Isokern Standard 36 - Masonry Veneer Construction Details

2"6"
4" 2"
BEARING
2"6"
COMBUSTIBLE
SHEATHING
MIN. CLEARANCE
BRICK
VENEER
COMBUSTIBLE
SHEATHING
MASONRY VENEER
4x6 STEEL “L”
MASONRY BEYOND
AIR SPACE
MORTAR JOINT
MIN. CLEARANCE
26
Masonry Veneer Construction Details
Brick, stone or other masonry veneer nished fronts to
replaces are possible. Special attention is required with regards
to:
(1) the placement of the proposed masonry veneer facing
and its interface with the re brick lining, and
(2) the masonry veneer and clearance to combustible
framing and sheathing from any steel “L” support used in the
masonry veneer around the front of the replace unit behind the
veneer facing.
Any proposed brick, stone or other masonry veneer
facing must have sufcient foundation to support the full weight
of the veneer work. This may require review by a local structural
engineer prior to construction.
The veneer facing, when installed, must present a tight
seal with the leading edge - the room edge - of the re brick lining
at the sides of the rebox opening. (Figure 39)
A steel “L” will need to span the top of the nished
replace opening to carry the masonry veneer as it spans over the
rebox opening. (Figure 37)
By code requirement this steel “L” must have a minimum
four inch (4”) end bearing. This bearing surface area shall be
provided in the veneer work. (Figure 39) It is important that the
steel “L” is set tight against the damper beam front and set in a
mud joint to avoid creating a “false chimney” between the back of
the steel “L” and the damper beam front. (Figure 39)
Steel “L” or “angle” used to support masonry veneer
as it spans the rebox opening must, in all cases, have a two
inch (2”) minimum clearance to all combustible materials. The
vertical leg of the steel “L” cannot exceed six inches (6”) in
height.
Note: Properly placed combustible sheathing is kept a
minimum of eight inches (8”) away from the rebox opening
sides and top.
Important: Combustible framing members, normally set at
one and one-half inch (1-1/2”) clearance to the sides of the
rebox must be moved to at least two inch (2”) clearance to the
rebox sidewalls to maintain minimum two inch (2”) clearance
to the steel “L” to avoid a potential re hazard.
Moving framing members two inches (2”) away from
the rebox side walls will maintain the minimum required two
inch (2”) clearance from the steel “L” and, at the same time
allow full four inch (4”) end bearing required for the steel “L”.
(Figure 38)
FIGURE 38
FIGURE 39