Signs Your Roof Flashings Need Replacing – And What to Do About It?

Roof flashings are a small but critical component in any roofing system. Positioned around chimneys, skylights, vents, and roof joints, they form a waterproof barrier that protects your property from leaks. Over time, however, even well-installed roof flashings can deteriorate—leading to moisture damage, structural issues, and costly repairs if left unchecked.

Visible Rust or Corrosion

One of the first and most obvious signs your flashings may need replacing is the appearance of rust or corrosion.

This is particularly common in older properties or in coastal areas where salt air accelerates metal breakdown. Rust weakens the flashing’s protective seal, increasing the risk of water infiltration during rain.

Cracks, Warping or Lifting

Flashings are designed to stay tight against the roof, but harsh weather, temperature changes, or poor installation can cause them to crack or lift. Even slight movement can allow water to seep underneath, particularly in areas with frequent rainfall or strong winds.

If you spot any distortion or lifting at the flashing edges, it’s a clear signal that repairs—or full replacement—are needed.

Water Stains or Damp Patches Indoors

Leaks caused by failing flashings often appear inside your home as water stains on ceilings or walls. These stains may seem small at first, but they’re an early indicator of a larger problem beneath the surface.

Mould, mildew, or a musty odour can also suggest ongoing water ingress, which should be addressed promptly to prevent structural damage.

Loose or Missing Flashings After a Storm

Storms can loosen or completely remove sections of flashing, especially if they weren’t properly secured during installation.

After any extreme weather event, it’s worth checking your roof (or having a professional do it) to ensure all flashings are still in place and functioning as they should.

When to Act – And What You Can Do

If any of the above signs are present, don’t wait. Replacing damaged flashings quickly is far more cost-effective than dealing with water damage down the line. For minor repairs, pre-cut kits can work, but for long-term protection, consider upgrading to higher-grade roofing materials or seeking custom flashings to suit your roof profile.

Recognising the early warning signs of worn-out roof flashings can save you time, stress, and money. A proactive approach ensures your roof stays watertight and your property remains protected—whatever the weather.