Rust on a metal roof: what it means
Some discolouration on metal roofs is cosmetic, but rust that has eaten through the sheet lets water in. The location and extent of rust help decide whether treatment or replacement is needed.
Safety classification
Safe inspection only
This guide covers safe first actions only. It is not a licence to perform regulated work or enter a dangerous area.
What to do
- 1
Look from the ground
Use binoculars to check for orange-brown patches, especially around screws, overlaps, gutters and flashings.
- 2
Check inside the roof space if safe
Only if you can enter safely: look for light showing through or water tracks. Stay on the framing and keep away from wiring.
- 3
Note the pattern
Rust around screws often means washers have failed. Rust near the coast or under trees may be more widespread.
- 4
Keep gutters clear
Leaf litter that holds moisture against metal speeds up rust.
- 5
Book a roofer
Surface rust can often be treated and coated; rust-through usually means replacing affected sheets.
When to stop
- Light or water is coming through
- Rust has made holes in the sheets
- The roof space has damp or mould
- You would need to walk on the roof
Roofing
Prepare the problem, safety status and location once. The matching category will be pre-filled.
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