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Firebrick & Mortar

Make your fireplace your own with firebrick from FireRock - available in 4 different colors and 3 different sizes.

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FireRock firebrick complies with ASTM standards C1261 and C27 and meets the requirements of local, national and international building codes regarding fireplace and chimney construction and the National Fire Protection Association NFPA-211. A compliant firebrick lining is a minimum 1¼” thick on all sides. FireRock recommends using 2½” thick firebrick to line the floor and back wall. Note: all firebrick sizes are nominal. 





Black (Glazed)

Black (Unglazed)
Available by the full cube only

Slate Gray (Glazed)

Popular Patterns

Running Bond

Stacked Bond

Basket Weave

Full Herringbone

Split Herringbone

FireRock Adhesive Mortar

Mortar BagsFireRock Adhesive Mortar is a specially formulated mortar - a low sand polymer modified with heat resistant additives - and is designed to work as a “glue” rather than a typical joint provider. This mortar must be used to install the firebox in order for the FireRock warranty to be valid. It may also be used to install the firebrick, though substitutions are allowed. Substitutions in the firebox will result in a non-compliant unit and will invalidate the FireRock warranty.

  • Weight per bag: 25 lbs
  • Bags per pallet: 96 bags
  • The appropriate number of bags for each fireplace are included with the installation kit
  • Mortar for masonry chimney block must be purchased separately
  • One bag of mortar is needed for every 6 masonry chimney pieces

How to Use Our Mortar


Mix FireRock Adhesive Mortar with clean water according to the instructions on the bag until it results in a “toothpaste” consistency, free of lumps or dry pockets. Be sure it is not too thin or runny to ensure maximum strength. Use only clean water when mixing FireRock Adhesive Mortar. Do not use spirits or anti-freeze agents. Do not apply if temperatures are below 40 °F or will be within a 24 hour period.


Applying Mortar

  • It is appropriate to use a trowel or grout bag to apply the mortar to firebox and smoke chamber joints.
  • Joints should be completely covered by 1/2” - 1” of mortar and the components stacked so as to result in a 1/16” to 1/8” joint.
  • Excess mortar should push (ooze) out and be scraped away.
  • Under normal conditions assembly is cured in 24 to 48 hours.
  • FireRock Adhesive Mortar must be used when building the FireRock fireplace for your FireRock warranty to be valid.


Buttering the Joints

At each level of the firebox, smoke chamber, and masonry chimney it is important to go back and “butter” all joints. This procedure involves a final smoothing of any excess mortar, inside and out, sealing all joints and ensuring a “no-leak” installation.

Not sure what direction you want to take with your next project? Contact us to learn from our experts.

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