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High Wind Vertical
Termination
Storm Collar
Roof Flashing
Optional
Low Profile
Termination
Cap
Secure Flashing
with Non-
hardening Sealant
and Roofing Nails
Figure 38
Step 10. Holding the bottom of the termination cap only,
twist lock the cap onto the last pipe section protruding
above the roofline.
NOTES:
1. For multi-story vertical installations, a ceiling firestop is
required at the second floor, and any subsequent floors.
(Figure 39) Cut and frame a 9" x 9" (229 x 229 mm)
square opening for installation of the ceiling firestop.
2. If vent passes through any occupied areas above the
first floor, including closets and storage spaces, it must
be enclosed. The enclosure may be framed and covered
with sheet rock with standard construction materials, but
required clearances to combustibles must be maintained.
Consult these installation instructions for the minimum
allowable clearances between the outside of the vent
pipe and the combustible surfaces of the enclosure. Do
not fill required air spaces with insulation.
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 appropriate insulation
level, then attach the collar at the top of assembly. (Figure
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.
21
ST990
above roof
8/07
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 Cathedral 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. (Figure 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.
Attic
Insulation Shield
Required
Clearance
Figure 39
ST991
attic insul shield
Level
8/07
Cathedral Ceiling
Support Box
Figure 40
ST992
Nails
Minimum
Clearance
Minimum
Clearance
2" Min. Below
Finished
Ceiling
Cut Hole 1/8"
Larger than
Support Box
20012761
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