M&G DuraVent DuraPlus® - Manual (Page 10)

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illustrates the two-story building. In the case
of the two-story installation, the base of the
Firestop Radiation Shield is nailed to the top
of the framing, with the pan (the depressed
portion of the base), facing downwards. For
the multi-story installation, the base is nailed to
the bottom of the framing with the pan facing
upwards. The cylindrical component of the
Firestop Radiation Shield is then slipped down
through the base from the top until it rest on
the bead. (Figure 9). Refer to Table 2 for the
framing requirements.
7. Assemble Chimney Sections: Lower
and seat the female end of the first Chimney
Section in the Support Box. (Figure 11). It
will twist-lock onto the male end of a Low
Profile Starter Section, which is a component
of the Support Box. Turn Pipe Sections
clockwise, firmly to lock them together. Sheet
metal screws may be used to reinforce the
connection, however they are not normally
required. Screws are only acceptable in the
outer liner.
8. Install Attic Insulation Shield: Install
the Attic Insulation Shield where the chimney
passes into an attic. It’s purpose is to prevent
debris and insulation from getting too close to
the chimney. (Figure 12). An installed Attic
Insulation Shield is 14 inches high. In attic
areas where this shield won’t fit, a Square
Support Box, (which is available in heights
up to 36 inches), can be used instead of an
Attic Insulation Shield, provided it reaches
through the roof; refer to the Roof Supported
installation section on page 14. If the
chimney is fully enclosed through the attic,
an Insulation Shield is not required, however,
again, Ventilated Flashing must be used.
Where the chimney passes into the attic,
install the Attic Insulation Shield as follows:
a. If the Firestop Radiation Shield extends
above the attic floor, no modifications are
Figure 9
FRAMING
NAILS (AT LEAST 2 PER SIDE)
FIRESTOP RADIATION SHIELD SDP-FRS
NAILS (AT
LEAST
2 PER
SIDE)
FRAMING
FIRESTOP RADIATION
SHIELD SDP-FRS
Figure 10
Figure 11
VENTILATED FLASHING
CHIMNEY SECTION
SDP-P
SUPPORT BOx
SDP-S, SDP-RS, SDP-SB
MULTI-STORY GOING
INTO NExT FLOOR
TWO-STORY GOING
INTO ATTIC