55
Earthcore Industries
MAGNUM Series Fireplace
55
Specialty Applications - Two-Story Stacked Installations
General Information
To install one Fireplace and DM chimney system above
one another, as in a two-story stacked installation, both
the upper and lower fireplace installations require a
structurally designed support down to footings designed
by a structural engineer.
Frequently, in two-story stacked installations, the lower
unit is supported by a slab-on-grade, whereas the upper
unit is a typical off-grade support. The off-grade slab for
the upper unit must be built with sufficient width in order
to accommodate the width of the upper fireplace plus
the width of the by-passing chimney system rising from
the lower unit
(Figure 71)
.
The slab for the lower unit will need to be built with
enough width to provide support for the lower fireplace
unit plus the bearing surface for the support columns
needed to carry the offset chimney sequence of the
lower system
(Figure 71)
.
Floor-to-Floor Height Considerations
In order for the lower fireplace installation to have
enough overhead height clearance for its chimney to rise
at a thirty degree (30°) angle of offset (maximum angle of
offset as allowed by code) and bypass to one side of the
firebox in the upper location, there are minimum required
floor-to-floor height dimensions. (See chart on page 56
Dimension “F”).
The minimum floor-to-floor height required for an
installation is determined by calculating the total
horizontal distance the lower flue must travel to the left
or right for it to bypass to one side of the upper fireplace.
(see calculating offsets on pages 47-49)
The total amount of horizontal chimney offset travel
distance will be determined by two factors:
1.
The width dimension of the upper unit; and
2.
The horizontal distance between centerlines of the
proposed upper and lower units.
Example:
If the upper fireplace and the lower fireplace
sit on the same centerline, then the required floor-to-floor
dimension is at a maximum (See Figure 71 and chart on
page 56 Dimension “F”.)
For every 3” of horizontal distance separating the
centerlines of the upper and lower units, the overall
height of the offset sequence is reduced by one offset
block or by 6”.
FIGURE 71
