Aluminum (also spelled aluminium) is usually the easier eavestrough to clean and maintain, while steel is tougher against dents but less forgiving about rust. This comparison shows what each metal asks of you, how to clean it safely and how to tell which one you have.
In This Article
The short answer, and why it is not the whole story
Aluminum is very common on Ontario houses. It is light, does not rust and needs little more than regular clearing. Steel, whether galvanized or painted, is stiffer and harder to dent, but its coating is what protects it. Once the coating is scratched or wet debris sits on it for months, rust starts.
So the cleaning job itself is nearly identical. The difference is in the aftercare: what a scratch means, what standing water does and how careful you must be with tools.
What each metal asks of you
| Feature | Aluminum | Steel |
|---|---|---|
| Rust | None. It forms a thin pale oxide film that stays cosmetic | Yes, once the coating breaks at scratches, cut edges, seams or fasteners |
| Dents | Soft, so ladders, ice and branches leave dents | Stiffer and more resistant to ladder pressure |
| Weight | Light, so easy on hangers and fascia | Heavier, so a clogged run puts more load on the fasteners |
| Scratches from tools | Cosmetic | A future rust spot unless touched up |
| Standing water | Harmless to the metal, though it feeds debris and seedlings | Speeds up rust wherever water sits |
| Paint and finish | Can chalk or fade over years | Can chip, then rust through the chip |
| Rust stains on siding | Not from the trough | Possible below seams and fasteners |
The pattern is that aluminum forgives, and steel demands attention. If the slope is good and debris never sits, steel can last well. If the slope is off and the muck stays wet, rust wins.
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Cleaning each metal without harming it
Aluminum
- Use a plastic scoop and gloved hands. A metal trowel scratches the paint, and a scratch invites oxidation.
- Lean the ladder on a standoff, never on the trough. The metal is soft and the lip creases.
- Wash the outside with a cleaner made for painted aluminum, following the label, and rinse it well. Harsh acidic or alkaline cleaners can etch the finish.
- For dark streaks, read black streaks on gutters before scrubbing.
Steel
- Use only plastic tools. Wire brushes and metal scrapers break the coating.
- Get every bit of wet debris out and make sure the trough dries. Sitting leaves are the usual start of rust.
- Check seams, screw heads and the bottom of the trough for orange spots each time you clean.
- Touch up scratches and chips promptly with a paint made for the metal, following its label. Treat any rust first.
Watch the fasteners on either metal. A rusting screw head stains the trough and the siding beneath it, and where a screw or hanger is a different metal from the trough, moisture can speed up corrosion where the two touch. Replace rusty fasteners with ones made for your trough's metal, and follow the manufacturer's guidance.
Build the checks into a routine. In spring and fall, look for dents, loose hangers and open seams on both metals. With steel, add a torch and a close look at the seams, the screw heads and the low points where water sits, because that is where orange spots show first.
Choose aluminum if, choose steel if
- Choose aluminum if you want the lowest-effort trough, heavy tree cover leaves debris sitting for weeks, or your fascia is older and cannot carry much weight.
- Choose steel if dents are your main worry, for example under ice-prone eaves or where ladders are used often. Accept a firmer maintenance routine and a watch for rust.
Vinyl and copper are other options, with their own trade-offs, and aluminum vs vinyl vs copper gutters in Ontario compares them. For most houses, the deciding factor is not the metal but the slope, the hangers and how often the trough is cleared.
Check what you have, then get help if you need it
Hold a fridge magnet against the trough. If it sticks, you have steel. If it slides off, you have aluminum or another non-magnetic metal. Look for orange or brown marks around seams, screws and the low points, which point to steel that has already started to rust.
D&D Home Services offers gutter cleaning from $125 for a typical Kitchener-Waterloo home, with free written quotes before work begins. Tell the crew which metal you have, and mention any rust spots you noticed.
Key Takeaways
- Aluminum is usually easier to look after because it does not rust, though it dents more easily under ladders and ice.
- Steel resists dents but rusts where the coating breaks, so use plastic tools, remove wet debris fully and touch up scratches.
- Lean ladders on a standoff for either metal, and use only cleaners suited to the finish, following the label.
- A magnet sticks to steel and slides off aluminum, so test before you choose tools or products.
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