Roofing / Weatherproofing strip
Flashing
/ˈflæʃ.ɪŋ/noun
From flash, an old word meaning “to splash” water.
Definition
Thin pieces of metal or waterproof membrane fitted at joints, edges, and openings in a roof or wall to direct water away and keep it out.
Fig. 89 — Flashing: schematic studyNOT TO SCALE
Illustrative study — Flashing · AI-generatedSAMPLE IMAGE
Photo study — Flashing · AI-generated00:06
Structural & construction notes
Flashing works by overlapping like shingles, upper pieces over lower ones, so water always runs outward. Common types include step flashing beside walls, counter-flashing set into masonry, valley liners, and drip edges.
An educational reference. Project-specific design requires professional guidance.