51
Earthcore Industries
MAGNUM Series Fireplace
51
Firebrick Installation
Expansion
1/2” Gap
Expansion
1/2” Gap
Fire Brick Floor
(Built First)
Fire Brick Floor
and Back Wall
(Built First)
FIGURE 64
FIGURE 65
FIGURE 66
The expansion
joint in this
illustration
is on the
hearth.
The expansion
joint in this
illustration is on
the backwall.
The manufacturer requires for the 28, 36, 42, and 48 model fireboxes be
lined with a minimum 1 1/8”-thick firebrick. 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 10 lbs 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 and 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 4½" x 2½” 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 3/8" 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 1/16” to 1/8” 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 backwall and side walls. This air space allows heat expansion of
the firebrick and is to be left empty of mortar
(Figure 64)
.
4.
Next, apply firebrick to the back wall of the unit. The backwall firebrick
covers the 1/2” expansion gap left at the brick floor along the backwall of the
firebox
(Figure 65)
.
5.
Set the side wall firebrick by starting at the front edge of the unit’s side
wall and working inward toward the backwall firebrick. The side wall firebrick,
when completed, covers the 1/2” expansion gaps where both the floor
firebrick and the backwall firebrick were held off the unit's side walls
(Figure 66)
.
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.
