Moss, lichen, and black algae streaks don't just look bad — they actively destroy your shingles. Our professional soft-wash roof cleaning Montana service eliminates these organisms at the root, extending your roof's life by years.
Those black streaks on your roof aren't just dirt — it's Gloeocapsa Magma algae. Moss holds moisture against shingles and physically lifts them. Both dramatically shorten your roof's lifespan.
Moss and lichen cause shingles to deteriorate 2–3x faster. Regular cleaning can add 5–10 years to your roof's life.
A new Montana roof costs $8,000–$20,000+. Roof cleaning at a fraction of that cost prevents premature replacement.
Black-streaked roofs dramatically lower your home's appearance and perceived value. Cleaning restores that original look.
High-pressure washing blasts away protective granules from asphalt shingles. Our soft-wash method is safe and effective.
Moss holds moisture that expands and contracts with Montana's freeze-thaw cycles, cracking and lifting shingles.
Our biodegradable cleaning solution is safe for your landscaping, gutters, and the environment.
We inspect the roof type, pitch, and extent of biological growth before recommending a treatment plan.
Our biodegradable soft-wash solution is applied at low pressure, penetrating and killing moss, algae, and lichen at the root.
We allow the solution to work, killing organisms completely — not just washing surface appearance away temporarily.
A gentle rinse flushes dead material away. No granule damage. Your shingles are intact and your roof is clean.
Roof cleaning pricing depends on your roof's square footage, pitch (steepness), and level of growth. All quotes are free and upfront.
Most common in Montana. Soft-wash is the safest and most effective method for asphalt shingles.
Soft-wash works beautifully on metal and tile roofs — removing algae and oxidation without surface damage.
Save when you combine roof cleaning with gutter cleaning — we're already up there!
We respond to all quote requests within 24 hours. No pressure, no obligation — just a fair, transparent estimate.
No — that's exactly why soft-washing was developed. Traditional pressure washing blasts away protective granules from asphalt shingles, voiding warranties and shortening life. Soft-washing uses low pressure and chemistry to kill organisms safely. Most shingle manufacturers actually require soft-washing for warranty compliance.
Our soft-wash treatment typically keeps roofs clean for 2–4 years. Montana's climate varies, so homes with more shade and moisture may see regrowth sooner. We can set up a recurring schedule to keep your roof protected year-round.
We take precautions to protect landscaping — wetting plants before and after treatment and rinsing thoroughly. Our biodegradable solutions are diluted for minimal environmental impact.
Yes! We regularly travel to Miles City, Glendive, Forsyth, and all of Eastern Montana for roof cleaning jobs. Travel is included in our quote.
406 Pressure Clean offers professional roof cleaning Montana including roof cleaning Billings MT, roof cleaning Miles City MT and roof cleaning Glendive MT. Our soft-wash roof cleaning removes moss, lichen, black algae streaks and gloeocapsa magma from asphalt shingles, metal roofs and tile roofs throughout Eastern Montana. Montana roof cleaning specialists serving Yellowstone, Custer, Dawson and Rosebud Counties.
Those black streaks on your roof are not dirt — they are a living organism called Gloeocapsa Magma, a type of algae that feeds on the limestone filler in asphalt shingles. Left untreated, this algae spreads across your entire roof, degrades shingle granules, reduces reflectivity and dramatically shortens the lifespan of your roof. In Montana, where roof replacement costs $8,000-$20,000 or more, professional roof cleaning is one of the smartest preventive maintenance investments a homeowner can make.
We use the ARMA (Asphalt Roofing Manufacturers Association) recommended soft wash method for roof cleaning — never high pressure. Pressure washing a roof is one of the fastest ways to destroy your shingles. It blasts off the protective granule coating that shields the asphalt layer from UV rays, instantly voiding most roofing warranties and causing premature aging. Our soft wash system uses a low-pressure application of cleaning solution that kills algae, moss, lichen and mold at the root. The roof rinses clean and stays cleaner longer because the biological growth is dead — not just cosmetically removed.
Montana roofs also accumulate moss in shaded areas, particularly on north-facing slopes. Moss is especially damaging because it holds moisture against the shingle surface, promotes rot in decking and rafters below, and in winter creates conditions for ice dams. Killing and removing moss through professional soft washing protects not just your shingles but the entire structural integrity of your roof system.
Roof cleaning in Montana typically runs $300-$600 for a standard residential roof depending on square footage, pitch and level of biological growth. When you compare this to the $8,000-$20,000 cost of roof replacement, professional cleaning every few years is a no-brainer investment. We provide free quotes — contact us and we'll assess your roof and give you a clear price.
We clean roofs throughout Eastern Montana including Billings, Miles City, Glendive, Forsyth, Sidney, Colstrip, Hardin and Laurel. We are fully insured for roof work and use safe, proven soft wash techniques that protect your shingles and roofing warranty.
