If your roof is streaked with black stains and green growth, you’re not alone. In our heat and humidity, roofs in Baton Rouge grow algae and mildew fast. But before you blast it clean, it’s worth knowing the difference between soft washing and pressure washing your roof in Baton Rouge — because one of them can wreck your shingles.
What those black streaks actually are
Those dark stains aren’t dirt. They’re a type of algae that feeds on the limestone in asphalt shingles, and our Gulf Coast humidity is the perfect home for it. Left alone, it spreads and can shorten the life of your roof. The green fuzzy patches are usually mildew or moss holding moisture against the surface.
Why high pressure is the wrong tool for a roof
A pressure washer forces water at high PSI. On a driveway, that’s great — it’s how we handle jobs like driveway cleaning. On a roof, that same force strips the protective granules off asphalt shingles, forces water up under them, and can void your shingle warranty. You might get a clean roof today and a leaking, aging one next year.
What soft washing is
Soft washing uses low pressure — closer to a garden hose — with a cleaning solution that actually kills the algae and mildew at the root. It rinses clean without tearing up the shingles, and because it kills the growth instead of just knocking it loose, the roof stays clean longer. For almost every shingle roof around here, soft washing is the safe choice.
When to call a pro
Roof work is a fall-hazard job, and mixing cleaning solutions on a steep, slick surface isn’t a DIY afternoon for most homeowners. A pro brings the right low-pressure setup, protects your landscaping from runoff, and knows how to treat the roof without damaging it. If you’re seeing streaks from the street, it’s time.
Get a free quote
Red Stick soft-washes roofs and handles exterior cleaning across Baton Rouge and the surrounding areas — Prairieville, Zachary, Denham Springs, Gonzales, and Central. We’re licensed and insured, and we’ll use the right method for your roof, not just the strongest one. Request a free, no-pressure quote and we’ll get those streaks gone the safe way.