How is a waste drain vent pipe vertical clearance measured?

by Hari Ganti   Last Updated January 30, 2018 23:21 PM

In my jurisdiction, a waste drain vent pipe must terminate 6" above the roof (or other vertical surface if it's not sloped). Is this typicallt measured on the ridge side or the eave side? For a 4" vent (like mine), it would mean a difference of about 2.5" on my 7/12 roof.

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