G. Install Metal Roof Flashing
Note: Skip this section if using the RF4-8.
• See minimum vent heights for various pitched roofs
(Figure 8.14) to determine the length of pipe to extend
through the roof.
• Slide the roof fl ashing over the pipe sections extending
through the roof as shown in Figure 8.15.
HORIZONTAL
OVERHANG
2 FT.
20 INCHES MIN.
VERTICAL
MIN.
WALL
LOWEST
DISCHARGE
OPENING
GAS DIRECT VENT
TERMINATION CAP
X
12
ROOF PITCH
IS X/ 12
H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
Roof Pitch
H (Min.) Ft.
Flat to 6/12........................................ 1.0*
Over 6/12 to 7/12 ............................ 1.25*
Over 7/12 to 8/12 .............................. 1.5*
Over 8/12 to 9/12 .............................. 2.0*
Over 9/12 to 10/12 ............................. 2.5
Over 10/12 to 11/12 ......................... 3.25
Over 11/12 to 12/12 ........................... 4.0
Over 12/12 to 14/12 ........................... 5.0
Over 14/12 to 16/12 ........................... 6.0
Over 16/12 to 18/12 ........................... 7.0
Over 18/12 to 20/12 ........................... 7.5
Over 20/12 to 21/12 ........................... 8.0
* 3 foot minimum in snow regions
Figure 8.14 Minimum Height From Roof To Lowest Discharge
Opening
NOTICE: Failure to properly caulk the roof fl ashing could
cause water entry.
• Caulk the gap between the roof fl ashing and the outside
diameter of the pipe.
• Caulk the perimeter of the fl ashing where it contacts the
roof surface. See Figure 8.15.