Will roof cleaning void my shingle warranty? No — soft washing using the ARMA recommended method is safe for all asphalt shingles and preserves your warranty. High-pressure washing DOES void warranties, which is why we never use it.
How long do roof cleaning results last? Typically 3-5 years. We can apply a post-treatment solution that inhibits future algae and moss growth and extends results significantly.
Is the cleaning solution safe for landscaping? Yes — we pre-wet landscaping around the home and use biodegradable solutions. We take precautions to protect your plants, lawn and garden beds.
How do I know if my roof needs cleaning? Black streaks, green or brown discoloration, visible moss patches, or a roof that looks darker than it used to are all signs that biological growth is present and professional cleaning is needed.
Your roof is the single most important exterior surface on your home — and one of the most expensive to replace. The average roof replacement in Montana runs $8,000-$20,000 or more depending on size, pitch and material. Professional roof cleaning at a fraction of that cost every few years extends roof life significantly, maintains energy efficiency, and prevents the kind of structural damage that starts as a surface staining problem and ends as a $15,000 replacement.
The black streaking on Montana roofs is one of the most misunderstood home maintenance issues we encounter. Most homeowners see it as dirt or oxidation and assume it's cosmetic. It is not cosmetic. Those black streaks are Gloeocapsa Magma — a cyanobacteria that uses the limestone filler in asphalt shingles as food. As it spreads, it degrades the granule surface of the shingles, reduces reflectivity, traps heat, and accelerates shingle aging. A Montana roof with significant algae coverage can age 5-10 years faster than a clean roof of the same product and installation.
Pressure washing a roof is one of the fastest ways to destroy it. The granules on asphalt shingles are the protective armor of the shingle — they shield the asphalt base layer from UV radiation, provide fire resistance rating, and determine the shingle's surface texture. Pressure washing blasts these granules off the shingle surface, instantly voiding most roofing manufacturer warranties and causing the underlying asphalt layer to be directly exposed to the elements.
The correct method — the one recommended by the Asphalt Roofing Manufacturers Association — is soft washing. Our soft wash process applies a sodium hypochlorite based solution at low pressure to the roof surface. This solution kills algae, moss, lichen and mold at the biological level. The organisms die, detach from the shingle surface, and rinse away with the next rainfall or a low-pressure water rinse. Shingle granules are completely undamaged because no mechanical force was applied to the surface.
The ARMA soft wash method is also specified as acceptable in most asphalt shingle manufacturer warranties. Having your roof pressure washed — even professionally — typically voids these warranties. Soft washing does not. This distinction matters significantly if you ever need to make a warranty claim on prematurely failing shingles.
Moss is a particularly destructive roof problem in Montana, especially on north-facing slopes and in areas with tree coverage that keeps the roof surface damp. Unlike algae which grows flat on the shingle surface, moss grows upward in thick clumps and physically lifts shingle edges as it expands. This breaks the weatherproofing bond between shingles, allows water infiltration under the shingle layer, and in winter creates the perfect conditions for ice damming.
Moss removal requires careful chemical treatment followed by careful mechanical removal of the loosened moss clumps. You cannot just apply bleach solution to a moss-covered roof and expect the moss to wash away — it needs to die fully and be removed. We use appropriate moss removal technique that clears the roof surface completely without damaging shingles in the process.
Lichen is the most stubborn biological growth on roofs and the most damaging. Lichen is a symbiotic organism — part algae, part fungus — that attaches itself to the shingle surface with root-like structures called rhizines that penetrate into the shingle granule layer. Unlike algae and moss, lichen cannot simply be washed off. The chemical treatment process for lichen requires multiple applications and extended dwell time. Results often take several months to fully manifest as the lichen dies and naturally detaches from the shingle surface over subsequent rainfall cycles.
We set realistic expectations for lichen treatment — a single soft wash will begin the killing process, but full visible results take time as the dead lichen gradually detaches. Some stubborn lichen may require a follow-up treatment. We price lichen treatment transparently and explain the process and expected timeline upfront so there are no surprises.
Montana summers are hot and the sun is intense at our elevation. Dark algae and biological growth on a roof surface absorbs significantly more heat than a clean shingle surface, which is designed to reflect a portion of solar radiation. Studies have shown that algae-covered roofs can increase attic temperatures by 10-15°F compared to clean roofs. In a Montana summer, that's directly reflected in your air conditioning costs and the comfort of upper-story rooms. A clean roof is a more energy-efficient roof.
After completing a roof soft wash, we can apply zinc or copper sulfate-based strips or a liquid preventive treatment to the roof surface. These treatments slowly leach metal ions down the roof surface with each rainfall, creating an environment where algae and moss cannot establish themselves. Preventive treatment can extend the time between professional cleanings to 4-6 years compared to the 2-3 year cycle without treatment. It is one of the most cost-effective add-on services we offer for roof maintenance.