4
Footing requirements for indoor installations should
be determined based on local building code. Consult
with a structural engineer to determine the footing re-
quirements based on the overall height, and the weight
of fireplace, chimney, and finish materials. If custom
hearths or additional masonry structure is to be at-
tached to the fireplace kit, the footing dimensions
should be adjusted to include these customizations.
Use Stone Age’s Multi-Purpose Ready-Mix, or anoth-
er high temperature fire clay or refractory cement suit-
able for indoor or outdoor use, and mix according to
manufacturer’s instructions.
Once the fireplace is constructed you must wait at least
28 days before building a fire to give adequate time to
cure. This will provide ample time for any water resi-
due to evaporate, eliminating the adverse reaction of
the combination of water and fire.
Stone Age products are designed to be assembled us-
ing a 3/8” fully bedded mortar joint for the kit pieces.
Do not “butter the edges” of the kit pieces. All kit
pieces should be assembled in this manner. It is ac-
ceptable to vary the joint thickness, if a thicker or
thinner joint is needed to allow pieces to fit properly in
the field.
If the unit is to be installed indoors, do not use the Ris-
er Legs (items 1 and 1A, shown in Figure 2 and Table
1). Instead, install the fireplace on a solid base, such
as a cement pad or concrete blocks. Two courses of 8”
tall block will be slightly shorter than the riser legs of
the kit.
3.2 Assembly of Components
Components that become broken during shipment and
handling can be mortared back together providing the
breaks or cracks are clean and the original alignment
can be maintained. Components broken into multiple
pieces must be replaced.
If this is your first Stone Age installation, it is suggest-
ed that you first assemble the components without
mortar to familiarize yourself with how the compo-
nents fit together. See Figure 2.
During the actual assembly with mortar, ensure each
layer of the kit is plumb, level, and square before pro-
ceeding to the next step of the assembly.
A. Determine if the unit will be built with its floor
raised above the surrounding floor, or at the same
level. This fireplace oven combo is tall enough that
in most cases, it may be preferable to set the fireplace
floor directly on the pad or footing, without raising it
as you typically would with a single fireplace with-
out an oven above it. If raising the fireplace, deter-
mine the height above the floor you want to place the
base plate (2), while considering the floor height of
the oven above. The base plate, plus firebrick, will
be approximately 4 1/2 inches thick. Mortar and set
concrete blocks into place to reach the desired
height. Ensure the block base is level and square.
Set the base plate (2), ensuring it is level and square.
See Figures 5 & 6.
1
Base Plate
Concrete Block
Base
Figure 5. Block Base
Figure 6. Kit Base Plate on
Block Base
Figure 4. Footing with Piers
A
B
C
Front
