Most homes are plumbed with 1 1/2" ABS pipe for venting. I have seen a few that were 2", but we are talking 1% or less of the 1000 or so roofs I have looked at over the years.
If you need to, you can enlarge the hole so you have 1/2" clearance around the pipe and add a couple and short piece of pipe. On metal roofs I like for the pipe to be a little long and then cut it off after I glue it in, I will cut it 1 1/2" above the roof line and install a metal vent cap.
- plumbing vent cap
- plumbventcap.JPG (17.14 KiB) Viewed 1149 times
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All information and advice given is for entertainment and informational purposes only. The person doing the work is solely responsible to insure that their work complies with their local building code and OSHA safety regulations.