How to Install Firebrick in a Fireplace

Fireplaces generally provide years of trouble-free use when given routine maintenance. The firebrick, also called refractory brick, is an important part of the fireplace construction. Firebrick lines the firebox of the fireplace and keeps the fire’s heat from damaging the materials in and around the fireplace. Firebrick can withstand temperatures up to 2200 degrees Fahrenheit. Packaged fireplace kits generally arrive with their own firebrick liner. If you are building a fireplace from the ground up, you will have to install the firebrick liner to fit the inner box yourself.

Firebrick
Heat-resistant mortar
Trowel
Tile or cutoff saw
Heavy gloves
Water
Sponge

Instructions

- 1
  Draw a line both horizontally and vertically along the firebox wall surface, coming together at a center point. You will begin to lay the firebrick along this center line and work outward toward the corners of the box. You can also lay firebricks in more elaborate herringbone patterns or other designs, if desired.
- 2
  “Butter” the face of each firebrick with a thin layer of heat-resistant mortar before setting it into place on the firebox wall. Leave a joint of at lease 1/16-inch between bricks.
- 3
  Continue laying whole fire bricks until you reach the wall or corner of the firebox.
- 4
  Measure and cut the firebricks to fit the size of the remaining length at the wall or corner. Install the partial brick according to previous steps.
- 5
  Repeat the steps on the other walls of the firebox. Many fireboxes have three walls, though some may have only two or even a single curved wall.
- 6
  Fill the spaces between the firebricks with heat-resistant mortar, removing excess from the surface with a trowel.
- 7
  Wash the remaining mortar off the firebrick with water and a clean sponge. Allow the mortar to dry thoroughly before using the fireplace.

Laminate Posts Vs. Solid Posts

PVC Hidden Decking Fastener Recommendation

Building Materials & Supplies