36
CAUTION:
When using the Isokern brick ledge, it is
required that the MAGNUM firebox/smoke dome
assembly include the placement of a 4” x 6” x 5/8”
minimum steel angle across the firebox opening.
Lateral Support for Isokern Brick Ledge Chimneys
Once the DM chimney and brick ledge are assembled and
after the intended masonry veneer has been installed on
the brick ledge, be sure to brace the chimney following
the guidelines of this manual for Lateral Support of DM
chimneys.
Load Capacity for DM Brick Ledge
The sources of load delivered into the Isokern brick ledge
are: (1) the total physical load of brick, stone or other
masonry veneer on the brick ledge, and (2) loading due
to the force of wind delivered against the exposed height
of the chimney mass.
The required height of any chimney is governed
by applicable local building codes. The overall finished
height of any chimney varies based upon site-specific
conditions (e.g. elevation of roof line, roof pitch, distance
of the chimney from the ridge, etc.).
It is relatively simple to calculate the total physical
load on the brick ledge resulting from the physical
weight of applied veneers built to code height. However,
calculation values for load to the brick ledge due to wind
are site specific and based on local variables such as wind
speed zone, exposure classification, eave height and roof
pitch of the structure, as well as height of chimney mass
exposed to wind.
IMPORTANT:
The total load delivered into the brick ledge
is job specific and will be the sum of:
1.
the physical load from veneers, plus
2.
the load due to wind.
IMPORTANT:
Do not subject the brick ledge to unequal
loading when applying veneers. Build veneers equally on
all four sides of the brick ledge.
Brick Ledge Veneer Finish and Flashing Details
When applying brick, stone or other masonry veneer to
the Isokern brick ledge, standard good building practices
for masonry veneer work should govern weather-proofing
details and the placement of flashings.
A typical flashing detail would be to field fabricate
an aluminum or galvanized sheet metal flashing,
approximately 32” square with a 20” square hole in it, to
serve as an inner flashing.
Place the inner flashing on the first DM outer casing
block that fully clears the roof line. Keep the flashing
to about a half inch (1/2”) lap onto the top of the outer
casing block. The twenty-inch (20”) square hole in the
Earthcore Industries
MAGNUM Series Fireplace
36
DM Brick Ledge
ISOKERN
BRICKLEDGE
FIGURE 41
