Word of the Day 18 September 2026

apron flashing

A flashing located at the juncture of the top of a sloped roof and a vertical wall, chimney or steeper-sloped roof.

Why this one

Roofing vocabulary is almost entirely about managing joints, and this is the joint that leaks first when it is done badly.

In use

Water's tracking down inside the chimney breast, so pull the tiles back and let's see what the apron flashing's doing under there.

Written by our editors to show how the term is used, not a recorded quotation.

Sources