Which of the following is recommended for use with asphalt shingles, slate, and wood roof systems?

Step flashing is specifically designed to work effectively with asphalt shingles, slate, and wood roof systems by providing a reliable method of waterproofing at roof-to-wall intersections and where roofing meets vertical surfaces. It consists of sections of metal that are installed in overlapping layers, ensuring that water flows away from these vulnerable areas rather than being allowed to seep underneath the shingles or other roofing materials.

The primary purpose of step flashing is to create a weather-tight seal that prevents water intrusion, which is particularly important in areas where different surfaces meet. As water flows down the roof, the step flashing directs it away from potential entry points, thus reducing the risk of leaks and associated damage.

In contrast, while continuous flashing is useful for certain applications, it is generally not as effective in providing the same level of localized protection that step flashing offers at joints and transitions. Cricket flashing is utilized to direct water around the back side of chimneys and is not meant for the same range of applications as step flashing. Counter flashing is installed at the junction of masonry and roofing to cover and protect other flashing materials, but again, it does not serve the same purpose as step flashing in terms of application versatility across various roofing systems.