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firerock solid block chimney

FireRock Systems Solid Block Chimney

FireRock’s patented one-piece interlocking components make it easy to add an all-masonry chimney to your fireplace. Approved for indoor and outdoor fireplaces, these nesting blocks may be stacked as high as building code allows. Use FireRock’s Bricking Flange in conjunction with the Solid Block Chimney to add a brick, stone, or stucco veneer above the roof. This Solid Block Chimney is required if our plans call for a Bricking Flange.

Installation Notes:

  • No flue liner necessary.
  • To increase strength, insert rebar and mortar into the “hurricane” holes.
  • UL 127 compliant for “zero clearance” to combustibles
  • Independently tested at 3,000 PSI compressive strength
  • Pieces maybe stacked as high as code allows


  • Each piece is 6″ tall
  • 15″ diameter flue, largest round masonry flue in the industry

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Instruction Manual

Spanish Instruction Manual

UL 127 compliant