NOTE:
If after installation of attic insulation shield the chimney
must, at some later time, be totally enclosed, remove
the attic shield collar as shown in Figure 9.
IMPORTANT OPTION:
In the cases where the location of the
chimney for a low pitch roof situation makes installation of the attic
shield impossible and enclosure of the chimney difficult, a third
method of protection is shown in Figure 8. It is possible to install
the roof support as shown in Figure 8, described in Section b.
The steep pitch roof support, RSA24, can be used as long as the
2-inch minimum dimension shown in Figure 8 is maintained.
4.1 Joist Shield Cat No. 8HS-JS
A joist shield for 8" chimney may be installed to reduce
clearances to combustibles and/or a firestop for passing
through floors, ceilings and roofs with 16" o.c. construction.
See Joist Shield instructions.
5. 30° Cat. No. 6, 8 HS/HSS-030
The 30° offset fittings let the chimney “go around” joists, rafters,
or other projections as shown in Figure 10. A pair of 30° offset
fittings will permit the following horizontal offsets to be obtained.
Size 6 in. = 4³/
8
in.
Size 8 in. = 4³/
8
in.
Maximum of two (2) sets of offsets allowed. If an additional
horizontal offset is required, up to 6 feet of chimney sections
may be installed between the offsets as shown in Figure 10.
For each foot of added chimney section, the horizontal offset
increases by approximately 6 inches. At any time, the maximum
permitted offset from the vertical is 30°. When offsets are used,
the chimney should be supported using Support Bracket
Assembly (see Figure 10). You may need to temporarily support
the offset during assembly. The offsets use the same locking
system as the pipe sections described in Section A.2. Page 2.
6. Chimney Cap Cat. No. 6, 8HS-RCS,
Storm Collar Cat. No. 6, 8SC
Roof Flashing Cat. No. 6, 8F
a. Using a plumb line when necessary to locate a perfectly
straight chimney stack, locate and cut an opening in the
roof large enough to provide at least a 2-inch airspace
clearance to chimney. DO NOT CUT RIDGE BOARD.
Avoid cutting rafters, if possible, by use of offsets
described in Section A.5, Page 4. If rafter must be cut,
install headers between the nearest uncut rafters. Frame
opening, allowing at least a 2-inch airspace clearance
between chimney and combustibles (see Figure 11).
b. Finish the chimney to a height at least 3 feet above the
roof and at least 2 feet higher than any portion of the
building within 10 feet (see Figure 12).
c. Place the roof flashing suitable for the roof pitch
(see Figure 13) over the chimney pipe, and, using care
to maintain a 2-inch minimum clearance, nail securely
with minimum of three (3) roofing nails to the roof
through the side and top of plate. (DO NOT nail through
the bottom of plate.) All parts exposed to weather should
be painted. A light color paint must be used on the
outside chimney walls and be capable of withstanding at
least 400°F temperatures. Cover nail heads with
waterproof bead of high-temperature silicon sealant.
d. Finish roofing around chimney, covering the side and
upper edges of flashing plate with roofing material
(see Figure 14). Be sure the lower unnailed portion of
the plate covers the roofing material.
4
AmeriVent Model HS/HSS All-Fuel Chimney
Installation Instructions
