DuraVent DuraPlus HTC - Manual (Page 12)

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not interfere with the Roof Flashing. Secure
Roof Radiation Shield to the roof using at (2)
roofing nails or (2) #8, 1-1/2” wood screws as
shown in Figure 12.
10. 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 (use a level),
and that at least a 2-inch (50 mm) 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 down each side
with 1-inch (25 mm) roofing nails. Do not
nail the lower edge of the Flashing (Fig 13).
Be sure to follow local building practices,
as needed. 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.
11. Finish Top: Apply a high-temperature
(500°F/260°C), non-hardening waterproof
sealant around the chimney at the point
where the Storm Collar will meet the chimney
just above the Flashing. (Fig 13). Slide the
Storm Collar down over the chimney to
the top of the Flashing. Tighten and seal
the Storm Collar against the sealant. After
installing sufficient Chimney Sections to meet
the height requirement (Fig 1), attach the
Chimney Cap onto the top of the chimney
by holding the collar of the cap and twist
locking it clockwise onto the chimney. Do
not hold upper portion of the cap and twist,
as this may damage the cap. The Chimney
Cap can be removed for chimney cleaning
as described in the Chimney Maintenance
section of the instructions. Use an Extended
Roof Bracket if the chimney extends more
than 4-feet (1.2 m) above the roof, and
another Extended Roof Bracket for every
additional 4-feet (1.2 m) that the chimney
extends above the roof penetration. (Figures
16 & 17 in the Extended Roof Bracket
section). If you are located in heavy snow
country, thought must be given to protecting
the chimney from damage due to sliding
snow and ice. In these cases, locating the
chimney as close as possible to the ridge
line is recommended. Important: A snow
splitter offers no absolute guarantee against
damage. The best defense against snow
and ice damage is to locate the chimney
out of harm's way, or to remove snow & ice
as required before it can accumulate to a
dangerous level.
12. Enclosures: Enclose chimneys where
they pass through occupied spaces, including
closets. Always maintain at least a 2 inch (50
mm) clearance between the chimney and any
combustible materials. Interior enclosures
may be constructed with standard framing
and sheathed with sheetrock or plywood.
Use Wall Straps at least every 8-feet (2.4
m) to maintain a minimum of 2 inches (50
mm) of air space between the chimney and
combustible materials.