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FIGURE 7A: MASONRY CHIMNEY INSTALLATION
The two longest pieces of angle iron are to be set on top of the block support walls as shown in
FIGURE 7A. The two shortest angle irons pieces are to span between the two long angle iron
pieces as shown in FIGURE 7A. Before installing these angle iron pieces, mortar should be spread
around the flue opening of the fireplace, extending four inches to the sides of the flue lip and a half-
inch higher than the masonry-supporting wall. Once the mortar has been applied to the proper
thickness, lay the two long angle irons across the supporting sidewalls so that they are embedded in
the mortar. The angle iron edges should butt up against the flue opening. The short angle irons
should now be installed so they bridge across the two long angle irons and be placed tight against
the flue lip. These short angle iron pieces should rest on the top inside face of the long pieces of
angle iron. If properly applied, mortar should embed the angle iron and form a good seal around
the angle iron.
FIGURE 7B: MASONRY CHIMNEY INSTALLATION
Version 7.1
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Lay one half inch of mortar on top of the angle irons around the flue and set the first section of the
clay flue tile on top of the angle irons. Now fill the space between the outside of the flue tile and
the vertical leg of the angle irons with mortar. Be certain that the mortar is level with the top edge
of all the angle iron. Now begin setting the four-inch brick or block on top of the mortar. Ensure