A roof washing service is the careful cleaning of the roof surface to lift the organic growth that causes black streaks, moss, lichen, and the dark staining that runs down the slope when rainwater carries that growth with it. The work is done at low pressure with cleaning solutions selected for the material and the buildup being treated. A pressure washer is not used on the shingles. That distinction matters, because high-pressure water strips the protective granules off asphalt shingles, drives water under flashing, and shortens the life of the roof.

Soft wash roof cleaning, by contrast, lets the cleaning solution do the lifting and keeps the rinse gentle. The same soft washing method works on other exterior surfaces where pressure washing would do harm, but the dedicated low-pressure pump for roof work is what protects the shingles and keeps the warranty valid.

Our roof cleaning service covers the full scope of what most East Tennessee properties need, with method and materials matched to each roof.

• Low pressure roof cleaning. A dedicated low-pressure pump handles the work. No pressure washer touches the shingle material. The cleaning solution does the lifting, and the rinse keeps the shingles intact.
• Professional-grade cleaning solutions. Solutions are selected for the buildup being treated, not blanket-applied to every roof. The right mix for moss is different from the right mix for algae, and the right mix for a metal roof is different from the right mix for asphalt.
• Roof moss removal. Where moss is present, removal includes attention to the root-like structures that grip the shingles and trap moisture against the surface. The moss is lifted, not just rinsed off.
• Asphalt shingle and metal roof cleaning. Both materials are covered, with the method adjusted for the surface.
• Residential and commercial roof washing. From single-family homes to churches, civic buildings, retail properties, and warehouses across the region, our commercial roof cleaning services are part of the regular work.

A clean roof does more than improve curb appeal, though that’s the first thing most homeowners notice. Removing algae, moss, and lichen takes away the organic mat that traps moisture against the shingles. Less trapped moisture means the surface dries faster after rain, which slows the wear on the granules that protect the shingles from UV damage.

The same maintenance protects a serious financial investment. A roof replacement runs into five figures, and routine cleaning extends the working life of the shingles already on the house. For homes shaded by mature trees, this is steady upkeep, not a one-time fix. Moisture lingers longer under canopy, and growth returns over time, which is why most properties benefit from a regular cleaning rhythm.

And there’s the simple relief of looking up at your own house and seeing the roof the way you remember it, before the streaks set in.

For East Tennessee homeowners, Selk Solutions provides careful roof cleaning services designed to restore curb appeal, protect the roof, and treat the surrounding property with respect. Whether it is a family home in Crossville, a lake house at Tansi, or a hillside home in West Knoxville, the crew uses a low-pressure roof cleaning method, protects landscaping and nearby surfaces, communicates clearly, and completes the work with attention to detail.

For businesses, churches, civic facilities, property managers, and commercial buildings, Selk Solutions brings the same careful process to larger and more complex properties. Commercial roof cleaning services are handled with clear scopes, property walkthroughs, surface-safe methods, proof of insurance, and dependable follow-through—whether the project involves a storefront, steeple, facility roof, or larger flat-roof property.

Whether you need residential cleaning or commercial maintenance, our professional pressure washing work is built around the surface, the property, and the result you want.

• A dedicated low-pressure pump for roof cleaning. No pressure washer is used on the shingles, period.
• Cleaning solutions selected for the material and the buildup being treated, not blanket-applied across every property.
• Workers’ comp coverage on all employees and substantial insurance, which matters anytime a roof cleaning contractor is working at height on your roof.
• Plants, landscaping, and outdoor items protected before, during, and after the wash by a careful crew.
• Year-round service, weather permitting, including winter days when temperatures allow.
• Track record across residential and commercial properties, including steeple cleaning at Friendship Baptist Church in Rockwood and civic work at Art Circle Public Library.

1. Onsite inspection. A team member walks the property with you, looks at the roof from accessible angles, and notes the buildup, growth, and any spots that need special handling.
2. Free, no-obligation estimate. Scope, method, and price are written down so nothing is left vague.
3. Scheduling. Booked around weather and your calendar, then confirmed close to the date.
4. Pre-job walkthrough. The crew explains where they’re starting, how plants and landscaping will be protected, and what to expect during the roof wash.
5. Surface preparation. Plants are rinsed, items are moved or covered, and the work area is set up for safe, controlled cleaning.
6. Cleaning the roof. Low-pressure cleaning with surface-appropriate solutions lifts algae, moss, and organic staining from the shingles. No pressure washer is used on the roof.
7. Post-job walkthrough. You see the result and flag anything you want adjusted before the crew packs up.

East Tennessee Sits Inside the Algae Danger Zone

Most of the black streaks on asphalt shingles across our region are Gloeocapsa magma, an algae that thrives in hot, humid summers. More than 80% of U.S. roofs sit inside the algae danger zone, with the Southeast called out as the highest-risk region within that map. East Tennessee sits squarely in that band.

Once it takes hold, the algae feeds on the limestone filler in asphalt shingles and spreads slowly down the slope. The streaks people see are the visible part of a much larger colony, heaviest on the sections of the roof that get the least direct sun. Cleaning the roof lifts the growth and slows its return, but the underlying climate stays favorable to it. That’s why roofs in this region typically benefit from a wash every few years rather than once a decade, and why a single deep cleaning is rarely the end of the story.

Tree Canopy Compounds the Problem

Shade and humidity work together. A roof that dries quickly after a storm gives algae and moss less to work with, while a roof that stays damp under heavy tree cover gives them a foothold. More canopy means more shade, more shade means slower drying, and slower drying means faster colonization on the shingles. The pattern shows up most clearly on north-facing slopes and on rooflines that sit under mature hardwoods year-round.

That dynamic varies a lot by neighborhood. Knoxville’s tree canopy covers 38% of the city, with individual neighborhoods ranging anywhere from 5% to 63%. Homes in older, tree-lined pockets like Sequoyah Hills or Bearden sit under significantly more shade than open-lot suburban properties on the same street grid, and that difference shows up on the roof.

Routine Cleaning Beats Catch-Up Cleaning

Letting algae and moss sit for years makes removal harder, and the surfaces underneath age faster. A regular cleaning rhythm, every few years and sooner under heavy canopy, keeps the roof on track and the shingles working the way they were designed to.

When you’re ready for a cleaner roof and a few more years out of the shingles, request an estimate or reach out and we’ll talk through what your roof needs.

Roof Washing Service FAQs