What term describes a metal used to prevent water from seeping into a house?

Flashing is a specific construction component that is used to direct water away from critical areas of a building, particularly around roof intersections, chimneys, walls, and other structures where water may penetrate. It typically consists of thin strips of metal, though it can also be made from other materials. The primary purpose of flashing is to prevent water infiltration at vulnerable points, thereby protecting the integrity of the structure and preventing potential water damage.

In contrast, caulking is primarily used to fill gaps and cracks to seal seams and joints, though it does contribute to preventing unwanted water entry. Sheathing refers to the layer of material applied to the exterior of a structure, serving as a base for siding, insulation, or roofing but is not primarily designed for water diversion. Moisture barriers are materials specifically designed to resist the passage of water vapor but do not function in the same way as flashing in directing water away from structures. Thus, flashing is the most fitting term for a metal component specifically intended to prevent water seepage into a house.