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LIGHTWEIGHT BLOCK-IN - SPECIFICATIONS (Cont.)
Block-In
The Fireplace Xtrordinair 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 52" 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 48" 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. See the
illustration below.
Header
17 1/2"
Min.
7 1/2"
Min.
1" Max.
Diagonal
Block
11"
Min.
2" Min.
Chimney Adapter
4 1/2" Min.
Page 13
Header must be at least
4" above mantle
Mantle (Optional) - Must Be
Non-Combustible
Last course of blocks
Second to last course
of blocks
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