4
installed is a solid and level foundation and is com-
posed of non-combustible material, such as con-
crete.
Select a high temperature fire clay or refractory
cement and mix according to manufacturer’s in-
structions. Several companies in the U.S. and Can-
ada sell refractory cement or fire clay including
Stone Age Manufacturing.
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 residue to evaporate, eliminating the adverse
reaction of the combination of water and fire.
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 sug-
gested that you first assemble the components
without mortar to familiarize yourself with how the
components fit together. See Figure 1.
A. Determine the height off the floor you want to
place the base plate (1). The base plate, plus fire-
brick, will be about 5 ½ inches thick. Set cement
blocks under the base plate to obtain the desired
height.
B. When the base is level and square, set the
baseplate (1). Level it from side to side and front
to back.
C. As shown in Figure 2, install the sidewall
pieces (2) and the back plates (3 and 4). Use
3/8
”
of mortar joint between each section. Smooth out
mortar and make sure sections remain level.
D. Lay a straightedge across the left and right
sidewall to make sure level is maintained.
E. Install the slanted sides (6 and 7), and the back
header (5). Check the sides and the top with a lev-
el.
F. After installation of the back header (5), in-
stall the firebrick inside the firebox. Cover the
floor first with 1/8-inch high temperature cement.
On the sides, stand the brick on its sides and leave
a half inch space between the firebrick and fire-
place walls. Make a 1/8-inch mortar joint. Stack
brick until it is flush with the tops of pieces 5, 6
and 7. See Figure 4.
Figure 4. Install Firebrick
G. After fire brick installation is complete, install
the front header (8).
H. Install the cast iron damper. See Figure 5.
Attach poker handle through damper to damper
door. Set damper on top of firebox with handle
facing toward front of the fireplace. The bottom
lip of the damper should rest on the firebrick with
the front lip resting on the front header (8). Mor-
tar damper in place. Make sure the damper opens
and closes properly.
Figure 5. Install Damper
I. Install the first complete ring of four inter-
locking throat components (items 9, 10, 11 and
12). Check with a level.
J. Install second ring of four throat components
(Items 13, 14 15 16). Check with a level.
K. Install the first smaller ring of throat compo-
nents, consisting of items 17, 18, 19 and 20. Make
sure the ring is centered.
L. Install the smaller ring halves, items 21 and 22.
