Colorbond steel is a favourite pressure-clean Australian homes and commercial buildings because of its durability, visual appeal and low maintenance. But over time even the most hardy roofing materials like Colorbond can collect airborne dirt, natural debris, salt spray and even black algae growths. So can you pressure clean Colorbond?
Let’s go through the correct process, common mistakes to avoid and why professional roof cleaning services might be the best option for keeping your roof’s aesthetic appeal and roof warranty.
The Importance of Colorbond Roof Cleaning
Colorbond roof cleaning is not just about curb appeal – it’s a form of regular maintenance that extends your roof’s lifespan. Over time roof panels can collect lichen growths, spore deposits and rust stains from advanced rust or industrial fallout. Left untreated these can weaken the paint coating, especially in areas with harsh elements like strong winds, acid rain and marine salt.
Keeping a clean roof also reduces the risk of potential damage from moisture buildup and keeps your steel roof in top condition for a longer period.
Is It Safe?
Pressure cleaning roofs, especially Colorbond, must be done with proper equipment, adequate safety and the highest pressure required. Using an unregulated high-pressure washer or abrasive cleaning tools like wire brushes, steel wool or paint removers can strip away the protective paint finish and lead to costly roofing repairs.
Instead opt for a pressure cleaner with medium pressure, and gentle cleaning methods like a soft-bristled brush, mild non-abrasive kitchen detergent and clean water or a mild solution.
Proper Pressure Cleaning Technique
Whether you’re dealing with rust stains, grease oil, black patches, or just general airborne dirt, here’s how to clean your Colorbond roof or fence safely.
1. Clear Loose Debris
Use a soft-bristled brush, non-abrasive cleaning pad, or soft bristle nylon brush to sweep away dead growths, lichen growths, natural debris, and dirt from the steel surface.
2. Use a Pressure Cleaner on Medium Pressure
Set your pressure washer to medium pressure (1000–1500 PSI). This will give you a strong but gentle cleaning solution that won’t harm your paint finish or pre-painted steel.
Don’t use turbo nozzles or needle jets—these will strip off the protective layer.
3. Use Cold or Warm Water Only
Don’t use hot water or acid with water. Plain water, clean water, or a mild detergent solution is best. You can mix a bucket of water with a mild non-abrasive kitchen detergent (check the detergent label to avoid solvent type cleaners).
4. For Tough Stains or Growths
Use a mild solution of water and outdoor cleaners, laundry detergent, or specialised fence cleaners. Let it sit for a bit before scrubbing with a soft cloth or brush. Never use abrasive cleaners, paint removers, or muriatic acid.
5. Rinse Thoroughly
Make sure no detergent is left behind. Use gentle spray patterns to rinse downwards, especially on steep roofs.
Common Mistakes to Avoid
- Using abrasive cleaners or tools like steel wool or abrasive cleaning tools
- Walking on steep roofs or without proper safety gear and protective clothing
- Using too much pressure or wrong spray patterns
- Not following safety precautions like eye protection and mouth protection
- Leaving detergent or cleaning products on the steel results in paint peeling, black patches, or void of the roof warranty.
Pro Tip
For tough stains or lichen growth, mix a mild detergent and apply with a soft bristle nylon brush. Rinse with clean water and let the roof air dry. Don’t use acid with water mixtures or paint thinners unless instructed by your roofing agent. Touch up damaged paint with touch-up paint designed for Colorbond steel and follow proper curing process.
DIY vs Professional Services
A DIY job may seem like a cost-effective option but if done incorrectly can result in roof damage, paint system failures or voided warranties. A professional team:
- Uses the minimal pressure required
- Knows how to handle tougher stains and black algae growths
- Follows safety protocols
- Delivers long-lasting cost-effective results
- Has access to pressure washing equipment from a genuine equipment shop
Leave It to the Experts
Cleaning your roof—especially a metal roof—can be dangerous and tricky. A professional roofing company with an experienced team ensures your roof surface is cleaned using safe, approved methods, with colour roof damage and no damage to the paint system.
For homeowners wanting to keep their roofs in top shape, our Colorbond roof cleaning Melbourne services have the with expertise for local conditions and Australian harsh weather.
FAQ
Can I use laundry detergent to clean a Colorbond roof?
Only if it’s a mild non-abrasive detergent. Check the detergent label to make sure it’s safe for steel roofing and won’t damage the paint finish.
Will a pressure washer remove stubborn dirt and rust pieces?
Yes, but may require a gentle cleaning solution or soft washing to lift stubborn non-water elements like grease oil or dead growths.
What’s the best way to maintain the visual appeal of my roof over time?
Create a roof cleaning schedule, remove loose debris regularly and have professional services handle tougher jobs to maintain visual appeal and curb appeal.
Should I use chemical washing for colour bond roofs?
Avoid chemical washing with acidic products. Use mild detergent solutions and contact a professional roofer for the right cleaning.
Keith Scott