Solid Chimney Block

The easiest way to add an all-masonry chimney to a fireplace.

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A Strong, Patented Design

Chimney blocks are one-piece interlocking components that make it easy to add an all-masonry chimney to your indoor or outdoor fireplace. These nesting chimney blocks can be stacked as high as building code allows, and have been independently tested at a compressive strength of 3,000 PSI. To further increase the strength of our chimneys, rebar and mortar can be placed into the “hurricane” holes.

Product Specifications

  • Dimensions: 22” (W) x 22” (L) x 6” (H)
  • Flue: 15” diameter
  • Weight: 75lbs
  • 0” Clearance
  • 1” clearance required above an offset
  • UL 127-compliant
  • Use with FireRock’s brick flange to add brick, stone, or stucco veneer above the roofline
  • 1 bag of FireRock mortar is needed for every 6 masonry chimney blocks
*Please consult local building codes for specifics regarding any masonry fireplace application