Moss, algae and lichen spreading across your roof? Keystone Roofing's soft-wash roof cleaning lifts growth without the high-pressure blasting that cracks tiles and strips their protective surface. We inspect first, clear the roof and gutters, and treat the surface so it stays cleaner for longer — all backed by our 20-year workmanship guarantee.
Every project follows a clear inspection, quote, delivery, and quality review path so you know what is happening before work begins.
We assess the tile type, the roof condition and how far the moss, algae or lichen has spread — often using a drone so we can see the whole roof without ladders. This tells us the safe cleaning method and flags any slipped or cracked tiles hiding under the growth.
We clear the growth using low-pressure soft washing and hand tools where needed. Jet-washing is faster but cracks ageing Cork tiles and strips their protective surface, so we avoid it on anything but the most robust roofs.
Once the roof is clean we apply a biocide that keeps moss and algae back far longer than cleaning alone. We then clear the gutters and downpipes of everything washed down, so rainwater drains properly afterwards.
We walk the finished job with you, point out anything to keep an eye on, and back the workmanship with our written 20-year guarantee. If the clean uncovered repairs, you get a separate written quote — no pressure to proceed.
Cork's damp Atlantic climate is ideal for moss, algae and lichen — especially on north-facing slopes and shaded roofs that rarely dry out. Left alone, moss holds moisture against the tiles, lifts and slips them, and washes down into the gutters where it causes overflows and damp walls. Our roof cleaning starts with an inspection (often by drone) so we know the tile type and condition before we touch it. We then soft-wash the roof — low pressure plus a biocide treatment — rather than jet-washing, which can crack older Cork tiles and blast off their weatherproof coating. You get a cleaner, safer roof, clear gutters, and honest advice on any repairs the growth was hiding.
We start with a practical assessment, explain the condition of the roof, and agree the right scope before work begins. You get updates during the job, daily site care where needed, and a final review before handover.
Timing depends on access, weather, materials, and the scale of the work, but our team keeps the process straightforward from first call to completion.
Read real Google and Trustpilot feedback from Keystone Roofing customers across Cork before booking roof cleaning.
Keystone Roofing Ltd handled a slate roof repair and new lead flashing on our terraced house in Douglas, Cork. They explained the issue clearly, fixed a persistent leak, and left the place tidy. Highly Recomended!
The team did an immaculate job doing a whole new roof. Very easy to communicate, friendly, professional and hard working. Definitely would recommend. Thanks for a job well done!
Keystone Roofing repaired a leak in my roof recently Michael called to inspect the damage and the crew arrived the next morning They did a fantastic job and Im extremely happy with the result A great company to deal with and I would highly recommend them Thanks Michael and crew E Hayes
Work carried out to a high standard, here when they said they would be, worked until darkness somedays. Bigger job than expected, worked up until Christmas Eve to make sure work was completed.
A roof replacement customer praised the clear communication, honest advice, professional team and quality finish from Michael and the crew.
A customer highlighted reliable workmanship, efficient service and careful attention to detail on their Keystone Roofing project.
This customer described the new roof installation as smooth and hassle-free, with a friendly team and a result they were happy to recommend.
An emergency repair customer praised the quick response, cost-effective service and practical help when urgent roof work was needed.
Speak with Keystone Roofing about your roof, get a clear assessment, and understand the next step before committing to work.
Soft-wash roof cleaning across Cork City and County Cork — moss, algae and lichen lifted from tiled and slate roofs, gutters cleared of washed-down debris, and surfaces biocide-treated to slow regrowth. Every job inspected first and backed by our 20-year workmanship guarantee.
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Ask About Roof CleaningRoof cleaning in Cork is priced by roof size, pitch, access and how heavy the moss or algae growth is. A typical 3-bed semi soft-wash clean with biocide treatment and gutter clear-out is usually a few hundred euro; larger, steeper or heavily infested roofs cost more. Our inspection and written quote are free, so you get an exact price before any work starts.
It can — if it is done with a high-pressure jet wash. Pressure washing forces water under the tiles and strips the protective surface off ageing concrete tiles, shortening their life. We use a soft-wash method (low pressure plus a biocide) that lifts moss and algae without that damage, which is why we inspect the tile type first.
Some regrowth is natural in Cork's damp climate, but the biocide treatment we apply after cleaning keeps moss and algae back far longer than a clean on its own. Most homeowners get several years before another clean is worthwhile, and a quick drone check at your next inspection tells you when it is due.
Light surface algae is mostly cosmetic, but thick moss is worth removing: it holds water against the tiles, can lift and slip them, and washes into gutters causing overflows and damp. Cleaning it also lets us spot cracked or slipped tiles the growth was hiding before they become leaks.
Practical, Cork-specific guides written by Michael Casey and the Keystone Roofing team — covering pricing, diagnosis and what to expect.
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