www.desatech.com
115386-01B
10
VenTing inSTallaTion
Continued
Pitch
Slope Opening
"A" Max.
Used Flashing
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
4. Remove shingles around opening mea
-
sured. Cut out this section.
5. Add next sections of pipe until end
penetrates roof line. Check to see that
proper clearances are maintained. Extend
chimney by adding sections of double wall
pipe until pipe is minimum of 30" above
highest point of roof cutout. Termination
and chimney must extend a minimum of
36" above highest point where it passes
through roof.
Figure 14 - Roof Opening Measurements
FLASHING INSTALLATION (v6F-8DM
OR v12F-8DM)
Determine flashing to be used with roof open
-
ing 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 15, page 11). DO NOT
NAIL THROUGH FLASHING CONE.
Installing Flashing on a Metal Roof
When installing flashing on a metal roof, it
is required that putty tape be used between
flashing and roof. Flashing must be secured
to roof using #8 x 3/4" screws and then sealed
with roof coating to prevent leakage through
screw holes. A roof coating must also be ap
-
plied around perimeter of flashing to provide
a proper seal.
FIRESTOP SPACERS (FS-8DM)
Firestop spacers are required at each point
where chimney penetrates a floor space.
Their purpose is to establish and maintain
required clearance between chimney and
combustible materials. When pipe passes
through a framed opening into a living space
above, firestop must be placed onto ceiling
from below as shown in Figure 12.
They also provide complete separation from
one floor space to another or attic space as
required by most codes. When double wall
pipe passes through a framed opening into
an attic space, firestop must be placed into
an attic floor as shown in Figure 13.
Figure 12 - Firestop Spacer with Living
Space Above Ceiling
Figure 13 - Firestop Spacer with Attic
Space Above Ceiling
PENETRATING ROOF
To maintain a 2" clearance to pipe on a roof with
a pitch, a rectangular opening must be cut.
1. Determine center point where pipe will
penetrate the roof.
2. Determine center point of the roof. Pitch
is the distance the roof drops over a given
span, usually 12". A 6/12 pitch means that
the roof drops 6" for each 12" measure
horizontally down from roof rafters.
3. Use roof opening chart (Figure 14) to
determine correct opening length and
flashing required.
If area above is a living space, install
firestop below framed hole.
If area above is an attic or insulated area,
install firestop above framed hole.
30"
(76.2 cm)
Minimum Measurements
Opening "A"
16
3
/
8
"
(48.3 cm)
2"
(5.1
cm)
2"
(5.1
cm)
2"
(5.1 cm)
