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As said the painting of the pipe is just an estetic thing or a local code.
The code for the height is 2 feet above and structure that is 10 feet away so if your on a slanted roof, the top of vent pipe is 2 ft above any roof area that is in a 10 ft radius and as said 3 ft away of any structur opening such as the skylight.
This is why it is is easier to jut bring the pipe close to the ridge and up the 2 feet.
Gerry
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