Roof Cleaning in St. Louis, MO

Roof Cleaning Services Across the St. Louis Metro

Those black streaks aren't dirt. They're a living organism -- gloeocapsa magma, an algae that feeds on the limestone filler in asphalt shingles. It spreads fastest in humid, shaded conditions, which makes St. Louis summers close to ideal for it.

Left alone, it doesn't stay cosmetic. It holds moisture against the roof surface and speeds up wear on the shingles underneath. Moss can show up too, usually in shaded, damp sections where sunlight rarely hits.

Homeowners and businesses across the metro trust us for the same reason: we get rid of it correctly, without the risks that come from pressure washing a roof.

What Happens During a Roof Cleaning Visit

We start with an assessment. Every roof is different, and the cleaning approach depends on the roofing material, the slope, and how far the staining has progressed. We walk the property first and look at what's actually growing up there before we touch anything.

Before any solution goes on the roof, we protect what's around it. Landscaping, plants, and grass near the drip line get rinsed and covered as needed, so nothing below the roofline takes damage. This step matters as much as the cleaning itself -- a roof that comes out spotless isn't a win if the flower beds underneath took the fallout.

Then we apply our cleaning solution at low pressure. It's designed to do the work chemically, not through force. The solution needs dwell time to break down algae, mold, and moss at the root -- so we let it sit before rinsing, rather than rushing straight to a rinse-and-go.

You'll see streaks start lifting during the rinse. The full result keeps improving over the following days as the solution finishes working underneath the surface. That's normal, and it's part of how a proper soft wash performs versus a quick pressure rinse that only blasts the surface clean for a few weeks before staining returns.

We photograph the roof before we start and after we finish. That way you're not just taking our word for the condition -- you're seeing it.

Roof Types We Clean

Different roofing materials hold staining differently, and they all respond well to a soft wash approach when it's done right.

Asphalt shingle is the most common roof type we clean across the metro, and the one most affected by gloeocapsa magma streaking. The granules on a shingle roof are exactly what pressure washing strips away, which is why soft washing is the only method we'll use on one.

Tile roofs get the same soft wash treatment -- low pressure keeps the glazed surface intact while removing the algae and organic buildup underneath. Tile holds staining differently than shingle, but the same low-pressure, biodegradable approach handles it without cracking or chipping tiles in the process.

Slate roofs need a careful touch given their age and value, and soft washing is the only method we'd use on one. We've cleaned some of the oldest slate roofs in the metro, and a roof that old deserves a process that won't shorten what's left of its life.

We also clean commercial flat and TPO roofing for property managers and business owners across St. Louis. Flat roofs collect standing organic growth differently than a sloped shingle roof, and soft washing clears it without compromising the membrane. For multi-building properties, we can walk the whole portfolio on one visit and give you a straight read on which roofs need attention now and which can wait.

We do not offer roof cleaning on metal roofing at this time.

When to Clean Your Roof -- Reading the Stains

Staining follows a pattern, and catching it early makes the job easier.

It usually starts as a light gray haze, easy to miss from the ground. Left alone, that haze develops into visible black streaking -- the gloeocapsa magma most homeowners actually notice and call about.

If it goes untreated long enough, heavier moss and algae patches can build up in shaded, damp areas of the roof. At that stage, the growth is harder to remove and has usually caused more wear underneath. Want the full breakdown of what those streaks are and why they spread? Read our black streaks on roof guide.

Why Soft Washing Is the Right Method for Roofs

Soft washing uses low pressure and an EPA-compliant, biodegradable cleaning solution to kill algae, mold, and moss at the root -- safe for shingles, tile, and slate alike. We never pressure wash a roof, because high-pressure water strips granules and shortens the life of the material it's meant to protect.

Want the full explanation of how the process works? See our soft washing page for the method in detail.

Backed by Our 5-Year Spot-Free Warranty

Every roof cleaning job is backed by our 5-Year Spot-Free Warranty. Read the full details, including why pressure washing can void a manufacturer's roofing warranty, on our Kirkwood roof cleaning page.

Why St. Louis Homeowners and Businesses Trust Maverick Softwash

A roof is the one part of your property you can't get up close to and check yourself. That's the whole reason this job exists -- we're the eyes you don't have.

We tell you exactly what we find during the assessment, no exaggerating the problem to sell a bigger job you don't need. We document the work with photos, so you can see the actual condition before and after, not just take our word for it. If a section is fine, we say it's fine.

Maverick Softwash has decades of experience cleaning exteriors across St. Louis, and every job is fully insured. Soft washed results last three to five times longer than a pressure wash, because the treatment kills growth at the root instead of just knocking it off the surface for a season.

Whether it's a single-family shingle roof or a commercial TPO portfolio, the standard doesn't change -- honest reporting, careful protection of what's around the roof, and a soft wash that actually solves the problem instead of masking it for a few weeks.

Ready to see what's actually happening on your roof? A Maverick Softwash assessment gets you an honest answer -- not a guess from the driveway.