Metal Sales Snap-Loc 24 Installation - Manual (Page 53)

© Metal Sales Manufacturing Corporation / Subject to change without notice. 10/99
SNAP-LOC 24
52
ROOF PENETRATIONS AND CURBS
GENERAL
VENT PIPES
VENT PIPE
ROOF CURB
Another important consideration is the size and location of all roof penetrations and roof mounted
mechanical units.
Areas around roof vents or rooftop units may show that corrosive fumes are emmitted from a process
within the building. If highly corrosive conditions are present, metal panel might not be the best
solution for roofing.
On buildings that are being retrofitted with metal roofing it should be asked which units can be re-
moved from the old roof and do any need to be added. If new equipment is to be added, will it have the
same weight, opening, etc. of the old units? If any units require a high amount of maintenance, a
walkway should be considered.
For retrofit roofs, installation of roof penetrations, curbs, and roof mounted mechanical units must be
installed as panel installation occurs.
The following procedures are for vent pipes 9" or less and not transmitting extremely hot or
caustic materials.
When installing vent pipes abide by the local plumbing codes.
STEPS
1. Determine the size and length of the vent pipe to be raised.
2. Take the appropriate measurements for the vent location and mark them on the Snap-Loc 24
panel. The vent pipe must extend through the flat of the roof panel. If the vent pipe extension
cannot be raised directly into the flat of the new roof panel, elbows should be used to offset the
pipe. Cut the panel to fit the vent pipe properly.
3. Use a light gauge angle to secure and plumb the vent pipe to the framing system.
4. Flash the vent pipe with a Rubber Roof Jack or similar pipe flashing.
5. Apply Tube Sealant between the panel and the base of the Rubber Roof Jack as well as the top
where the boot meets the pipe.
6. Attach the base of the Rubber Roof Jack to the panel using # 1 /
4
-14 x 7 /
8
" Stitch XL fasteners.