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LIGHTWEIGHT BLOCK-IN INSTALLATION (Cont.)
Place the block on top of the mesh as shown in the illustration below. It is not necessary to
mortar to the mesh unless required by local building codes. Make sure to line the blocks up
against the 2 x 4 guide, working towards the back. There should be a 2" gap between the
back wall of the chase and the back row of blocks. The back row of blocks must be cut to the
appropriate length to fit correctly and adhere to the specifications. This is the first course of
blocks.
4 x 8 x 16 Block
(3 1/2" x 7 1/2" x 15 1/2")
If the hearth extension height is to be 11" or less, place the supports for the fireplace as
shown in the illustration below. For hearth extensions greater than 11" add shims of non-
combustible material or brick until the desired height is reached.
(Minimum Height for
1st Course of Blocks)
7 1/2"
11"
(Minimum
Allowable)
3 1/2"
BACK WALL OF CHASE
NOTE: If bottom air is to be used
be sure to cut hole through block
during this step.
48" Min.
52 1/2" Max.
2 by 4 Guide
41"
Page 26
NOTE: The back row of block
must be cut to the appropriate
length to fit correctly.
BACK WALL OF CHASE
Place as necessary
to support fireplace.
3 1/2"
(Minimum
Height for
7 1/2"
1st Course
of Blocks)
2"
Mesh Screen
Under Block
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