BASE PLATE
ECI
MORTAR
FIRST COURSE
SIDE WALL
ECI
MORTAR
15
Assembly Instructions - (cont.)
3. Earthcore mortar can be troweled over the face of a joint
where it has squeezed out while setting components. It is not
intended that the exposed faces of the Isokern components be
completely covered with the mortar.
Installation:
Step 1: Set the MAGNUM base plate in a full bed of Earthcore
Mortar at on a proper concrete support foundation. (Figure 9).
Do not set the MAGNUM base plate so that it is in span. Level
the MAGNUM base plate by oating it in a bed of Earthcore
Mortar to full bearing against the underlying noncombustible
support surface.
Notes: If the design preference is for a “ush hearth” (replace
oor ush with the room’s oor), the base plate can be omitted
from the assembly and the rebox walls built directly on the
concrete support slab. The re brick oor of the rebox is then
set directly to the concrete support slab. This makes the replace
nished re brick oor approximately one and one-half inches
(1-1/2”) above the top of the concrete support slab (Figure 10).
If the design preference is for a raised hearth (oor of
the replace elevated above the room’s oor), then the MAG-
NUM base plate can be set on a noncombustible platform that
is built up to the desired raised hearth height on the concrete
support slab.
When calculating raised hearth height be sure to allow
for the three inch (3”) thick base plate plus the one and one half
inch (1-1/2”) thick re brick oor in addition to the height of the
platform. Whether a ush hearth is preferred or a raised hearth,
the combustible oor on front of the replace must be covered
with a noncombustible hearth extension set tight against the re-
place front and extending at least 20 inches out from the nished
replace and at least 12 inches beyond the nished sides of the
replace opening. (Figure 11)
For all “raised hearth” construction where concrete
blocks are used to create the raised platform, it is necessary to
use the MAGNUM base plate. Be sure to mortar the concrete
block platform together. CMU used for base plate support
should be rated ASTM 90.
Step 2: Set the rst course of the rebox back wall and side
walls into place.
It may be convenient to dry set the rst course of side
wall and back wall into place on the Isokern base plate and then
to trace their position on the base plate with a pencil. (Figure 12)
After outlining the dry set pieces, remove them and ap-
ply Earthcore Mortar to the areas traced on the base plate where
the side walls and back wall are to sit. By doing this, the rst
layer of Wall components can be set directly into mortar already
applied to the proper areas on the base plate. (Figure 12)
Be sure to put Earthcore Mortar on the contact surfaces
of the vertical joints where the side wall and back wall compo-
nents connect. (Figure 13)
Note: At all component placement, be sure to mortar all compo-
nent contact surfaces with Earthcore Mortar. Check for complete
sealing of each contact joint while assembly progresses.
FIGURE 12
FIGURE 9
FIGURE 11
FIGURE 10
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