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Block-In
¥
This fireplace requires a masonry block-in to surround the fireplace and act as a thermal barrier. It
must be made of lightweight concrete blocks.. It must be a minimum of 3 1/2" thick on all sides and
extend over the top of the fireplace with a minimum of 7 1/2" of masonry. It must have a 1"
clearance around the fireplace. Insulation is to be placed in this space wherever there is a possibility
that mortar or masonry could come in contact with the fireplace. Contact of the fireplace to the
masonry could cause the masonry to crack when the fireplace expands with heat. The block-in must
not have a clearance over 1" between the top of the fireplace and the top masonry enclosing it. The
top of the block-in must be at least 7 1/2" thick. Underneath the block-in there must be a 36" by 46"
piece of 26 gauge galvanized tin vapor barrier and mesh screen for holding the blocks in place. The
block-in must be a minimum of 42" wide and have a depth of 27 1/2" including the depth of the
facing. The block-in must be at least two inches away from the back and side walls of the chase.
17 1/2"
Min.
7 1/2"
Min.
1" Max.
11"
Min.
2" Min.
Mantel Requirements
¥
The optional mantel must be non-
combustible
¥
The mantel must be a minimum of 4" below
the header (a maximum 61" above the floor)
B
LOCK
Chimney Adapter
Header
4 1/2" Min.
-I
I
N
NSTALLATION
Header
Non-Combustible Mantle
(C
ONTINUED
Header must be at least
4" above mantle
Mantle (Optional) - Must Be
Non-Combustible
Last course of blocks
Second to last course
of blocks
4" Min.
)
P
7
AGE
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