M&G DuraVent DuraTech® 5-8 - Manual (Page 10)

10
8. Install Attic Insulation Shield: The
Attic Insulation Shield is required where the
chimney passes into an attic. Its purpose is
to prevent debris and insulation from getting
too close to the chimney (Fig 10). An installed
Attic Insulation Shield is 15 inches high. In
attic areas where this shield cannot fit, you
must enclose the attic portion of the chimney
in a framed enclosure. If the chimney is fully
enclosed through the attic, an Attic Insulation
Shield is not required. If 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
necessary. The Firestop Radiation Shield will
fit inside the Attic Insulation Shield.
b. Assemble Chimney Sections until at least
18 inches of chimney extends above the
Firestop Radiation Shield.
c. Extend the Firestop Radiation Shield tube
extension (keep at least 1” overlap), and
secure in place using sheet metal screws.
d. Slip the Attic Insulation Shield over the
Chimney and Firestop Radiation Shield until
the base sits squarely on the framed opening
(Fig 7 & 10).
e. Secure the Attic Insulation Shield to the
top of the framed opening using at least (3)
8-penny nails or (3) #8, 1-1/2” wood screws
per side (Fig 10).
f. Wrap the Collar of the Attic Insulation Shield
around the chimney and fasten it loosely. Slide
the Collar down to meet the Attic Insulation
Shield. Slip the tab through the adjacent slot
and fold it back to tighten and secure the
Collar (Fig 11).
9. Attach Flashing: In new construction,
assemble the Chimney Sections to a point
above the roof, then slip the Flashing over
the chimney. On an existing roof, center
and install the Flashing before extending the
Figure 11
Figure 12
Figure 13
ROOFING
FASTENERS
ADJUSTABLE
FLASHING
PUSH COLLAR
DOWN TO
FLASHING AND
SEAL WITH NON-
HARDENING HIGH-
TEMP SILICONE
SEALANT
7. Assemble Chimney Sections: Lower
the female end of the first Chimney Section
in the Support Box (Fig 9). It will twist-lock
clockwise onto the male end of the Support
Box. Turn Pipe Sections firmly clockwise to
lock them together. Sheet metal screws are
not required, but they may be used to reinforce
the connection, if desired. Use only 1/2” (or
shorter) sheet metal screws. Do not penetrate
the inner liner of the chimney.