Your roof is your property's primary defence against the weather we get here on Teesside — and the damp, coastal-influenced climate makes our tiles a perfect breeding ground for moss, lichen and algae. We restore them with a methodical manual dry-scrape and an HSE-approved low-pressure biocide soft wash. Never a high-pressure jet washer.
What begins as a slight green tint on your tiles rapidly evolves into thick, heavy clumps of organic growth. Moss is a silent destroyer of roofing materials.
Across the Tees Valley and the wider North East, the incredible diversity of our housing stock is united by a single, persistent structural threat: the aggressive colonisation of roof moss, lichen, and airborne black algae. Whether you own a grand Victorian terrace in a conservation area, a mid-century semi-detached home, or a modern executive property on a new development, the local environment is working tirelessly against your roof.
Our unique regional microclimate—characterised by coastal fogs, high humidity from the River Tees, and frequent seasonal rainfall—creates the ultimate botanical incubator for organic growth. What begins as a slight green tint on your tiles rapidly evolves into thick, heavy clumps of moisture-retaining moss. This is far more than a cosmetic annoyance; moss is a silent destroyer of roofing materials.
At Operation Clean, we deliver premium, environmentally compliant roof moss removal and soft washing services throughout the North East. We firmly reject the use of destructive high-pressure washing.
Instead, we utilise a highly controlled, manual dry-scraping methodology combined with an HSE-approved biocide soft wash. This dual-action approach safely eradicates all organic growth, restores the factory finish of your tiles, and provides long-lasting protection against regrowth, ensuring your home remains pristine and structurally sound.
Modern estates across Teesside. Sand-faced coatings degrade and become highly porous.
Period properties and conservation areas. Extremely vulnerable to frost heave and ice wedging.
Operation Clean is deeply committed to protecting our local Teesside environment, particularly our vital waterways and delicate coastal ecosystems. We strictly adhere to the regulations set forth by the Environment Agency and the Health and Safety Executive (HSE) regarding the application of exterior biocides.
It is highly irresponsible—and environmentally damaging—to spray raw chemicals directly onto thick, established moss. When untrained contractors attempt this "chemical drenching" method, the biocide cannot penetrate the thick organic mass. Instead, the chemical sits on the surface until the next heavy rainfall, at which point it washes directly down your gutters, overwhelming municipal storm drains and potentially contaminating local rivers.
To guarantee environmental safety, we operate a mandatory dry-scraping policy. We physically remove the bulk of the moss before any chemical is introduced. By eliminating up to 90% of the heavy organic mass first, we drastically reduce the volume of biocide required to sanitise the roof, ensuring zero toxic runoff and complete compliance with UK environmental law.
Thick moss left in place
The mass is never removed first.
Chemical cannot reach the root
It saturates the moss, not the tile.
The next heavy rain arrives
Unabsorbed biocide is washed straight off.
Runoff enters local waterways
Down the gutters and into the storm drains.
Moss is dry-scraped by hand
90% of the organic mass removed and bagged.
Minimal biocide volume required
Only the spores in the tile pores are treated.
Biocide soaks into the tile
Absorbed on contact, not left sitting on moss.
Zero harmful runoff
Full Environment Agency and HSE compliance.
Pointing a high-pressure lance at a residential roof is one of the most damaging things a contractor can do to your property. Manufacturers design roof tiles to withstand downward rainfall — not upward blasts of highly pressurised water.
What actually happens to your roof.
Jet washed: the facing is gone, the membrane is breached, and the moss root system survives in the tile. Our method: the moss lifts away dry, every layer below it stays intact, and a low-pressure biocide finishes the spores.
Modern concrete tiles are manufactured with a specialised sand-faced coating designed to reflect harmful UV rays and repel rainwater. High-pressure lances aggressively strip this crucial factory layer away. While the roof may look temporarily clean, the raw, highly porous concrete underneath is now fully exposed to the elements, reducing the lifespan of the tile by decades.
Roof tiles are designed to channel water strictly downwards. They are not engineered to withstand water being blasted upwards or horizontally at 3,000 PSI. Jet washing forces high volumes of water underneath the overlapping tiles and directly onto the breathable felt membrane beneath. This overwhelms the waterproofing, flooding your roof void, saturating your loft insulation, and introducing severe damp into your upper ceilings.
Pressure washing is a blunt instrument. It blasts away the visible green mass but fails to eliminate the microscopic spores buried deep within the tile. Because the jet wash has now stripped the protective layer and left the tile highly porous, the roof retains even more moisture. Consequently, the moss will grow back thicker and more aggressively within a matter of months.
We work entirely from the safety of the gutter line using advanced access equipment. We never walk on your fragile roof tiles, which entirely eliminates the risk of cracked tiles and collapsed battens.
Before commencing the roof scrape, we lock down the site. We conduct a full structural assessment of the roofline. We then deploy heavy-duty, breathable ground sheets over your patios, decking, conservatories, and driveways.
We are particularly careful around manicured lawns and delicate flowerbeds. Finally, we mechanically cap all downpipes to ensure that no dislodged moss or debris can enter your subterranean soakaways or main drains.
Utilising ultra-lightweight, high-modulus carbon fibre poles, we work safely from the gutter line or specialised access towers. Attached to these poles are bespoke, laser-profiled scraping blades. We carry dozens of blade profiles, ensuring we have the exact match for your specific tile—whether it’s a modern interlocking concrete profile or a fragile traditional slate.
