What type of flashing is best to prevent water from pooling near the base of a chimney?

Apron flashing is specifically designed to direct water away from the base of a chimney and prevent it from pooling in that area. It is installed at the intersection of the chimney and the roof slope, sloping downward from the chimney to carry water away from the structure. This is particularly important near a chimney, where water runoff can accumulate if not properly directed. The design and placement of apron flashing make it the most effective option for addressing potential water pooling issues around chimneys.

Other types of flashing, while useful in different contexts, do not offer the same level of protection in this specific application. Step flashing is generally used along the sides of chimneys and walls, while boot flashing is associated with vent pipes and other roof penetrations. Pan flashing is used beneath roofing materials to catch water, but it does not direct water away from a chimney effectively like apron flashing does.