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Your roof is one of the most important—and expensive—parts of your home. Over time, Wisconsin roofs develop black streaks, moss, algae, and lichen that not only make a home look older but can also shorten the life of the shingles. A professional roof wash is one of the best investments you can make to protect your home and maintain curb appeal.
Homeowners throughout Appleton, Neenah, Menasha, Kaukauna, and Fox Crossing often ask when and why roof washing is needed. The answer is simple: regular cleaning keeps your roof healthy, saves money, and prevents major long-term damage.
What Causes Black Streaks and Roof Stains?
The dark streaks you see on roofs across Wisconsin come from a bacteria called Gloeocapsa Magma. This organism feeds on the limestone filler in asphalt shingles, slowly breaking them down. Moist, shaded areas are especially vulnerable, and the issue spreads from roof to roof—just like algae on siding.
- Algae: Causes black or dark green streaks.
- Moss: Creates thick, spongy growth that holds moisture.
- Lichen: Hard, crusty spots that dig into shingle surfaces.
None of these issues will go away on their own, and they worsen each year if ignored.
Why Roof Washing Is Important
1. Extends Roof Life
Algae and moss slowly damage the granules that protect shingles. A professional soft wash removes organic growth safely and prevents premature aging.
2. Prevents Water Damage
Moss and lichen hold moisture, which can cause shingles to separate, curl, or crack. A clean roof sheds water properly and reduces leak risk.
3. Improves Curb Appeal
A roof covered in black streaks makes the entire home look older. A soft wash instantly brightens the roof and restores a clean, well-maintained appearance.
4. Increases Energy Efficiency
Dark organic growth absorbs heat. Removing algae helps the roof reflect sunlight the way it was designed, keeping attic temperatures more stable.
5. Protects Home Value
Buyers often assume roof stains mean expensive repairs. A clean roof improves appraisals and keeps your home looking cared for.
Soft Washing: The Only Safe Method for Roof Cleaning
Pressure washing should never be used on a roof. High pressure can remove granules and damage shingles instantly. Instead, professional roof cleaners use a soft wash system—a low-pressure application of cleaning detergents designed specifically for roofing materials.
At Timler Exterior Services, our soft wash roof cleaning:
- Kills algae, moss, and lichen at the root
- Restores your roof’s original color
- Protects the granule layer on asphalt shingles
- Prevents future growth for years
- Is recommended by shingle manufacturers
How Often Should You Have Your Roof Washed?
In Wisconsin’s climate, most roofs should be professionally cleaned every 3–5 years, depending on shade, tree coverage, and moisture exposure.
Signs you need a roof wash:
- Visible black streaks or discoloration
- Moss or lichen patches
- Shingles look older than they are
- You’re preparing to sell your home
Protect Your Roof and Boost Curb Appeal
A soft wash not only cleans your roof—it protects your investment. If you want your home to look its best and avoid costly repairs, scheduling a professional roof wash is one of the smartest maintenance decisions you can make.
See before-and-after photos and customer reviews on our Google Business Profile.
Timler Exterior Services — Roof Washing & Soft Washing in Appleton, Neenah, Menasha, Fox Crossing, Kaukauna, and surrounding Fox Valley communities.