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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
15
Framing Dimensions for Roof
Inches (millimeters)
Pitch C D
0/12
13 in.
(330 mm)
13 in.
(330 mm)
6/12
13 in.
(330 mm)
15-1/2 in.
(394 mm)
12/12
13 in.
(330 mm)
20-1/2 in.
(541 mm)
C
D
Figure 22 - Roof Framing
Figure 24
G. Continue installation of horizontal/inclined
sections - Continue with the installation of the
straight vent sections in horizontal/inclined run
as described in Step C. Install support straps
every 3' (914 mm) along horizontal/inclined
vent runs using conventional plumber’s tape.
See Page 17, Figure 28. It is very important
that the horizontal/inclined run be maintained
in a straight (no dips) and recommend to be in
a slightly elevated plane, in a direction away
from the fireplace 1/4" per foot (20 mm per
meter) which is ideal, through rise per foot run
ratios that are smaller are acceptable all the way
down to at or near level. Use a carpenter’s level
to measure from a constant surface and adjust
the support straps as necessary.
It is important to maintain the required clear-
ances to combustibles: 1" (25 mm) at all sides
for all vertical runs; and 3" (76 mm) at the top,
1" (25 mm) at sides, and 1" (25 mm) at the
bottom for all horizontal/inclined runs.
H. Frame roof opening - Identify location for
vent at the roof. Cut and/or frame opening per
Roof Framing Chart (Figure 22).
One method of support is by utilizing field pro
-
vided support straps (conventional plumber's
tape). Secure the plumber's tape to the framing
members with nails or screws.
Strap the tape
around the vent, securing the ends of the tape
to the framing. If desired, sheet metal screws #6
x 1/2" length may be used to secure the support
straps to the vent pipe. See Figure 20.
F. Change vent direction to horizontal/inclined
run - At transition from or to a horizontal/inclined
run, install the SV8 E45 and SV8 E90 elbows in
the same manner as the straight vent sections.
The elbows feature a twist section to allow them
to be routed about the center axis of their initial
collar section to align with the required direc-
tion of the next vent run element. Twist elbow
sections in a clockwise direction only so as
to avoid the possibility of unlocking any of
the previously connected vent sections. See
Figure 19 on Page 14 and Figure 21.
Figure 21
If the vent system extends more than 5 feet (1.5
m) above the roof flashing, stabilizers may be
necessary. Additional screws may be used at
section joints for added stability. Guide wires
may be attached to the joint for additional sup-
port on multiple joint configurations.
Swivel Joint
(360° swivel)
SV8E45
(45° Elbow)
Swivel Joint
(360° swivel)
SV8E90
(90° Elbow)
6"
(153mm)
10"
(254mm)
K. Install the vertical termination - The
final step involves installation of the Vertical
Termination. Extend the vent sections to the
height as shown in the "Vertical vent termina
-
tion section" on
Page 6. The SV8VTR Vertical
Termination (Figure 24) can be installed in the
exact same fashion as any other Secure Vent™
section. Align the termination over the end of
the previously installed section, adjusting the
radial alignment until the four locking dimples
of the termination are aligned with the inlets of
the four incline channels of the last vent section.
Push the termination down until it fully engages,
then twist the termination clockwise running the
dimples down and along the incline channels
until they seat at the end of the channels.
I. Install the roof flashing - Extend the vent
sections through the roof structure. Install the
roof flashing over the vent section and posi-
tion such that the vent column rises vertically
(use carpenters level) (Figure 23). Nail along
perimeter to secure flashing or adjust roofing
to overlap the flashing edges at top and sides
only and trim where necessary. Seal the top
and both sides of the flashing with waterproof
caulking.
J. Install the storm collar - Install the storm
collar, supplied with the flashing, over the
vent/flashing joint (see Figure 23). Loosen
the storm collar screw. Slide collar down until
it meets the top of the flashing. Tighten the ad-
justing screw. Apply non-combustible caulking
or mastic around the circumference of the joint
to provide a water tight seal.
Figure 23
Storm
Collar
Storm
Collar
Flashing