flashing
FLASH-ing
/ˈflæʃ.ɪŋ/
Thin strips of sheet metal or synthetic material installed at roof joints and wall intersections to prevent water leakage.
Flashing is specifically engineered for critical architectural transitions, such as around chimneys, skylights, dormers, and valleys.
The story behind the word. Originates from Middle English 'flaschen', meaning to gush or splash water. Builders adopted the term because flashing metal is placed precisely where splashing or pooling water threatens to breach roof joints.
Word relationships
- weather stripping: Weather stripping seals operable door and window openings, whereas flashing permanently seals structural roof joints.
Commonly confused with
- gutter: Flashing protects underlying seams at roof intersections, whereas gutters collect and carry away water falling off the roof edge.
Word family
- flash (verb): To fit a roof joint or architectural angle with flashing metal.
Collocations
- step flashing
- counter flashing
- drip edge flashing
- valley flashing
Example sentences
- "Water stains on the attic rafter revealed that the aluminum flashing around the chimney had corroded." Roofing inspection report
- "Properly installed step flashing directs heavy rain away from the vulnerable wall junction." Exterior construction manual
Memory hook
A FLASH of shiny metal protecting the roof seam from splashing water. Metal seam shield.
When not to use
Do not confuse with emitting sudden bright light or making a quick visual display.
Fun facts
- Copper flashing can easily last over 100 years, developing a striking green patina called verdigris that actually protects the copper underneath from further corrosion.
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