21
FIREPLACE INSTALLATION
STEP 2: MIXING AND APPLYING MORTAR
FIREROCK ADHESIVE MORTAR
FireRock Adhesive Mortar must be used when building the
FireRock fireplace for your FireRock warranty to be valid.
Use of other mortar will void your FireRock warranty
This mortar is available from your FireRock dealer or
distributor. This specially formulated mortar is a low
sand polymer modified with heat resistant additives and
is designed to work as a “glue” rather than a typical joint
provider.
MIXING THE MORTAR
Mix FireRock Adhesive Mortar with clean water
according to the instructions on the bag until it results in
a “toothpaste” consistency, free of lumps or dry pockets.
Be sure it is not too thin or runny to ensure maximum
strength. Use only clean water when mixing FireRock
Adhesive Mortar. Do not use spirits or anti-freeze agents.
Do not apply if temperatures are below 40 °F or will be
within a 24 hour period.
APPLYING THE MORTAR
It is appropriate to use a trowel or grout bag to apply the
mortar to firebox and smoke chamber joints. These joints
should be
COMPLETELY COVERED BY 1/2” - 1” OF
MORTAR
(Figure 5.1) and the components stacked so
as to result in a 1/16” to 1/8” joint. The excess mortar should
push (ooze) out and be scraped away.
BUTTERING THE JOINTS
At each level of the firebox, smoke chamber, and masonry
chimney it is important to go back and “butter” all joints.
This procedure involves a final smoothing of any excess
mortar, inside and out, sealing all joints and ensuring a “no-
leak” installation (Figure 5.2).
FIGURE 5.1
SIDE BLOCK WITH MORTAR APPLIED TO TOP FACE
FIGURE 5.2
FIREBOX WITH BUTTERED JOINTS
Содержание FIREROCK LINEAR
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