Ask This Old House: Season 2, Episode 25 - ProjectFreeTV

2 - 25: Copper Pipe Corrosion; What Is It? Stripping a Drafty Door

Richard examines a viewer's corroded copper pipes and identifies the source of the corrosion: a rusty hot water heater. The guys ask "What is it?" Tom helps a homeowner replace the worn-out weather stripping around his drafty kitchen door.