Roof Cleaning
in Baltimore, MD
Soft Wash Roof Cleaning in Baltimore
That Kills Algae at the Root
Dark streaks creeping across your shingles are not just dirt. That black staining is Gloeocapsa magma, a type of cyanobacteria that feeds on moisture and shade and thrives in humid summers. Once the growth takes hold, it spreads season after season, trapping moisture against the shingle surface and breaking down the asphalt underneath. Left untreated, it shortens your roof’s lifespan and drags down the look of your entire property.
We remove that growth safely using a soft wash chemical application that follows ARMA (Asphalt Roofing Manufacturers Association) guidelines. No pressure washer touches your shingles. Our cleaning solution is applied at garden-hose pressure, killing biological organisms at the root while preserving your roof’s protective granule layer and keeping your manufacturer’s warranty intact.
Call (443) 531-6660 to request a free quote, or fill out the online contact form. Every estimate covers the full scope of work, pricing, and what to expect after the service.
Types of Roofs We Clean
in Baltimore
We use the same safe, low-pressure chemical application on every roof material.
Here is how we handle the most common types across the Baltimore area.
Asphalt Shingle Roofs
Metal Roofs
Slate Roofs
Tile and Clay Roofs
Why Baltimore Homeowners Trust Us With Their Roofs
ARMA Manufacturer Compliance
Every estimate includes a direct link to the ARMA shingle manufacturer cleaning guidelines so you can verify, in the manufacturer's own words, that soft washing is the approved method.
Honest Partial-Roof Recommendations
If only your shaded pitch has staining and the sun-exposed sides look clean, we recommend a partial wash instead of charging for the full roof.
Written Contracts With Clear Expectations
Your estimate spells out scope, pricing, ARMA compliance, and the 30-day rainfall protocol so you have everything in writing before any work begins.
Before and After Photo Documentation
Every job is documented with timestamped photos through Company Cam, accessible through your customer portal at any time.
You Only Pay After You Inspect
You review the completed work first. Once you confirm you are satisfied, we send the invoice.
Five-Star Reviews Built on Results
We compete on the quality of our work, the transparency of our process, and the reviews that speak for themselves.
Ready to See Your
Roof Clean Again?
How We Clean Your Roof
1
We Assess Your Roof and Build a Custom Quote
We evaluate your roof’s pitch, square footage, valleys, dormers, the type of biological growth present, and how your downspouts are routed. You receive a two-page written estimate through Housecall Pro that includes full pricing, scope, the ARMA guidelines link, and a clear explanation of the 30-day post-service process.
2
We Protect Your Plants and Contain the Runoff
Before any chemical is applied, we pre-wet all shrubs, flowers, and grass in the runoff path. When temperatures are above 70°F, this step becomes especially critical because heat accelerates chemical absorption in plant tissue. Any downspout draining into a flower bed gets bagged with zip ties to capture runoff. Pre-wetting is the correct protective method because covering plants traps heat and causes more damage than the chemical itself. If your gutters are clogged or draining poorly, we recommend scheduling a gutter cleaning before or alongside your roof wash to keep chemical flow controlled.
3
We Apply the Solution and Let Gravity Do the Work
We apply a sodium hypochlorite solution mixed with a surfactant at 3 to 4% concentration using our soft wash system at garden-hose pressure. The crew works from the peak downward, letting gravity carry the solution from the ridge line to the gutters. No pressure washer is involved at any point.
4
Rain Does the Rest Over 30 Days
On most jobs, we do not rinse the roof. The chemical kills biological growth on contact, and natural rainfall over the following 30 days washes the dead material away. This is the standard soft wash approach and produces the best long-term results. A rinse step is only added when there is heavy, embedded lichen or moss that needs physical help clearing.
5
You Inspect, You Approve, Then We Bill
We photograph your roof before and after every job through Company Cam. Once the work is complete, you walk the property and review the results before we send an invoice.
