6" Firerock Chimney Block

6" Firerock Chimney Block

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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. 

Independently tested at 3,000 PSI compressive strength. To increase the chimney's strength even more, insert rebar and mortar into the "hurricane" holes.



  • Dimensions: 22" (W) x 22" (L) x 6" (H)
  • 15″ diameter flue
  • Weight: 75 lbs
  • No flue liner necessary
  • UL 127 compliant
  • 0" clearance
  • Use with FireRock’s Brick Flange to add a brick, stone, or stucco veneer above the roofline
  • 1 bag of FireRock mortar needed for every 6 masonry chimney blocks 

Important: Please consult local building codes for specifics regarding any masonry fireplace application.