ROOF WASHING IN THE NORTH METRO
Dark Streaks?
Moss? Algae?
Roof Washing ✓
Roof Washing uses no pressure. The application is laid down with our Electric Soft Wash System on a fine mist setting, allowing the chemistry to do the work without risking unnecessary damage to shingles or other roofing materials.
ON THIS PAGE
Starting at $800
Our starting price for homes between 0-2,000 Square Feet in size.
2-year warranty
Built into every roof wash
3–8 week result window
Full visual improvement continues after treatment
No-pressure roof washing with a 2-year warranty.
Roof Washing removes black algae, lichen, mold, mildew, moss, and dark streaking using a no-pressure soft wash process with the gentlest application methods possible, backed by a 2-year roof washing warranty.
WHAT'S INCLUDED
Roof Washing clearly laid out.
Starting at $800, this service is built around a safer, more surface-appropriate process than what most people think of when they hear the word “pressure washing.”
Included
Typically ranges from $800-$1,600
No-pressure roof treatment
The roof is treated using a controlled no-pressure soft wash process designed for black algae, lichen, moss, mildew, and dark streaking.
No-pressure application
Most gentle methods possible
Designed around safer treatment of roofing materials, to protect your property, and it's warranties.
Included
Landscape prep and protection
Nearby landscaping and greenery are prepped and protected before treatment begins so any overspray is neutralized and kept harmless.
Warranty
2-year Roof Washing Warranty
If visible growth returns within the first year, Glass House re-treats the roof at no charge. If growth returns in year two, another roof wash is provided at half cost.
PROCESS
Treat the growth safely and let the chemistry do the heavy lifting.
Roof washing is one of the clearest examples of why pressure does not belong everywhere. The safest method is a no-pressure application that treats the growth and continues working over time rather than blasting the roof with force.
Protect the surroundings
Landscaping and nearby areas are prepped first so the treatment stays controlled.
Apply with our Soft Wash System
The roof is treated using the gentlest application methods possible so the solution lands evenly across the surface without relying on pressure.
Let the weather finish the work
Rain naturally reactivates the treatment over time, with the full visual improvement often developing over roughly 3–8 weeks.
WHY METHOD MATTERS
A cleaner result starts with using the right method for the material.
The method is part of the value. Good exterior cleaning is not just about blasting something until it looks lighter. Asphalt-roof guidance consistently pushes the conversation away from aggressive washing and toward gentler, manufacturer-aware care.
High pressure can shorten the life of a roof, and void your warrranty
Blasting shingles is not the same thing as cleaning them carefully, and it is not the method Glass House uses.
The treatment continues working after the appointment
Roof Washing is not always an instant-visual service. The process can continue improving as the treatment reacts over time.
Documentation matters
Roof Washing can be helpful for homeowners dealing with insurance-related appearance concerns or maintenance requirements.
WHAT HOMEOWNERS NORMALLY NOTICE FIRST
If you are seeing dark streaks, dark patches, algae growth, or moss buildup, you are in the right place.
Most homeowners do not start by searching for a chemistry name or a wash method. They start by noticing that the roof looks darker, patchier, streaked, or overgrown than it should. This page is built for exactly that moment.
Dark streaks
Dark streaking across shingles is one of the most common signs that the roof needs treatment rather than neglect.
Dark patches and uneven color
Patchy dark areas can make the whole roof look older and more worn than it really is, even when the fix is more straightforward than homeowners expect.
Algae growth or moss buildup
Visible algae and moss are clear signs that the roof would benefit from a no-pressure soft wash approach rather than waiting for the issue to become more noticeable.
WHAT MANUFACTURERS SAY
Roof manufacturers and insurer-facing maintenance advice both point directly to our approach.
Our methods are not just based on preference. Asphalt-roof guidance consistently points away from aggressive cleaning and toward safer maintenance, lower-pressure methods, and professional handling when algae, moss, and roof access are involved.
Asphalt-shingle guidance warns against pressure washing
Roof soft washing makes sense because asphalt-roof guidance warns that high-pressure washing and abrasive brushing can damage shingles and loosen granules. That is a big reason Glass House keeps Roof Washing no-pressure.
Algae can be aesthetic, moss is a bigger concern
Dark streaking is often what homeowners notice first, and algae discoloration is commonly treated as an appearance issue. Moss is the more damaging concern because it can interfere with the roof’s water-shedding function and hold moisture and debris in place.
Maintenance and documentation matter
Insurer-facing roof maintenance advice also reinforces that regular upkeep matters, including addressing staining, moss growth, and keeping gutters clean. That helps explain why so many homeowners want both the roof cleaned and the work documented properly.
