31
Earthcore Industries
MAGNUM Series Fireplace
31
FIGURE 32
FIGURE 33
Lateral Support for DM Chimneys
Though not required, it is recommended that where the
DM chimney is built up along an exterior wall the vertical
chimney system can be connected to the structural
wall system at a minimum of four-foot (4’) intervals.
This connection can be made using 18 gauge strap ties
(Simpson Strong Tie CS coil strap, or equivalent).
Starting on one side of the DM chimney, at four foot (4’)
intervals up the structural wall adjoining the chimney,
connect one 18 gauge strap tie to the structural wall
with two, three-inch (3”) #8 (minimum) wood screws or
masonry anchors, as appropriate.
Next, fold the strap around the three exposed sides of
the outer casing. Connect the strap to each of the three
outer casing faces with two, one and one-half inch (1
1/2”) long masonry anchors, such as “Tapcon” or “Titen”
screws. Fasten the strap back to the structural wall
with two three-inch (3”) # 8 (minimum) wood screws or
masonry screws, as appropriate
(Figure 32)
.
Where DM chimneys are built up from the interior walls
the DM chimney outer casing block is to be laterally
braced at ceiling and roof penetrations.
Pressure treated 2” x 4” blocks, set at each side of
the flue between the trusses or rafters and fastened
to the pre-engineered roof trusses or rafters with two
16d common nails at each end, provides lateral support,
parallel with the framing. Additionally, a two inch (2”) by
four inch (4”) by six feet (6’) minimum pressure treated
member (“rat run”) installed on each side of and butted
up to the outer casing block will provide lateral support
perpendicular to the direction of the truss or rafter
framing system.
Fasten the perpendicular member with two 16d common
nails to each intersecting truss or rafter. The perpendicular
bracing should be installed on the top side the ceiling
level framing as well as on the bottom side of the rafters
(Figure 33)
.
DM Chimney Installation - Straight Run
