Why moss grows on UK roofs
Damp climate, shaded elevations, and slow-drying north-facing slopes create ideal moss-growing conditions all year round.
Damage risks
Moss lifts tile edges, blocks valleys and gutters, holds moisture against pointing, and can cause interior leaks if left for years.
Why pressure washing is wrong for roofs
It strips the tile surface coating, forces water up under the felt, damages pointing, and dramatically shortens roof life.
Softwash process
Low-pressure application of biocide solution, left to work for 4-8 weeks, moss turns brown and falls off naturally with rain and wind.
Safety
Roof work is a leading cause of UK trade injuries - Jet Kings uses roof ladders, harnesses, and ground-level application where possible.
Long-term protection
Biocide treatment lasts 3-5 years. Copper or zinc strips along the ridge line release ions during rain that slow moss return further.
Frequently asked questions
Will moss fall off on its own after treatment? Yes - biocide kills the moss and rain gradually washes it away over 4-8 weeks. No scraping or pressure washing needed.
Can I scrape moss off my roof myself? We do not recommend DIY scraping - falls from ladders and roof edges cause thousands of UK injuries each year and broken tiles lead to leaks.
How long does roof moss treatment last? Typically 3-5 years depending on roof orientation and shading. North-facing slopes may need sooner retreatment than south-facing.
Related services and locations
Need help now, contact Jet Kings for advice and a free quote.
Why Moss on Your Roof is a Problem
Moss on a roof is not just cosmetic. Moss acts like a sponge, absorbing and holding water against the tiles. In winter, that trapped water freezes and expands — a process called frost spalling — which can crack concrete tiles and delaminate their surface. Over time, moss growth works its way under tiles, lifting them and creating gaps where water can enter the roof space.
Moss also blocks the natural channels between tiles that direct water down to the gutters. When those channels are blocked, water can back up under the tiles or overflow the gutters in the wrong places. And as moss grows thicker, it adds weight to the roof — a fully moss-covered roof on a typical semi-detached house can hold several hundred kilograms of extra water weight when wet.
How Professionals Remove Roof Moss
Professional roof moss removal follows a careful process designed to clean the roof without damaging it:
- Survey and access setup: We assess the roof type, pitch, access points and safety requirements. For most residential roofs, we work from ladders and roof ladders. For steeper or higher roofs, a cherry picker or scaffolding may be needed.
- Manual moss removal: Using long-handled scrapers and brushes, we remove the bulk of the moss by hand. This is done carefully to avoid dislodging or cracking tiles. We do not use high-pressure water on roofs — the risk of forcing water under tiles and into the loft is too great.
- Soft washing treatment: After manual removal, we apply a biocide treatment at low pressure. This kills remaining moss spores, lichen and algae at the root. The treatment continues working for weeks after application.
- Gutter clearance: All the dislodged moss and debris is cleared from gutters and downpipes as part of the job. We do not leave your gutters full of the moss we have just removed from the roof.
- Final check: We inspect the roof to confirm all moss has been cleared from valleys, junctions and tile edges — the areas where problems are most likely to develop.
DIY Roof Moss Removal: The Risks
Working on a roof is dangerous. Falls from height are one of the most common causes of serious injury in home maintenance. Beyond the safety risk, DIY roof cleaning often causes damage: aggressive scraping cracks tiles, pressure washing forces water into the loft, and walking on tiles without roof ladders can break them. The cost of professional roof cleaning is modest compared to the cost of repairing a damaged roof — or the cost of a fall.
Frequently Asked Questions
How long does roof moss removal take?
A standard semi-detached house typically takes one day for manual moss removal and biocide application. The biocide continues working for several weeks, during which the remaining moss and staining gradually weather away.
Will the moss grow back?
Eventually, yes — but the biocide treatment significantly slows regrowth. Most roofs stay clean for 3-5 years after professional treatment. Roofs near overhanging trees may need attention sooner.
Can you clean a roof in winter?
We prefer to clean roofs in spring, summer and early autumn when conditions are safer. Winter work is possible on dry, mild days but we will not work on a roof in wet, windy or icy conditions for safety reasons.
Does roof moss removal include gutter cleaning?
Yes. Clearing the gutters of dislodged moss and debris is a standard part of every roof moss removal job we do. We would not consider the job complete otherwise.
Related Services
roof cleaning in Leicester | gutter cleaning services
Areas We Cover
For a free, no-obligation quote, call 07954 028819 or contact us online.