Treatment
Roof Moss Treatment
A biocide treatment left on the roof after the clean is what keeps it clean: €150 to €400 added to a clean, or €4 to €10 a m². A light re-treatment a year or two later, from €200 on a bungalow, costs far less than waiting for thick moss.
What the treatment does, how often, and what it costs.
Free, no obligation. One local company prices it, not five.
What it costs
| Job | Typical cost | What moves the price |
|---|---|---|
| Biocide treatment, added to a clean | €150 to €400 | Roof size; the product |
| Re-treatment of a bungalow, a year or two on | from €200 | Catching it before the moss is thick again |
| Biocide treatment, a m² | €4 to €10 extra | Roof size |
What the treatment does
The biocide stays on the roof surface and kills new spores before they take hold. Without it, a clean roof in the west of Ireland can be green again in 6 to 9 months. With it, most Irish roofs stay clean for a year to 18 months, and a sheltered one for two to four years.
- Put on in a dry spell, so the rain doesn't rinse it straight off.
- Re-treat before the moss is thick: it's a quick job, not a full clean.
- Cut back branches over the roof: shade is half the problem.
Cleaning jobs we cover
Soft wash roof cleaningLow pressure and a biocide. €300 to €1,800 on a 3-bed semi.More on soft wash roof cleaning →
Roof moss removalThick moss off by hand, then washed and treated. €350 to €750 for a small job.More on roof moss removal →
Roof and gutter cleaningWhere the moss ends up. €80 to €200 on their own.More on roof and gutter cleaning →
Render soft washingGreen algae and black streaks off the walls, at low pressure.More on render soft washing →
Slate and solar roofsTiles, natural slate and roofs with panels: what's safe.More on slate and solar roofs →Soft wash roof cleaning in every county
- CarlowSemi-D roof €650 to €1,700
- CavanSemi-D roof €650 to €1,700
- ClareSemi-D roof €650 to €1,700
- CorkSemi-D roof €750 to €1,900
- DonegalSemi-D roof €650 to €1,700
- DublinSemi-D roof €900 to €2,300
- GalwaySemi-D roof €750 to €1,900
- KerrySemi-D roof €650 to €1,700
- KildareSemi-D roof €800 to €2,100
- KilkennySemi-D roof €650 to €1,700
- LaoisSemi-D roof €650 to €1,700
- LeitrimSemi-D roof €650 to €1,700
- LimerickSemi-D roof €750 to €1,900
- LongfordSemi-D roof €650 to €1,700
- LouthSemi-D roof €650 to €1,700
- MayoSemi-D roof €650 to €1,700
- MeathSemi-D roof €800 to €2,100
- MonaghanSemi-D roof €650 to €1,700
- OffalySemi-D roof €650 to €1,700
- RoscommonSemi-D roof €650 to €1,700
- SligoSemi-D roof €650 to €1,700
- TipperarySemi-D roof €650 to €1,700
- WaterfordSemi-D roof €650 to €1,700
- WestmeathSemi-D roof €650 to €1,700
- WexfordSemi-D roof €650 to €1,700
- WicklowSemi-D roof €800 to €2,100
Free quote
Get a soft wash price in 4 taps
Tap what you need and leave your number. It goes to one roof cleaning company that covers your county, and they ring you back with a price, often from a photo.
Questions people ask
Can I just have the treatment, no clean?
On a roof with only a film of algae, yes. Thick moss has to come off first, or the treatment can't reach the tiles.
How often should a roof be treated?
Every year or two on a shaded or western roof; every few years on a sunny, sheltered one.
Is the treatment safe for the garden?
Applied properly at low pressure, yes. Ask what product is used and how beds and ponds are covered.
Get a free price for your roof
One local roof cleaning company, often a price from a photo. Free, no obligation.