Cathedral Ceiling Installation - Vermont Castings Intrepid INDVRCB Homeowner's Installation And Operating Manual

High Wind Vertical
Termination
Storm Collar
Roof Flashing
Optional
Low Profile
Termination
Cap
Secure Flashing
with Non-harden-
ing Sealant and
Roofing Nails
3. If venting system passes through an attic space an
attic insulation shield must be installed to prevent
contact between pipe sections and the insulation.
Nail the base to floor of attic and adjust shield for ap-
propriate insulation level, then attach the collar at the
top of assembly. (Fig. 39) For vaulted ceilings, the
attic insulation shield cannot be installed. To prevent
building insulation and other debris from entering
the support box or contacting the pipe, a chase
enclosure can be constructed around the support
box. Ensure proper clearance to combustibles are
maintained.

Cathedral Ceiling Installation

Step 1. Follow installation Step 1 and 2 under Vertical
Termination.
Step 2. Using the plumb bob, mark the centerline of
the venting system on the ceiling and drill a small hole
through the ceiling and roof at this point. From the roof,
locate the drill hole and mark the outline of the Cathe-
dral Ceiling Support Box.
Step 3. Remove shingles or other roof covering as
necessary to cut the rectangular hole for the support
box. Cut the hole 1/8" (3 mm) larger than the support
box outline.
Step 4. Lower the support box through the hole in the
roof until each side of the bottom of the support box
protrudes at least 2" (51 mm) below the ceiling. (Fig.
20012761
Figure 38
ST990
Intrepid® Direct Vent - Rear Vent Gas Heater
Figure 39
Attic
Insulation Shield
Required
Clearance
ST991
40) Align the support box both vertically and horizontally
with a level. Temporarily tack the support box in place
through the inside walls and into the roof sheathing.
Level
Figure 40
Cathedral Ceiling
Support Box
ST992
Step 5. Using tin snips, cut the support box from the
top corners down to the roofline, and fold the resulting
flaps over the roof sheathing. The flaps may be trimmed
as needed. (Fig. 41) Before nailing it to the roof, run a
bead of non-hardening sealant around the support box
to make a seal between the support box and the roof.
Clean out any combustible material from inside the sup-
port box.
Step 6. Follow Steps 4 and 5 of the Vertical Installation
instructions.
Step 7. Place the support clamp (provided with the sup-
port box) inside the support box (at the bottom), and se-
cure to the pipe section. The clamp allows the support
box to support the weight of the pipe sections. Continue
to add pipe sections until you are above the roofline.
Nails
Minimum
Clearance
Minimum
Clearance
2" Min. Below
Finished Ceil-
ing
Cut Hole 1/8"
Larger than Sup-
port Box
21