12. Attaching the Chimney
Overview
Your chimney may be constructed with various methods,
including Simpson DuraTech Chimney System (UL103HT),
refractory chimney flue liner, a classical brick and mortar
chimney, or a single wall steel chimney pipe.
Specifying building code and regulations is beyond the
scope of these plans, as they differ among states, cities and
local departments. Still, we want to emphasize that you
should contact your local building department to determine
your local building codes, and take care to follow them.
Wood-fired ovens are a source of heat and flame, and you
should consult local professionals when building your oven.
The following table outlines the internal diameter of the
chimney using a round, steel chimney system for different
oven sizes:
Oven Size
Chimney Diameter
32" - 36"
6" (internal)
40"+
8" (internal)
ASTM 1283 (Standard Practice for Installing
Clay Flue Lining):
Flue liners shall be surrounded by masonry on all sides but
shall not be bonded to the surrounding masonry. The flue
liner shall contact the chimney wall only as necessary for
support and alignment in order to permit the flue liner to
expand and contract freely. The separation of the flue liner
from the surrounding concrete or masonry shall not exceed
the wall thickness of the flue liner. Where Seismic
Reinforcing requires the space between the flue liner and
the chimney wall to be grouted solid the flue shall be
wrapped with ceramic fiber paper capable of withstanding
temperatures of 2100 deg. F to prevent the flue liner from
bonding to the chimney walls.
Flue liners should conform to ASTM C 315 (Standard
Specification for Clay Flue Liners). They should be
thoroughly inspected just prior to installation for cracks or
other damage. Steel should be ASTM-A 36 (max of: 0.26%
Carbon, 0.04% Phosphorus, 0.05% Sulfur).
12.1. Refractory flue liner.
UL103HT
According to its installation guide, “The Simpson DuraTech
system has been approved for use with solid fuel
appliances, including wood stoves, fireplaces, fireboxes,
furnaces, water heaters, stoves, ranges, and other
residential types appliances using gas, coal or wood,
according to UL103HT. The system specifies a clearance of
at least 2” between the DuraTech chimney system and any
combustible materials, and a height of 3” above the roof,
and 2” above any roof within 10’.”
Pompeii Oven Instructions
© Forno Bravo, LLC 2007-2009. All Rights Served.
Ver. 2.0
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