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PENETRATING THE ROOF
To maintain a 1-inch clearance to the pipe on a roof with a
pitch, a rectangular opening must be cut.
STEP 1:
Determine the center point through which the pipe
will penetrate the roof.
STEP 2:
Determine the center point of the roof. Pitch is the
distance the roof drops over a given span, usually 12 inches.
A 6/12 pitch means that the roof drops 6 inches for each 12
inches one measure horizontally down from the roof rafters.
STEP 3:
Use the roof opening chart (figure 12) to determine
the correct opening length and flashing required.
STEP 4:
Remove the shingles around the opening measured
and cut out this section.
STEP 5:
Add the next sections of the pipe until the end
penetrates the roofline. Check to see that the proper
clearances are maintained. Extend chimney by adding
sections of double wall pipe until pipe is a minimum of 30
inches above the highest point of the roof cutout. Termination
and chimney must extend a minimum of 36 inches above the
highest point where it passes through roof.
FLASHING INSTALLATION (V6F-8DM or V12F-8DM)
Determine the flashing to be used with the roof opening chart.
Slide flashing over pipe until base is flat against roof. Replace
as many shingles as needed to cover exposed area and flashing
base. Secure in position by nailing through shingles (see
figure 13).
DO NOT NAIL THROUGH FLASHING CONE.
INSTALLING FLASHING ON A METAL ROOF
When installing the flashing on a metal roof, it is required that
putty tape be used between the flashing and the roof. The
flashing must be secured to the roof using #8 x ¾” screws and
then sealed with roof coating to prevent leakage through the
screw holes. A roof coating must also be applied around the
perimeter of the flashing to provide a proper seal.
STORM COLLAR INSTALLATION (SC1 or SC2)
Place storm collar over pipe and slide down until it is snug
against the open edge of the flashing (see figure 14). Use SC1
for all round terminations and SC2 for all terminations with
slip sections. Apply waterproof caulk around the perimeter of
the collar to provide a proper seal.
Figure 12 ROOF OPENING CHART
PITCH
SLOPE
OPENING "A" MAX
USE FLASHING
(degrees)
(inches)
MODEL NO.
FLAT
0
15
V6F-8DM
0 - 6/12
26.6
16 - 1/8
V6F-8DM
6/12 - 12/12
45.0
20 - 3/8
V12F-8DM
Figure 13 FLASHING INSTALLATION
Figure 14 STORM COLLAR
