

Step 2: Build the Foundation

Lay a foundation of concrete blocks or poured concrete. The foundation should be larger than the fireplace and chimney and extend at least 6 inches below the ground.

Step 3: Build the Fireplace Base

Start by laying a row of stones around the perimeter of the fireplace. Use a level to ensure the stones are flat and level. Use mortar to secure the stones in place. Continue laying rows of stones, overlapping them slightly and staggering the joints. Cut stones with a masonry saw or grinder as needed.

Step 4: Build the Firebox

Line the interior of the fireplace with firebricks. Lay the firebricks in a herringbone pattern, using mortar to secure them. Extend the firebox up to the desired height, typically 24-36 inches.

Step 5: Build the Chimney Base

Build the chimney base using stones or concrete blocks. Ensure the base is square or rectangular and aligns with the fireplace opening. Extend the chimney base to a height of about 3 feet.

Step 6: Install the Chimney Flue and Damper

Place the chimney flue inside the chimney base and secure it with mortar. Install the fireplace damper on the top of the flue. This damper will help control the airflow and prevent smoke from entering the room.

Step 7: Build the Chimney Shaft

Continue building the chimney shaft using stones or concrete blocks. Stagger the joints and use mortar to secure the stones. Leave a 1-inch gap between the chimney shaft and the flue for proper airflow.

Step 8: Install the Chimney Cap

Place the chimney cap on top of the chimney shaft. Ensure the cap fits snugly and prevents water from entering the chimney.

Step 9: Finishing Touches

Point the mortar joints with a trowel and smooth them out. Remove any excess mortar and clean the stones. Allow the fireplace and chimney to cure for several days before using it.

Tips:

Use a level throughout the construction process to ensure everything is straight and level.
Lay the stones tightly together to minimize gaps and prevent drafts.
Wear safety glasses and gloves when working with stone and mortar.
Allow ample time for the mortar to cure before using the fireplace.
Inspect the fireplace and chimney regularly for any cracks or damage and repair them promptly.

Building an outdoor stone fireplace and chimney requires careful planning and execution. By following these step-by-step instructions and using the right materials, you can create a stunning and functional centerpiece that will enhance your outdoor living space.