Understanding the Roof Flashing (Deck Tight)

What happens here

The narrator introduces a crucial component: the high-temperature rubber roof seal, also known as a flashing boot. This orange, malleable rubber cone with a metal base is designed to fit over the insulated chimney pipe and seal against the corrugated metal roof. The malleability allows it to conform to the roof's ridges. The flashing is indexed with different size rings to be cut for various pipe diameters. He plans to apply high-temperature RTV silicone around the seal to ensure a watertight and airtight fit.

Goal: Learn about and prepare the high-temperature rubber roof flashing.