Which term is defined as the portion of the flashing attached to or resting on the deck to direct the flow of water onto the roof covering?

• A. Base flashing
• B. Cap flashing
• C. Buckling
• D. Bundle

Answer: (A)

Base flashing is the portion of the flashing that is attached to or rests on the deck, and its job is to direct water onto the roof covering rather than allow it to seep under the shingles. It forms the foundation at the roof edge or along a wall intersection, sitting on the deck and often extending up the wall to create a continuous, water-shedding surface. Cap flashing, by contrast, covers the top edge or seam to further deflect water away where the vertical surface meets the flashing. Buckling describes a wrinkle or deformity in metal flashing, not a function, and a bundle refers to a group of shingles rather than a flashing component.