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FIREPLACE INSTALLATION
STEP 7: CHIMNEY ASSEMBLY
SOLID BLOCK CHIMNEY
FireRock Solid Block Chimney (Figure 10.1) may be
installed from this point. Completely cover each chimney
block component with 1/2” - 1” of mortar, resulting in a 1/16”
- 1/8” joint. “Butter” all joints to give a smooth appearance
and ensure a leak-free joint. The inside face of the chimney
should also be “buttered” to ensure a no-leak seal, as well
as to prevent smoke obstruction caused by excess mortar
build up.
For masonry chimney, mortar should be used at a rate of 1
bag for every 6 blocks.
SOLID BLOCK CHIMNEY SPECIFICATIONS
• Overall width: 22” x 22”
• Overall height: 6”
• Weight: 75 lbs
• UL 127 compliant
• 0” clearance unless offset, then 1” clearance above
offset
To increase the solid block chimney’s strength even more,
insert rebar and mortar into the “hurricane” holes (see
Figure 10.1).
NOTE
: Solid Block Chimney is required if your plans call
for a Brick Flange (see page 30). Refer to local building
codes for minimum and maximum height requirements
REQUIRED CLEARANCES:
The FireRock Solid Block
Chimney system is listed for 0” clearance to normal
construction materials and may be enclosed in a wood
chimney chase at 0” clearance to wood framing members.
HURRICANE HOLES
FIGURE 10.1
SOLID BLOCK CHIMNEY
*If using a metal chimney, refer to page 34
FIGURE 10.2
72” LINEAR FIREPLACE WITH 4 CHIMNEY BLOCKS
