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Roof Flashing Leaks
in Raleigh, NC
Raleigh gets an average of 46 inches of rain per year across every season. That puts constant stress on flashing at chimneys, skylights, pipe boots, and roof-to-wall joints. Flashing is the thin metal layer that seals those joints. Raleigh's clay-heavy soil shifts over time and cracks that metal apart. Ignored flashing failures are a leading cause of hidden attic rot and ceiling damage all across Wake County.
Quick Answer
Flashing is the thin metal that keeps water out around your chimney, skylights, and pipes. Raleigh's soil shifts and moves, and that bends and cracks the metal until water gets in. A roofer pulls the old flashing and installs new metal sealed properly to the roof. Call (984) 500-1173 if you see water stains near any of those spots.
Telltale Signs
Warning Signs to Watch For
- Water stains on ceilings or walls near a chimney, skylight, or dormer
- Rust streaks running down brick chimneys or exterior walls below roof transitions
- Visible gaps, lifted edges, or separated sections in metal flashing strips
- Cracked, dried, or missing caulk around pipe boots and vent collars
- Mold or mildew odor in the attic near roof penetrations
- Bubbling or peeling paint on interior walls directly below roof-to-wall joints
Root Causes
What Causes Roof Flashing Leaks?
Chimney Flashing Separation
Raleigh's red clay soil expands when wet and shrinks when dry. That movement makes the chimney footing shift at a different rate than the wood roof around it. Step flashing gets pulled apart at the mortar joints. Step flashing is the metal pieces woven between the chimney and the shingles. Those open seams send even moderate rain straight into the attic framing.
The Fix
Chimney Flashing Replacement and Repointing
Old flashing comes off and deteriorated mortar joints get repointed. New two-piece step-and-counter flashing goes in using reglet cuts and sealant rated for Raleigh's temperature swing between 20°F winters and 100°F summers.
Pipe Boot and Collar Failure
The rubber collar on a pipe boot seals the gap where a plumbing vent pokes through the roof. A pipe boot is the metal-and-rubber fitting that fits around that pipe. Raleigh's intense summer UV and winter freeze-thaw cycles crack the neoprene collar within 10 to 15 years on most homes. Once it splits, every rain event sends water down the outside of the pipe and under the shingles.
The Fix
Pipe Boot Replacement
The failed rubber boot comes off and a new pipe boot goes in with a reinforced silicone collar instead of neoprene. It gets slipped under the upslope shingles and over the downslope shingles so water sheds off correctly.
Roof-to-Wall Flashing Failure
Many Raleigh homes built from the 1970s through the 1990s used caulk-only flashing details at dormers and additions. Those details were allowed under older NC codes but are now known to fail within 15 to 20 years. Humid summers make the wood framing behind those joints expand and dry out repeatedly until the caulk bond breaks and water gets into the wall.
The Fix
Kickout and Step Flashing Installation
Siding comes off at the roof-to-wall joint and real step flashing gets woven between each shingle course. A kickout diverter goes in at the base of the joint. Counter flashing or integrated siding returns finish the detail to meet current NC Residential Code requirements.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Chimney Flashing Separation | Pipe Boot and Collar Failure | Roof-to-Wall Flashing Failure |
|---|---|---|---|
| Water stain appears on ceiling directly below or adjacent to chimney | |||
| Ceiling stain located in a room with no overhead penetration but near a plumbing vent | |||
| Rust or efflorescence streaking down exterior brick near chimney base | |||
| Water intrusion at interior wall below a dormer or addition roofline | |||
| Cracked or split rubber collar visible on plumbing vent pipe on roof | |||
| Peeling paint or rot discovered behind siding at a roof-to-wall junction |
Free Inspection
Get a Diagnosis in Raleigh
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
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