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B
LOCK
P
16
AGE
Block-In Installation
This section is a step-by-step overview on how to construct a block-in installation. It is for
review only and is not the only method of installation. Make sure all requirements listed in this
manual are met. Carefully plan the installation prior to starting.
1) Laying the Vapor Barrier
The vapor barrier must be made of a minimum 26 gauge galvanized tin, 36" wide by 46" long.
Nail the vapor barrier to the floor in the location where the block-in will rest. The vapor barrier
will extend beyond the block-in in front and in back. These portions should not be removed
because they provide protection against heat and act as an ember protector between hearth
extension and block-in. They can be covered with non-combustible tile, brick, or stone if
desired. NOTE: Vapor barrier is not necessary for non-combustible floors.
2) Making a Guide for the Brick
Measure 29 1/2" from the back wall of the chase and subtract the thickness of the facing material
to be used (for thin facings such as marble or tile include the 1/2" thickness of the cement fiber
board used as a backing). If facing material is to butt to the edge of the faceplate (inside fit),
subtract 1/4" to 3/8" from the combined thickness of the facing material and then subtract that
total from the 29 1/2". Nail a 2 x 4 approximately 4' long across the opening at the specified
distance from the back wall of the chase. This 2 x 4 will be used as a guide for the first course of
block. See the illustration on the following page.
2 by 4
(5' Long)
Cut a piece of mesh screen used by masons to fit over the vapor barrier behind the 2 x 4 guide.
Nail it as necessary to the top of the vapor barrier. This keeps the blocks from sliding (See the
illustration below).
Mesh Screen used for Masonry
36" x 46" Piece
of 26 Gauge
Galvanized Tin
Vapor Barrier
-I
I
N
NSTALLATION
SIDE VIEW OF FIREPLACE ENCLOSURE
29 1/2" Minus Thickness of Facing
26 Gauge Galvanized Tin Vapor Barrier
2 by 4 Guide
(C
)
ONTINUED
36"
BACK WALL OF CHASE
46"
Back
Wall of
Chase
29 1/2"
Minus
Thicknes
of Facing
Material
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