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LIGHTWEIGHT BLOCK-IN INSTALLATION (Cont.)
Mortar the first course of vertical block to the base along the sides and back maintaining a 1"
minimum clearance to the fireplace and a 2" minimum clearance to combustible wall.
When mortaring the vertically stacked courses of block that surround the fireplace, take into
consideration the total height that will need to be obtained to reach the height of the fireplace.
The last two courses of block act as a roof over the fireplace. If the vertically stacked blocks
do not obtain a height that is as high or higher than the fireplace, an additional course of cut
blocks will have to be used. To avoid having to use cut blocks, make sure to use enough
mortar between vertically stacked blocks to obtain the desired height. Measure each course
of vertically stacked blocks as they are being assembled to insure a proper height.
Remove the lifting handles on the sides of the fireplace and wrap the fireplace with the
insulation that is provided. This is to seal the fireplace to the masonry and provide an
expansion buffer to keep the fireplace from cracking the masonry when it heats up (See
illustration below).
Page 28
Insulation wrapped
around the fireplace.
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