Isokern Magnum 86072-60, Installation, Operation And Owner'S Manual

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DM Chimney System: Load Capacity - Brick Ledge
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Notes:
Calculation of wind load requires the services of a local
structural engineer who can evaluate wind load for the specific
structure and site in question.
Do not subject the brickledge to unequal loading when
applying veneers. Build veneers equally on all four sides of the
brickledge.
Brickledge Veneer Finish and Flashing Details:
When applying brick, stone or other masonry veneer
to the Isokern brickledge 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
thirty-two inches (32”)square with a twenty inch (20”) square
hole in it, to serve as an inner flashing. (Figure 95)
Place the inner flashing on the first DM outer casing
block that fully clears the roof line. Keep the flashing to about
a one-half inch (1/2”) lap onto the top of the outer casing block.
The twenty inch (20”) square hole in the flashing should fit to the
outside of the alignment grooves on top of the DM outer casing.
Continue the DM chimney up to the required termination height.
Once the masonry veneer is in progress the inner
flashing is set into a horizontal joint in the veneer at a level
above all other roof deck flashings, chimney-to-roof flashings
and counter flashings. Weep holes should open to the outer face
of the veneer at vertical mortar joints located at the level of the
inner flashing. (Figure 96)
Where moisture may develop between the DM outer
casing and the chimney veneer, inner flashings as described
above will help to divert such moisture to exterior face of the
veneer by way of the weep holes and thereby keep such moisture
from working its way down between the veneer facing and the
DM outer casing and into the interior of the structure below.
FIGURE 96
FIGURE 95
INNER
FLASHING