DuraVent duraplus Installation Instructions Manual page 11

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. Slip the Insulation Shield over the Chimney
and Firestop Radiation Shield until the base
sits squarely on the framed opening. (Figure
7).
d. Nail the Insulation Shield to the top of the
framed opening with at least two 8-penny nails
per side. (Figure 12).
e. Wrap the Collar around the chimney and
fasten it loosely. Slide the Collar down to meet
the Insulation Shield. Slip the tab through the
adjacent slot and fold it back to tighten the
Collar. (Figure 13).
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 chimney above the roof. Allow space
to permit sliding the next Chimney Section
up through the Flashing. Always insure the
chimney remains vertical, and that at least a
2-inch clearance to combustible materials is
maintained all around. Install the upper edge
of the Flashing under the roofing. Nail to the
roof along the upper edge and the upper half
on each side with 1-inch roofing nails. Do
not nail the lower edge of the Flashing, or the
lower half of the sides. (Figure 14). Seal all
nail heads with a non-hardening waterproof
sealant. On flat or tarred and graveled roofs,
nail and seal the Flat Roof Flashing to the roof
on all sides with roofing compound. Do not put
screws through the Flashing into the Chimney
Pipe.
10. Finish Top: Apply a non-hardening
waterproof sealant around the chimney at the
point where the Storm Collar will meet the
WARNING: IF CHIMNEY
IS ENCLOSED IN ATTIC
AREA, YOU MUST USE
VENTILATED FLASHING.
Figure 12
Figure 13
1 INCH ROOFING
NAILS ALONG TOP OF
FLASHING
Figure 14
SDP-IS
PUSH COLLAR
DOWN TO
FLASHING AND
SEAL WITH
NON-HARDENING
SEALANT.
(SEALANT SHOWN
IN HEAVY LINE)
STORM COLLAR
SDP-SC
FLASHING
SDP-F
SDP-TF
11