Isokern Standard 36 - Firebrick Installation

Expansion
1/2” Gap
Expansion
1/2” Gap
Fire Brick Floor
(Built First)
No Gaps
Fire Brick Floor
and Back Wall
(Built First)
20
Fire Brick Installation
Fire Brick Installation:
The manufacturer requires that the replace reboxes
be lined with a minimum one and one-eighth (1-1/8”) thick
re brick. Thicker re brick may be used as an option. The
pattern for the re brick lining is an owner option. Standard N
or S type brick mortar is suitable mortar for the replace.
Fire brick mortar needs to be suitable to both adhere
the re brick to the inside of the rebox and to create the
nished face joints of the brick work. Based on a history of
eld applications and experience, a suitable mortar would be
as follows:
Mix:
* 1 bucket masonry mortar (S or N type)
* 5 lbs Earthcore mortar
* Six parts sand (1 1/2 bucket)
* One part Fire Clay (optional)
* Water to a sticky, toothpaste consistancy
These instructions may vary because of different
climates and conditions. The use of good masonry practices
for your area should also be considered. It takes about 25 lbs.
of mortar mix (dry measure) to re brick line a replace.
Installation Instructions:
1. Wet mop the inside of the replace with a damp
sponge to remove dust and loose particles from the interior
before re-bricking.
HINT: Dip each rebrick into water before applying.
2. Face joint dimensions of 1/4” to 3/8” in the brick
work is recommended and has the best appearance. Other face
joint dimensions are acceptable however smaller joints may
not leave room for heat expansion of re brick.
3. Start the re brick at the front edge of the oor
of the Isokern rebox, proceeding inward toward the back.
Let the oor brick gap approximately 1/2” off the back wall
and side walls. This air space allows heat expansion of the re
brick and is to be left empty of mortar. (Figure 23)
4. Next, apply re brick to the back wall of the unit.
The back wall re brick covers the 1/2” expansion gap left at
the brick oor along the back wall of the rebox. (Figure 25)
5. Set the side wall re brick by starting at the front edge of
the unit’s side wall and working inward toward the back wall
re brick. The side wall re brick, when completed, covers
the 1/2” expansion gaps where both the oor re brick and the
back wall re brick were held off the units side walls. (Figure
24)
All required through-wall accesses (gas and electrical
line feeds and combustion air supply access holes) should be
drilled before the required re brick lining is installed.
Earthcore makes no claims as to the performance
of re brick or re brick mortar(s). It is typical for heat stress
cracks to appear in the re brick in replaces.
FIGURE 23
FIGURE 24
FIGURE 25