For Vertical Terminations - To locate the vent and install the vent sections:
• Locate and mark the vent centerpoint on the underside |
of the roof, and drive a nail through the centerpoint. |
• Make the outline of the roof hole around the centerpoint |
nail. |
• The size of the roof hole framing dimensions depend on the |
pitch of the roof. There MUST BE a |
ance from the vertical vent pipe to combustible materials. |
• Mark the roof hole accordingly. |
To seal the roof hole, and to divert rain and snow from the vent system:
•Attach a flashing to the roof using nails, and use a non- hardening mastic around the edges of the flashing base where it meets the roof.
•Attach a storm collar over the flashing joint to form a
•Slide the termination cap over the end of the vent pipe and rotate the pipe clockwise 1/4 turn.
• Cover the opening of the installed vent pipes. |
• Cut and frame the roof hole. |
• Use framing lumber the same size as the roof rafters |
and install the frame securely. Flashing anchored to the |
frame must withstand heavy winds. |
• Continue to install concentric vent sections up through |
the roof hole and up past the roof line until you reach the |
appropriate distance above the roof. |
2 FT. | 2 FT. MIN. |
MIN. |
|
| LOWEST |
| DISCHARGE |
TERMINATION | OPENING |
| |
CAP |
|
HORIZONTAL
OVERHANG
VERTICAL
WALL
X
12
!WARNING: MAJOR U.S. BUILDING CODES SPECIFY MINIMUM CHIMNEY AND/OR
VENT HEIGHT ABOVE THE ROOF TOP. THESE MIN- IMUM HEIGHTS ARE NECESSARY IN THE INTER- EST OF SAFETY. SEE THE FOLLOWING DIAGRAM FOR MINIMUM HEIGHTS, PROVIDED THE TERMI- NATION CAP IS AT LEAST TWO (2) FEET FROM A VERTICAL WALL AND
NOTE: This also pertains to vertical vent systems in- stalled on the outside of the building.
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 |
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 |
Figure 32. Minimum Height from Roof to Lowest Discharge Opening
31
