If you’ve noticed green stains slowly spreading across the exterior of your home in Covington, you’re not alone. Many homeowners throughout St. Tammany Parish deal with the same issue every year.
This green discoloration is typically algae growth, and it thrives in the warm, humid environment found across southern Louisiana.
The good news is that it’s a very common issue — and it can be safely removed with professional exterior cleaning.
What Causes Green Algae on House Siding?
The green staining you see on siding is usually caused by airborne algae spores that settle on exterior surfaces.
When moisture and shade are present, the algae begin to grow and spread.
Homes in Covington are especially prone to this because of:
• High humidity levels
• Frequent rainfall
• Warm temperatures
• Shaded areas from trees
• Moisture that lingers on siding
These conditions create the perfect environment for algae to grow on siding, brick, and trim.
Why the North Side of Homes Gets the Most Algae
Many homeowners notice that algae tends to grow more heavily on certain sides of the house.
In most cases, the north-facing side of a home develops the most buildup because it receives less direct sunlight. Without sunlight to dry moisture quickly, surfaces remain damp longer, allowing algae to grow more easily.
Tree cover can also increase algae growth by creating shade and trapping moisture around the home.
Is Green Algae Harmful to Your Home?
In many cases, algae starts as a cosmetic issue. However, if it’s left untreated for long periods of time, it can contribute to other problems.
Algae can:
• Cause surfaces to appear older or poorly maintained
• Trap moisture against siding
• Encourage mold or mildew growth
• Spread across larger areas of the home
Routine cleaning helps prevent this buildup from becoming a larger issue over time.
The Safest Way to Remove Algae from Siding
Many homeowners assume they need to use high-pressure washing to remove algae. In reality, this can actually damage siding or force water behind exterior panels.
The recommended method for removing algae is soft washing.
Soft washing uses specialized cleaning solutions combined with low-pressure rinsing to safely eliminate algae, mold, and mildew at the source.
This method:
✔ Kills algae spores
✔ Removes stains and buildup
✔ Protects siding and paint
✔ Produces longer-lasting results
Because the algae are treated at the root, the results typically last much longer than basic pressure washing.
How Often Should Homes Be Washed in Covington?
Because of the climate in St. Tammany Parish, most homes benefit from professional house washing every 1–2 years.
Homes with heavy tree coverage or shaded areas may require cleaning more frequently.
Regular exterior cleaning keeps siding bright and prevents algae from spreading across large portions of the home.
Improve Curb Appeal with Professional House Washing
Green algae stains can make even beautiful homes appear dull and poorly maintained.
A professional house wash can instantly:
• Brighten the appearance of siding
• Remove algae, dirt, and mildew
• Restore curb appeal
• Make the home look newer and well maintained
Many homeowners are surprised by how dramatic the transformation can be.
Professional House Washing in Covington, LA
If your home is showing signs of algae buildup, professional cleaning can safely restore its appearance.
Wash Hawk Softwash proudly provides house washing services in Covington and throughout St. Tammany Parish.
Our goal is to help homeowners keep their properties looking clean, bright, and well maintained.
📞 Call today: (985) 869-0808
Or request a free estimate online to schedule a professional house wash.
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