The Summer Streaks: What Those Black Roof Marks Really Mean
Have you glanced up at your roof lately and noticed long, black streaks running down the shingles? If you thought it was just dirt or shadows, think again. Those unsightly streaks are actually algae growth—and while they may start as a cosmetic issue, they can lead to serious roof problems if left untreated.
Why Black Streaks Appear on Roofs
The black stains you see are caused by a type of algae called Gloeocapsa magma. This airborne algae travels from house to house, carried by wind and birds, and thrives in humid conditions like the summers we get in Indiana and Ohio.
It tends to appear more on north-facing slopes because they stay damp longer and get less direct sunlight. Over time, this algae doesn’t just make your roof look old—it can:
Eat away at your shingles by feeding on the limestone filler in asphalt
Trap heat, raising your home’s energy bills
Reduce your roof’s lifespan by accelerating wear
In some cases, moss and lichen will start to grow on top of the algae, making the problem worse. Moss retains water, which leads to rot and shingle lifting.
The Hidden Costs of Ignoring Roof Algae
A roof covered in black streaks isn’t just an eyesore—it can cost you money. Homes with visibly dirty roofs often see:
Lower property value and curb appeal
Increased risk of leaks as shingles deteriorate
Higher long-term repair costs due to early roof replacement
If you’re thinking of selling your home, a streaky roof is one of the first things potential buyers notice. Even if you’re staying put, ignoring the problem allows algae to spread and damage your investment.
How TLC: Making It Easy Can Help
The good news is that black streaks don’t mean your roof is ruined—they just need the right cleaning process. TLC: Making It Easy uses a professional, soft-wash roof cleaning method that:
Removes harmful algae and moss without damaging shingles
Restores the original color and appearance of your roof
Extends the lifespan of your shingles
Unlike DIY pressure washing, which can strip protective granules from shingles, our method is safe, effective, and long-lasting.
We provide roof cleaning services across Fort Wayne, Bluffton, Decatur, Van Wert, and Berne, helping local homeowners protect their roofs and boost curb appeal.
Schedule Your Roof Cleaning Before It Gets Worse
If you see black streaks on your roof, now is the time to act—before summer storms and humidity allow algae to spread even further. A professional roof cleaning is a small investment that can prevent costly repairs down the road.
✅ Contact TLC: Making It Easy today to schedule your roof washing and enjoy a clean, healthy roof all summer long.