Roof Flashing
Thin metal pieces installed at roof joints, valleys, chimneys, and walls to direct water away from seams and penetrations.
Quick answer
Roof Flashing: Thin metal pieces installed at roof joints, valleys, chimneys, and walls to direct water away from seams and penetrations. Typical cost: $15–$30 per linear foot; $300–$1,500 added to a reroof..
Why it matters
Most roof leaks aren't shingle failures — they're flashing failures. Replacing flashing during reroofs is the cheapest leak insurance available.
Typical cost
$15–$30 per linear foot; $300–$1,500 added to a reroof.
Pros
- • Prevents the majority of roof leaks
- • Lasts 20–40 years if galvanized or aluminum
Cons
- • Often reused (and shouldn't be) on budget reroofs
- • Corrodes if dissimilar metals contact
Common uses
- • Chimneys, valleys, skylights, wall intersections, vent pipes
Alternatives
Self-adhered membrane (limited applications)
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Frequently asked questions
- Should flashing be replaced during a reroof?
- Yes — always replace chimney and valley flashing on a reroof; reusing it is the #1 source of post-reroof leaks.
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