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roofing material overlaps the top edge of the flashing. Verify that the
minimum clearance to combustibles is maintained at the roof line. Slide
the storm collar over the pipe section and seal.
7. Continue to add pipe sections until the height of the vent cap meets the
minimum building code requirements described in the following chart,
Roof Pitch Vent Height Table. Note that for steep roof pitches, the vent
height must be increased. A poor draft, or down draft, can result from
high wind conditions, nearby trees, adjoining rooflines, steep pitched
roofs, and other similar factors. In these cases, increasing the vent
height may resolve the problem. Twist lock the vent terminal.
NOTE: If an offset is necessary in the attic to avoid obstructions, it is
important to support the vent pipe every three feet to avoid excessive
stress on the elbows. Wall strapping kits are available for this purpose.
NOTE: For multi-story vertical installations, a ceiling fire stop is
required at the second floor, and each subsequent floor thereafter.
The opening should be framed to 10” x 10” square inside
dimensions.
Any occupied areas in the first floor, including closets and storage
spaces, through which the venting passes, must be enclosed. The
enclosure may be framed and paneled with standard building
materials. DO NOT fill in any of the required air gaps with insulation.
