What is the type of flashing used to waterproof joints between sloping roofs and vertical walls?

The type of flashing specifically used to waterproof the joints between sloping roofs and vertical walls is step-flashing. Step-flashing consists of individual pieces of flashing that are layered with the shingles of the roof. This creative design allows water to flow off the roof and down the wall without penetrating the joint. Each piece is typically installed in a way that allows it to step up the slope of the roof, mirroring the angled cuts of the shingles, which effectively directs water away from vulnerable areas.

Continuous flashing, while useful in certain applications, is a single strip of flashing that may not adapt well to joint configurations involving different slopes. Drip edge is primarily intended to direct water off the edges of a roof to prevent water from seeping under the shingles, and counter-flashing is used to cover the upper edge of step-flashing where it meets the wall, not typically at the joint itself. Thus, step-flashing is the most suitable and effective choice for waterproofing between sloping roofs and walls.