Step 2 · Locate the Vent Stack

This is the step most people slow down on. Take it one move at a time — there’s no rush, and you can rewind the clip as many times as you need.

Carefully climb the ladder and step onto the roof. Move slowly and deliberately. Locate the plumbing vent stack, which is a vertical pipe protruding from the roof. It is typically made of PVC (white plastic) or cast iron (black metal) and is usually 1.5 to 4 inches in diameter. Vents are often positioned directly above a bathroom or kitchen area. There may be more than one vent stack on your roof.