At what location should moisture be directed away using apron flashings?

The appropriate location for directing moisture away using apron flashings is at the top-most edge where shingles or tiles meet. Apron flashings serve as a protective measure that channels water away from vulnerable areas, specifically where the roof intersects with vertical structures such as chimneys.

When shingles or tiles are installed around a chimney, there is a potential for water to seep under the roofing materials if not properly flashed. The apron flashing is designed to sit over the shingles or tiles, creating a barrier that directs water away from the intersection, mitigating the risk of leaks and water damage in that area. This positioning is crucial because it addresses the specific point where water can accumulate and infiltrate, ensuring that the roof remains watertight.

Directing moisture away from this top edge is essential for the longevity of both the roofing materials and the chimney structure, as improper drainage can lead to deterioration over time.