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I need to poke a hole in my flat roof (sloped, built-up roof of tar and felt) to accommodate a new vent. The vent will be 2" PVC.

Is there a minimum distance from the exterior brick wall to place this hole, either by code or best practice? I see that there's a bit of slope to the roof membrane where it joins the parapet wall, and I assume I'll want enough distance to place a standard boot or flashing, e.g.

1 foot?

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