Blog / September 4, 2026

Roof Flashing Checks for Wylie & DFW: The Smallest Leak Source That Causes the Biggest Stains

Most North Texas roof leaks start at flashing — the metal seals where roof planes meet walls, chimneys, and vents. A short, ground-level-friendly flashing checklist for Wylie and DFW homeowners to run before fall storms.

1) Start with the chimney base

• Look for lifted or bent flashing along the chimney shoulders.
• Note any rust streaks or dark staining on the bricks below.
• Check the seal at the counter-flashing line for visible gaps.

2) Wall-to-roof transitions

• Inspect the metal where a roof slope meets a second-story wall.
• Step flashing should overlap each shingle course — gaps here are a common DFW leak source.
• Look for sealant that has cracked or pulled away from the wall.

3) Valleys and dead valleys

• Confirm the valley metal is intact and not pinched or rusted through.
• Clear leaves and debris — backed-up valleys push water under shingles during heavy rain.

4) Vent pipe and HVAC boots

• Look for cracked rubber boots around plumbing vents (a common 7–10 year failure point).
• Check HVAC and furnace vent caps for secure attachment and intact seams.

5) Attic-side confirmation

• After a rain, look for dark staining on decking near chimney and vent penetrations.
• Daylight visible around a penetration usually means the flashing needs attention.

When to call a pro

• You see lifted, rusted, or missing flashing from the ground.
• Ceiling stains reappear after every rain near a chimney or wall.
• Your roof is 10+ years old and has never had a flashing inspection.