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LIGHTWEIGHT BLOCK-IN INSTALLATION (Cont.)
Continue with mortaring each course of block staggering the joints until the top of the
fireplace is reached (See illustration below). Be sure to keep the front of the enclosure level
with the faceplate of the fireplace when aligning each course of block. When installing each
new course of block, make sure to add enough mortar to make the block-in obtain a height
that will be just taller than the fireplace when the fifth course is installed (i.e. if not enough
mortar is added between vertical joints, the sixth course will be lower than the fireplace
height, making a seventh course necessary in which each block will have to be cut to get to
the required height).
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