Moss Removal and Roof Cleaning in Ireland
Softwash, careful scraping and biocide treatment on slate and tile.
- 624Rated Contractors
- 26Counties Covered
- quote on inspectionTypical Cost
What Moss Removal & Roof Cleaning Involves
Moss removal and roof cleaning matters more in Ireland than in drier climates, because our damp, mild winters are ideal growing conditions. Moss holds water against the slate laps, works into the joints as it freezes and thaws, and breaks off in clumps that block gutters and valleys. Cleaning it off is straightforward, but doing it badly does more harm than the moss: high pressure water strips the surface off slate and drives water under the laps.
Typical cost: quote on inspection. See the full2026 roofing cost guide for how the figure is made up.
- Careful scraping and brushing rather than high pressure washing
- Softwash or biocide treatment to kill regrowth at the root
- Clearing the loosened debris out of gutters and valleys
- Checking for slates cracked or dislodged by the growth
- Advising on shading and ventilation that encourage regrowth
Signs You Need Moss Removal & Roof Cleaning
- Thick green or grey growth along the slate laps
- Clumps of moss in the gutters and at the downpipe outlets
- A roof slope that stays visibly damp long after rain
- Growth heaviest on the north facing slope
- Moss lifting the tail of individual slates
Not quite the job you have? Cleaning & Restoration also covers roof coating and restoration.
Moss Removal & Roof Cleaning By County
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Moss Removal & Roof Cleaning: Common Questions
Does moss actually damage a roof?
It does, indirectly. Moss holds moisture against the slate or tile and works into the laps, and when it freezes it expands and loosens the covering. The bigger everyday problem is the debris: moss breaking off is one of the most common causes of blocked gutters and valleys, which is what leads to damp inside.
Should a roof be pressure washed?
No. High pressure water strips the weathered surface off slate and concrete tile, forces water up under the laps and can dislodge slates outright. Careful scraping followed by a biocide treatment is slower but it is the approach that does not shorten the life of the roof. Be wary of anyone quoting a pressure wash on a slate roof.
How much does roof cleaning cost?
It is quoted after an inspection rather than at a fixed rate, because the price depends on the size and pitch of the roof, the access, how established the growth is and whether a biocide treatment is included. Ask for the quote in writing and for confirmation that no pressure washing is involved.
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