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LIGHTWEIGHT BLOCK-IN INSTALLATION (Cont.)
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 52" Piece
of 26 Gauge
Galvanized Tin
Vapor Barrier
SIDE VIEW OF FIREPLACE ENCLOSURE
36"
29 1/2" Minus Thickness of Facing
26 Gauge Galvanized Tin Vapor Barrier
2 by 4 Guide
BACK WALL OF CHASE
52"
Page 25
Back
Wall of
Chase
29 1/2"
Minus
Thicknes
of Facing
Material
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