7
minimum distances shown in Table 2 and Figure 2
are met.
O. Install the hearth and or hearth extension. En-
sure the Table 2 and Figure 3 clearances and distanc-
es are maintained. Ensure that the hearth and
flooring under and in front of the hearth are made of
fully non-combustible materials, not just a non-
combustible floor covering. When the hearth instal-
lation is complete, you are now ready to install the
exterior.
3.3 Exterior finishing
The exterior finish of an indoor fireplace will vary as
compared to an outdoor application and may be lim-
ited depending on location in the home and framing
that encompasses the fireplace. Mantle and exterior
veneers may be fabricated stone, thin veneer or full
bed depth natural stone, tile, brick or stucco.
If the exterior finish is going to be stucco, stain, tile or
manufactured thin stone wrap outside of firebox with
metal lathe. Attach metal lathe to firebox using con-
crete nails, tapcons, masonry or concrete anchors.
Natural stone, full bed depth or thin veneer, full size
brick, concrete pavers, CMU block, etc. do not require
metal lathe.
Ensure same refractory mortar is used.
4.0 Installation of Chimney
Either one of two types of chimney may be installed,
the Stone Age masonry chimney system consisting, of
proprietary outer blocks and clay flues, or metal pipe
chimney pipe tested and certified to UL 103 standards
for the US and ULC S604 standards for Canada.
4.1 Stone Age Masonry System
The Stone Age Masonry chimney system consists of
stacking Stone Age chimney blocks and installing a
clay flue inside.
A. Place a clay flue inside the chimney block. The
holes in each corner of the chimney block allow the
placement of rebar and mortar for additional rein-
forcement, if desired.
B. Continue with stacking the outer blocks and clay
flues until the desired height is reached. Mortar the
flue sections together, and mortar the chimney block
sections together. There will be dead air space be-
tween the flue and chimney block sections. See Fig-
ure 19.
C. The chimney is completed by stacking as many
flue sections as necessary to reach chimney height.
Chimney plumbing can either be straight through the
ceiling and through the roof, or if the fireplace is in-
stalled on an outside wall, the chimney can be external
to the house. When needed offset blocks can be used
for the chimney and should be engineered to structur-
ally support the offset with CMU or custom fabricated
steel post and or angle iron capable of supporting the
weight and height of the chimney. Never exceed
more than a 30 degree angle when offsetting a chim-
ney. See Figure 20.
D. Masonry chimneys taller than 24 feet should be
tied into the surrounding structure for additional sup-
port, due to the weight of the flue system. Consult
Offset
Blocks
CMU
Figure 20. Offset Blocks and CMU Support
Figure 19. Masonry Chimney Assembly
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