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How Often Should a Roof Be Cleaned?

Every three to five years for most Irish roofs, sooner on a north-facing or tree-shaded roof. A clean with a moss killer holds the moss back for one to four years.

How long a clean lasts, how long the job takes, and when moss dies.

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  • 3–5 yearsbetween cleans for most roofs
  • 1–4 yearsa moss killer holds it back
  • Hours to a dayon site
  • Soonerunder trees and facing north

How often a roof needs cleaning

How often should a roof be cleaned in Ireland?

Every three to five years for most Irish roofs, sooner on a north-facing or tree-shaded roof. A clean with a moss killer holds the moss back for one to four years.

QuestionAnswer
How oftenEvery 3–5 years, sooner if shaded
How long a clean with a moss killer lasts1–4 years
Without a moss killerMoss back in 6–9 months in the west of Ireland
How long the job takesA couple of hours to a full day
How long until the moss is goneAbout a month per year untreated

The same clean lasts longer on an open, south-facing roof than under trees. A yearly moss killer re-treat is the cheap way to stretch it.

Real roofs, before and after

Jobs shared by the Irish companies that did them. Each says where it was.

Before: Slate roof of a church, moss removed, Co. Meath
After: Slate roof of a church, moss removed, Co. Meath
Slate. Slate roof of a church, moss removed, Co. MeathCushions of moss off the slates and out of the valley gutter, by hand.
Before: Tiled roof with solar panels, Co. Meath
After: Tiled roof with solar panels, Co. Meath
Tiles. Tiled roof with solar panels, Co. MeathMoss and grime off the tiles, cleaned around the panels and the roof windows.
Before: Slate roof, moss scraped off by hand, Co. Meath
After: Slate roof, moss scraped off by hand, Co. Meath
Slate. Slate roof, moss scraped off by hand, Co. MeathBefore: moss in every joint. After: the same roof from the ridge, cleared.
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What roof cleaning costs in Limerick

Typical prices for typical roofs, by house and by method.

JobTypical priceWhat moves the price
Moss killer (biocide) on its own€4–€10 per m² extra, from about €200 for a bungalow re-treatSprayed at low pressure, left to work
Semi-detached, 3 bed€400–€1,800Moss depth, roof size, tiles or slate
Detached house€450–€3,000+Size, height, and whether it needs scaffolding
Gutters and downpipes cleared€60–€200Done with the roof, it's at the low end

A guide for typical Limerick roofs. Your price is fixed by the company once they've seen the roof or your photos. Ask for it in writing, with VAT, the biocide and the gutters shown.

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Questions we get asked

How often should a roof be cleaned in Ireland?

Every three to five years for most Irish roofs, sooner on a north-facing or tree-shaded roof. A clean with a moss killer holds the moss back for one to four years.

How long does a roof clean last?

Yes, eventually. With a moss killer, a clean usually holds it back for one to four years. Without one, moss can be back within 6 to 9 months in the west of Ireland.

How long does it take to clean a roof?

A couple of hours to a full day on site, depending on the size of the roof and how much moss there is. The moss killer keeps working after: dead growth washes off with the rain over the following weeks.

Should I get a treatment every year?

Some people do, especially on shaded or tree-lined houses. A re-treat is €4–€10 per m², or from about €200 for a bungalow.

How much does a clean cost in Limerick?

Cleaning the roof of a 3-bed semi costs €400–€1,800 in Limerick, a terraced house or small semi €300–€1,200, and a detached house €450–€3,000+. Slate is dearer, €900–€3,500+. Clearing the gutters at the same time adds €60–€200.

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