We systematically draw the blade down each individual tile, gently breaking the bond between the moss and the roof. This safely removes the heavy organic burden without causing a single scratch to the tile’s protective face.
With the roof now clear of the heavy moss blanket, we target the microscopic spores and deep-rooted lichen. We utilise a custom-built, 12-volt low-pressure delivery system (often referred to as a soft wash system) to gently apply an HSE-approved DDAC biocide.
This targeted treatment absorbs deeply into the pores of the roof tiles, destroying the algae and lichen at a cellular level. The application relies entirely on chemistry, not pressure. Over the subsequent weeks, natural weathering will gently break down the dead biological matter, gradually revealing the pristine, original colour of your roof.
Removing moss from a roof is a messy process, and much of the debris inevitably falls into the guttering. As a standard part of our restoration package, we deploy a powerful, multi-motor industrial gutter vacuum.
We clear the entire perimeter of your guttering system, extracting all moss, silt, and granular debris from the ground level. We finish the project by washing down your fascias, windows, and ground-level pathways, leaving your property in immaculate condition.
Moss thrives in damp, shaded environments where sunlight cannot effectively dry the morning dew or winter rain. It does not have traditional roots; instead, it uses tiny rhizoids to anchor itself into the microscopic pores of your concrete, clay, or slate roof tiles.
Once anchored, it acts as a highly efficient sponge. A thick blanket of moss can absorb and hold up to twenty times its own weight in rainwater. This means your roof is forced to bear hundreds of kilograms of excess, continuous moisture.
During the freezing Teesside winters, this trapped moisture undergoes a severe freeze-thaw cycle. This microscopic expansion slowly fractures the tile’s surface, leading to flaking, cracking, and eventual delamination. By the time spring arrives, the structural integrity of the roof has been severely compromised, often resulting in slipped tiles, water ingress, and highly expensive timber rot within the loft space.
its own weight in rainwater — the load untreated moss holds against your tiles, every day of the year.
Moss holds up to 20 times its own weight in rainwater, pressed against your tiles all year round.
Through a hard Teesside winter that trapped moisture freezes solid inside the tile surface.
Ice expands, forcing concrete and clay to crack, blister and ultimately delaminate.
Over time the structural integrity of the entire roof fails, leading to slipped tiles and severe water leaks.
When you hire Operation Clean, you are partnering with dedicated exterior restoration specialists, not general labourers. We understand the specific architectural nuances of properties across the North East. Whether you reside in a grand period property requiring careful slate scraping, or a modern family home with concrete interlocking tiles, we have the exact equipment, chemical knowledge, and access solutions required to execute the job flawlessly.
We are a fully self-contained operation. Our vans arrive equipped with onboard purified water systems and independent power supplies, meaning we do not need to run trailing cables through your home or rely on your outside tap, ensuring a completely hassle-free experience.
Telescopic carbon fibre poles and low-level platform ladders mean no scaffolding in 95% of residential jobs — and nobody walking on your fragile tiles.
DDAC biocide applied through a 12v low-pressure system at minimal volume, strictly within UK environmental law.
Laser-cut scraping blades matched to your exact profile, so the granular face is preserved as the moss comes away.
We bring our own purified water and power to every job, so there is zero disruption to your daily routine.
A fully mobile, self-contained unit — we bring our own purified water and power to every job.
No, your garden is completely safe. Because we dry-scrape the heavy moss first, the volume of biocide we use is incredibly low and highly targeted. Furthermore, as part of our strict site protection protocol, we thoroughly pre-soak and post-rinse all surrounding grass, plants, and shrubs with fresh water. This instantly neutralises any microscopic airborne overspray. Once the biocide has dried on the roof tiles (usually within 60 minutes), it becomes completely inert.
For a standard three-bedroom semi-detached or detached home, our two-man specialist team will typically complete the entire 4-phase process (preparation, scraping, soft washing, and gutter clearing) within a single working day. Larger properties or roofs with exceptionally heavy moss burdens may take slightly longer, but we will always outline the exact timeframe during your initial quotation.
In the vast majority of cases, absolutely not. The core advantage of our carbon fibre pole system is that it allows us to reach up to three storeys high whilst standing safely on the ground or on secure, low-level platforms. This eliminates the massive expense, visual intrusion, and delays associated with hiring scaffolding, making our service highly efficient and cost-effective.
While the thick green moss is removed instantly during the dry-scraping phase, the black and white lichen (often called "black spot") has deeply embedded root systems. Our biocide kills these organisms instantly on contact. However, it takes time for the dead biomass to detach from the tile. You will see a dramatic improvement on day one, but the roof will continue to clean itself and brighten significantly over the following 3 to 6 months as the weather naturally washes the dead lichen away.
We offer our specialist roof cleaning and moss removal services across the entire Tees Valley and North East region, including Stockton-on-Tees, Middlesbrough, Darlington, Hartlepool, Redcar, and surrounding areas. If your home is suffering from a moss infestation, we are your local, professional solution.
Tell us a little about your property and the moss coverage, and we will come back with a clear, fixed price — no obligation, no pressure, and no jet washers.
We confirm the right details before pricing.
We usually reply within the hour — no waiting on hold.
