The Most Common Roof Leaks in New Jersey — Causes, Warning Signs, and Fixes

New Jersey homeowners deal with some of the toughest roofing conditions in the country: heavy rain, Nor’easters, humidity, snow, ice dams, and strong coastal winds. That’s why roof leaks are one of the most frequent service calls.
Understanding where leaks come from — and how to fix them correctly — can save thousands in water damage repairs.

1. Chimney Flashing Leaks

Chimneys are one of the biggest leak points on NJ roofs. Cracked mortar, loose step flashing, and old counter-flashing allow water to enter behind the shingles.
Warning Signs:

• Stains on ceilings near the chimney
• Damp attic insulation
• Crumbling brick or mortar
  Fix: Replace step & counter flashing with sealed metal flashing.

2. Pipe Boot & Vent Leaks

Pipe boots (rubber seals around plumbing vents) dry out in the sun and crack after 8–12 years.
Warning Signs:

• Drips around bathroom ceilings
• Water marks near vent pipes
  Fix: Replace the boot — not the whole roof.

3. Skylight Leaks

Older skylights or poorly installed ones are a major leak source.
Warning Signs:

• Fogging between panes
• Dripping when snow melts
• Dark stains on surrounding drywall
  Fix: Re-flash the skylight or replace old units entirely.

4. Valley Leaks

Roof valleys collect massive water flow. NJ storms push debris into them, causing water to back up.
Warning Signs:

• Leaks during heavy rain
• Shingle wear in the valley
• Moss or debris buildup
  Fix: Install reinforced ice & water shield and valley metal (W-style or open valley).

5. Ice Dam Leaks in Winter

Ice dams trap melted water and push it under shingles — one of NJ’s most destructive winter issues.
Warning Signs:

• Leaks only during snowmelt
• Icicles hanging from gutters
• Cold spots in attic
  Fix: Improve insulation & ventilation, add ice & water shield, and address attic heat loss.

6. Roof-to-Wall Flashing Failure

Where a roof meets a wall (sidewall or dormer), flashing failure is common.
Warning Signs:

• Water streaks down interior walls
• Damp siding
• Rotting trim
  Fix: Remove siding, install proper step flashing and counter flashing.

7. Old Shingles at End-of-Life

Many NJ roofs fail simply because shingles have aged out.
Warning Signs:

• Cracked or curled shingles
• Granule loss
• Multiple leak points
  Fix: A full replacement is usually the best long-term solution.

How Sweet Home Construction Fixes Leaks the Right Way

Our repair process includes:

• Full attic inspection
• Drone photography
• Moisture detection
• Flashing and shingle assessment
• Written repair plan
  We fix leaks at the source — not with temporary band-aids.