What Roof Cleaning Costs
in Baltimore
Most roof cleaning projects fall between $350 and $1,800, with final pricing based on the size and complexity of your specific roof. A small, accessible roof with minimal pitch starts at $350 to $399. Larger homes with multiple additions, valleys, dormers, steep pitch, and difficult access can reach $1,500 to $1,800. If only one side of your roof needs cleaning, a partial-roof wash typically costs $399 to $450 for the front-facing side only.
Several factors determine where your project lands in that range:
Most jobs take between 2 and 7 hours depending on these factors. We confirm scope and pricing during the estimate so there are no surprises once the crew arrives. When you combine roof cleaning with other services on the same day, such as a house wash, gutter cleaning, or window cleaning, we offer 5 to 10% off each service.
Our Roof Cleaning Guarantee
We back every roof cleaning with a five-year guarantee. If biological staining returns at any point within that window, we come back and respray the affected areas at no charge. Your contract also includes a written 30-day rainfall clause. After 30 days and multiple rainfalls, if any shingles still appear darkened or stained, call us. We return and respray those specific areas free of charge. This is a formal, written commitment in your contract, not a verbal promise.
There are a few conditions worth knowing:
Clear expectations before the work starts are the reason we have never been called back on a roof cleaning job outside of the routine 30-day respray.
Frequently Asked Questions
Will my roof look completely clean the same day?
In most cases, you will see a dramatic improvement right away, especially with standard algae and mildew staining. For heavier moss or lichen, the full result develops over 30 days as rainfall washes the dead material from the shingle surface. We set this expectation before the job begins and include the 30-day protocol in your written contract.
Will soft washing damage my shingles or void my warranty?
No. We follow ARMA manufacturer guidelines, which specifically endorse low-pressure chemical cleaning as the approved method for shingle roofs. A link to those guidelines is included in your estimate. Pressure washing, on the other hand, strips protective granules and can void your warranty. We never use a pressure washer on any roof surface.
What happens to my plants during the cleaning?
We pre-wet all vegetation in the runoff path before applying any chemical, and downspouts that drain into flower beds are bagged to capture runoff. If your downspouts pipe underground, we let you know in advance about potential impact in the drainage area.
Do I need my entire roof cleaned?
Not always. If only the north-facing or shaded side of your roof shows staining, we will recommend cleaning just that portion. South and east-facing pitches receive enough direct sun to stay clean on their own. A partial clean typically runs $399 to $450 and saves you from paying for work your roof does not need.
What if staining comes back after the cleaning?
Our five-year guarantee has you covered. Call us and we schedule a complimentary respray of the affected areas. In the first 30 days, the written contract clause covers any spots that remain darkened after multiple rainfalls.
Can you clean very steep or very tall roofs?
We assess these on a case-by-case basis. For roofs where walking the crown is not safe, our crew works from ladders at the gutter line. Roofs that require 40-foot ladders or a rented lift are evaluated based on the scope and cost of the job. Safety determines how we approach every steep or high roof, and we are upfront about access limitations during the estimate.
How long will my roof stay clean?
We guarantee five years. The actual timeline depends on your environment. Tree branches touching the roof are the biggest factor in early regrowth. Shaded, north-facing pitches restain faster than sun-exposed sides. Trimming any branches that contact your shingles is the most effective thing you can do to extend your results.
What chemicals do you use?
We use sodium hypochlorite at a 3 to 4% concentration mixed with a surfactant. This is the industry-standard soft wash roof cleaning solution. It kills algae, mold, mildew, and lichen at the root. For comparison, house washing uses a much lower concentration of 0.5 to 1% because siding does not accumulate the same depth of embedded growth.
Get Rid of Those Black Streaks
on Your Baltimore Roof Today
Every rain feeds the growth, and every humid week makes it worse. The longer you wait, the deeper that algae digs into your shingles. Call us at (443) 531-6660 to schedule your free estimate, or submit a request through the website. We will walk your roof’s details with you and put together a written quote tailored to your home.