What type of flashing is recommended on the downslope side of a chimney?

The recommended type of flashing on the downslope side of a chimney is apron flashing. Apron flashing is specifically designed to direct water away from the chimney and prevent it from seeping behind the chimney structure. This type of flashing is installed where the roof surface meets the chimney, acting as a protective barrier to manage water flow.

When installed properly, apron flashing helps to ensure that any water running down the roof is routed away from the chimney and towards the gutters, which helps to minimize the risk of leaks and water damage. It fits over the top edge of the roofing material, providing an effective seal.

In contrast, step flashing is typically used around the sides of a chimney, creating a step-like effect to channel water away, while counter flashing is installed above the step flashing to cover it and further protect against water intrusion. Base flashing is generally used at the low point of a roof or wall intersection but is not appropriate for the downslope side of a chimney. Therefore, apron flashing is the most effective choice for this specific scenario.