Roof Cleaning Milwaukee – Moss, Algae & Debris Removal
Those Black Streaks Aren't Just Ugly. They're Eating Your Roof.
Algae and moss don't just look bad. They actively destroy your shingles.
Holland Exteriors provides professional roof cleaning services in Milwaukee and surrounding areas. Safe removal of moss, algae, and debris that damages shingles and shortens roof life. Licensed, insured, BBB A+ rated. Call (414) 340-3890 for a free assessment.
The Roof That Died Early
Linda Patterson noticed black streaks on her roof in 2018. She thought it was just dirt. Cosmetic. Nothing serious.
By 2020, the streaks had spread. The north side of her roof was dark. Green patches appeared. Moss started growing in the valleys.
By 2022, her 12-year-old roof needed full replacement.
The manufacturer rated those shingles for 30 years. Linda got 12. Because algae and moss don't just sit on your roof. They actively break down the protective granules on your shingles. They hold moisture against the roof surface. They lift shingle edges. They rot.
Professional roof cleaning in 2018 would have cost $400. Linda paid $19,000 for a new roof instead. Because she didn't know those black streaks were alive and eating her investment.
What We Remove From Your Roof
Gloeocapsa Magma (Black Algae)
Those black streaks are cyanobacteria that feed on limestone filler in shingles. They retain moisture and accelerate roof aging.
Moss Growth
Moss grows in shaded areas, lifts shingles, holds water, and causes rot. Common on north-facing slopes in Milwaukee.
Lichen
Harder to remove than moss. Sends roots into shingles. Requires professional treatment to eliminate without damage.
Organic Debris
Leaves, twigs, seed pods. They trap moisture, clog valleys, and create perfect conditions for algae and moss.
Tree Sap & Pollen
Sticky residue that attracts dirt, holds moisture, and provides nutrients for algae growth.
Mold & Mildew
Grows in consistently damp areas. Discolors shingles and indicates moisture problems that need addressing.
Why Pressure Washing Will Destroy Your Roof
Never Pressure Wash an Asphalt Shingle Roof
We've replaced dozens of roofs damaged by pressure washing. High-pressure water strips the protective granules off your shingles. It voids your warranty. It can reduce your roof's lifespan by 10+ years.
We use low-pressure soft washing with EPA-approved biodegradable solutions. It kills algae and moss without damaging your shingles. This is the method recommended by every major shingle manufacturer.
Our Safe Roof Cleaning Process
Roof Inspection
We inspect before cleaning. Check for damage. Identify problem areas. Make sure your roof is in condition to be cleaned safely.
Soft Wash Treatment
Low-pressure application of cleaning solution. Kills algae, moss, and lichen at the roots. Gentle on shingles. Effective on growth.
Debris Removal
Clear gutters, valleys, and roof surface. Remove leaves, branches, and organic material that holds moisture.
Preventive Treatment
Optional zinc or copper strips that prevent future algae growth. Protects your investment for years.
When Should You Clean Your Roof?
- When You See Black Streaks
Don't wait for them to spread. Clean early before algae damages your shingles
- When Moss Appears
Moss lifts shingles and causes leaks. Remove it as soon as you notice growth
- Every 3-5 Years Preventively
Even if your roof looks clean, preventive cleaning extends its life and maintains appearance
Stop Algae and Moss Before They Destroy Your Roof
Professional soft washing. Safe for your roof. Tough on growth. Protect your investment today.
Call for Free Estimate: (414) 340-3890