42
42
Firebrick Installation
Expansion
1/2” Gap
Expansion
1/2” Gap
Fire Brick Floor
(Built First)
Fire Brick Floor
and Back Wall
(Built First)
FIGURE 42
FIGURE 43
FIGURE 44
The expansion joint in this illustration
is on the hearth.
The expansion joint in this illustration is
on the backwall.
Earthcore Industries
MAGNUM Series Fireplace
The manufacturer requires for the MAGNUM model
fireboxes be lined with a minimum 2-1/2” thick firebrick
for the Floor and Backwall and four inch (4") firebrick on
the sidewalls.
Thicker firebrick may be used as an option.
The pattern for the firebrick lining is an owner option. The
ISOSET mortar by Earthcore is to be used when lining the
Isokern Fireplace.
The ISOSET Firebrick Mortar Application:
• Add .75 quarts of water per 10lbs of dry product until
completely blended.
• Only mix what can be utilized within 15 minutes
• Do not retemper (the addition of water after the
chemical reaction has begun).
• The use of warm water will accelerate setup
• Joint thickness should be thin (1/4”- 3/8”)
• Complete set time is between 48 & 72 hours.
• For best results, please allow 28 days before heat is
applied.
• Approximately 35 to 40 lbs of prepared mortar will
lay up one hundred 9 x 41/2 x 21/2” Straights.
•
DO NOT
add additives such as fireclay, sand,
cement, or other accelerators.
These instructions may vary because of different
climates and conditions. The use of good masonry
practices for your area should also be considered.
Installation Instructions:
1.
Wet mop the inside of the fireplace with a damp sponge
to remove dust and loose particles from the interior before
installing firebrick. Keep the fireplace damp while installing
firebrick.
For Best Results:
1. After wet sponged interior of firebox apply a 1/4
notch bed joint on rear sides and floor.
2. Dip each firebrick in a pale of water before applying
mortar to one side for adherence to firebox.
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 firebrick.
3.
Start the firebrick at the front edge of the floor of the
Isokern firebox, proceeding inward toward the back. Let
the floor brick gap approximately 1/2” off the back wall
and side walls. This air space allows heat expansion of the
firebrick and is to be left empty of mortar.
(Figure 42)
4.
Next, apply firebrick to the back wall of the unit. The back
wall firebrick covers the 1/2” expansion gap left at the brick
floor along the back wall of the firebox.
(Figure 43)
5.
Set the side wall firebrick by starting at the front edge
of the unit’s side wall and working inward toward the back
wall firebrick. The side wall firebrick, when completed,
covers the 1/2” expansion gaps where both the floor
firebrick and the back wall firebrick were held off the units
side walls.
(Figure 44)
All required through-wall accesses (gas and air intake
supply access holes) should be drilled before the required
firebrick lining is installed. Do not cover these areas with
firebrick.
Earthcore makes no claims as to the performance of
firebrick or firebrick mortar(s). It is typical for heat stress
cracks to appear in the firebrick in fireplaces.