WHERE WE SERVICE
Proudly serving the North Metro and surrounding communities.
Glass House focuses primarily on Ham Lake, Andover, Blaine, Forest Lake, Hugo, Maple Grove, White Bear Lake, Stillwater, Lino Lakes, Circle Pines, Coon Rapids, East Bethel, Cambridge, Oak Grove, and Lindstrom — and surrounding communities.
Primary service area
Ham Lake, Andover, Blaine, Forest Lake, Hugo, Maple Grove, White Bear Lake, Stillwater, Lino Lakes, Circle Pines, Coon Rapids, East Bethel, Cambridge, Oak Grove, and Lindstrom — and surrounding communities.
Fast local turnaround
Because Glass House is focused on the North Metro, many homeowners in the core service area can often be worked in quickly depending on the season and schedule.
Not sure if you are included?
If you are near these cities, reach out anyway. Glass House may still be able to help depending on the property, service type, and timing.
GUARANTEES
Clear expectations and standards.
This service is backed by guarantees that apply directly to it.
2-Year Roof Washing Warranty
If visible growth returns in the first year, Glass House re-treats the roof at no charge. If it returns in year two, another roof wash is provided at half cost.
Satisfaction Guarantee
If the roof washing does not live up to the Glass House standard of quality, the company stands behind the work with its general satisfaction guarantee.
REVIEWS
What people say about roof washing and our company overall.
5.0
38 Reviews on Google
★★★★★
Our Roof Washing reviews consistently point to the same things:
Clear communication, integrity, and professional results that are noticeable.
★★★★★
“I hired Glass House last year for roof washing, and their customer service is amazing! I already booked my spring appointment, and know Carson will do a wonderful job as always.”
K
Google · 9 weeks ago
★★★★★
“From our first conversation until the job was done we were very impressed with Carson. His communication was timely, professional and we knew exactly what to expect. He did a fabulous job on our exterior home wash.”
R
Google · 48 weeks ago
★★★★★
“Carson came out and hooked us up with the works. Gutters, house cleaning and windows. Did an amazing job and saved me a ton of work.”
J
Google · 1 day ago
FAQ
Roof Washing questions homeowners ask before scheduling.
This FAQ should help people understand what roof washing removes, why no-pressure matters, what the timeline looks like, and what removal does not magically solve.
What does Roof Washing remove?
Roof Washing targets black algae, lichen, moss, mildew, mold, and other organic buildup commonly seen on roofs in Minnesota. Dark streaks are often algae-related, while moss buildup is a bigger long-term water-shedding concern.
Does Roof Washing use pressure?
No. Roof Washing is performed using a no-pressure soft wash method with the gentlest application methods possible because aggressive pressure is the wrong fit for asphalt shingles and other delicate roofing surfaces.
How long does it take to see the full result?
In many cases, the roof looks better quickly, but some roofs continue improving over time as dead organic growth weathers away after treatment.
Will Roof Washing fix an old or failing roof?
No. Roof Washing addresses organic growth and discoloration. It does not repair missing shingles, failing flashing, leaks caused by construction defects, or age-related roof failure.
Is moss more serious than black streaks?
Usually yes. Dark streaking is often more of an appearance issue, while moss can interfere with water-shedding and hold moisture and debris in place.
How often should a roof be washed?
That depends on shade, moisture, nearby trees, roof orientation, and how quickly the roof tends to show algae or moss. Some roofs need attention sooner than others.
Gutters still matter
Gutter Cleaning is still part of the broader roofline-maintenance picture, even though ice dams and roof temperature issues are separate conversations.
Long-term roof care
Roof washing helps the active organic-growth problem, but it is still wise to address the broader maintenance picture around drainage, shade, and roof condition.
KEEP EXPLORING
More pages to help you complete your vision.
These pages help homeowners compare related services, and decide what services to schedule next that are going to impact their situation the most.
House Washing
We use a similar soft washing process for siding, soffits, eaves, and facades to rid them of algae, lichen, mold, mildew, and other organic growth, while avoiding high pressure.
Window Cleaning
Finish your exterior refresh with professional glass, screen, and track cleaning. If you have glass, we clean it.
Gutter Cleaning
This is a service that is smart to pair directly with roof washing, when the goal is full roofline drainage, and maintenance.
Pressure & Soft Washing Hub
Compare all four washing services we provide, and understand where pressure belongs, and where chemical applications are a better method.
Schedule & Pricing
Review starting prices, and plan your next steps.
FAQ & More
Keep reading through more educational content, built to help you better understand how to care for your home.