DuraVent DuraChimney II - Manual (Page 10)

10
enclose the attic portion of the chimney in
a framed enclosure (always maintain 2”
air-space clearance to combustibles). If the
chimney is fully enclosed through the attic, an
Attic Insulation Shield is not required. Install
the Attic Insulation Shield as follows:
a. Remove any insulation or debris from attic
floor around the framed opening.
b. Assemble Chimney Sections until at least 18
inches of chimney extends above the Firestop.
c. Slip the Attic Insulation Shield over the
Chimney until the base sits squarely on the
framed opening (Fig. 9).
d. Secure the Attic Insulation Shield to the
top of the framed opening using at least (2)
8-penny nails or (2) #8, 1-1/2” wood screws
per side (Fig. 10).
e. 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. Tighten the bolts to secure
the Collar in place (Fig. 10).
11. Install Roof Radiation Shields: Roof
Radiation Shields provide protection for roof
or chase framing members. Note: Roof
Radiation Shields do not allow for a reduced
clearance to combustibles. Clearance
to combustibles must be a minimum of 2"
away from the chimney pipe. Install Roof
Radiation Shields at either the top of the
chase or where the chimney penetrates the
roof, whichever is the top of the installation.
Roof Radiation Shields are built with a 1/2" air
gap standoff from the joist face (Fig. 11). The
corners of the Roof Radiation Shields overlap
each other to ensure proper position. Secure
the Roof Radiation Shields to the top of the
framing members using screws or nails in the
corners (Fig. 11). If framing members are further
away from the chimney than 2", center the Roof
Radiation Shield to the chimney on the framing
Figure 13
1 1/2” VENTILATION OPENING
AROUND CHIMNEY PIPE
MINIMUM
1/2 INCH
AIR SPACE
1/2 INCH
ESTABLISHED
BY SPACERS
AIR SPACE
1/2"
CHASE TOP
FLASHING
REQUIRED
SPACERS
Figure 12
Figure 11
(4) ROOF
RADIATION
SHIELDS
CHASE
ENCLOSURE