If your roof is leaking, there’s roughly a 40% chance the source is flashing — not the shingles themselves.
What Flashing Is
Flashing is thin metal installed at any point where the roof surface meets a different surface or angle:
- Step flashing: Where roof meets a vertical wall (dormers, additions)
- Counter flashing: Upper piece at chimney bases
- Valley flashing: At intersection of two roof planes
- Pipe boot flashing: Around plumbing vent penetrations
- Drip edge: At roof edges to direct water into gutters
Why Georgia Is Especially Hard on Flashing
Atlanta’s climate creates extreme thermal cycling — from below freezing in winter to 95°F+ in summer. Metal expands and contracts with every temperature change. Over thousands of cycles, sealants fail, fasteners loosen, and metal fatigues. Rubber components — pipe boots, HVAC seals — degrade faster in Georgia’s heat, typically failing at 10-15 years vs. 20 years in northern climates.
Signs of Flashing Failure
- Water stains on interior walls near chimneys or dormers
- Ceiling stains in rooms adjacent to roof-wall intersections
- Visible rust or corrosion on metal components
- Separated or cracked caulk around penetrations
- Lifted metal from the roof surface
Repair Costs in Atlanta
| Repair Type | Typical Cost | |————-|————-| | Pipe boot replacement | $150-$250 | | Step flashing section repair | $200-$400 | | Chimney counter flashing | $350-$700 | | Valley flashing repair | $300-$600 | | Full chimney flashing replacement | $500-$1,200 |
When Flashing Repair Isn’t Enough
If surrounding shingles in the flashing zone are also aging or damaged, repairing just the flashing may result in additional leaks nearby. An honest roofer will tell you when broader repair or replacement makes more financial sense than patching.
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