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Install a Modular Outdoor Fireplace

More in Outdoors

Install an Outdoor Fireplace

Highlights:

Watch an Overview Video

Tools & Materials

Reinforced concrete or structurally engineered foundation
Concrete block
Masonry mortar
Trowel
¼-inch knotch trowel
Modular fireplace and chimney
Manufacturer’s mortar
Firebrick at least 1 1/8 inch thick
Firebrick mortar
Bucket
Water
Sponge
Stone, brick, plaster, or stucco cladding
Lathe
Scratch coat

Tips for Building a Modular Fireplace

TIP: Build a modular fireplace to extend your outdoor living space into cooler weather.

1. Build it on reinforced concrete or structurally engineered foundation.

2. For raised hearth, build base of concrete block.

TIP: Raised hearth can double as bench.

3. Assemble modular firebox and chimney on top of hearth, gluing together components with manufacturer’s mortar.

TIP: Components fit together like a puzzle; each one goes into only one place.

4. Scratch coat interior with ¼-inch knotch trowel.

5. Line firebox with firebrick at least 1 1/8 inch thick; use firebrick or refractory mortar.

TIP: To make firebrick adhere better, sponge down firebox and dip brick into water just before mortaring.

TIP: Keep application ¼ in thick or less so mortar won’t shrink in heat.

6. Finish exterior with plaster, brick, stone, or stucco.

TIP: Apply lathe and scratch coat first.

7. Start with small fires to cure mortar and reduce moisture in units.

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