What Is Roof Flashing?
Flashing is a thin, waterproof metal barrier installed at roof joints and penetrations to direct water away from vulnerable areas:
Types of Roof Flashing
Different flashing types serve different purposes:
Signs of Flashing Failure
Watch for these warning signs of flashing problems:
Flashing Repair and Replacement
When flashing fails, it needs to be repaired or replaced:
Preventing Flashing Problems
Proper maintenance helps prevent flashing failures:
Frequently Asked Questions
What is roof flashing and what does it do?
Roof flashing is thin metal installed at roof joints and penetrations to direct water away from vulnerable areas. It prevents leaks at chimneys, vents, walls, valleys, and eaves by creating a watertight barrier.
How often does flashing need to be replaced?
Flashing lasts 20-30 years with proper installation. Copper flashing can last 50+ years. Replace flashing when it shows rust, cracks, holes, or when sealant has failed. Annual inspections help catch problems early.
Can I repair flashing myself?
Minor sealant repairs can sometimes be DIY, but flashing work requires climbing on the roof and working with metal. Most flashing repairs should be done by a professional to ensure proper installation and watertight seals.
How much does flashing repair cost?
Minor flashing repairs cost $200-$600. Section replacement costs $400-$1,200. Full flashing replacement costs $800-$2,500 depending on the extent of damage and materials used.