Remove Moss Off Roof

clean moss off roof
May 19, 2024

As time passes, your roof becomes a silent witness to the elements, accumulating layers of dirt, moss, and algae. However, neglecting its maintenance can lead to severe consequences, including damp issues and compromised structural integrity. To ensure your home remains free from moisture-related problems and your roof functions efficiently, regular cleaning is essential. We recommend scheduling roof cleaning every three to five years, although the frequency may vary based on the rate of moss and lichen accumulation, particularly in areas shaded by large trees or buildings.

At Myroofclean, we understand the significance of maintaining a clean and healthy roof, and we’re here to guide you through the process. Below, we outline various roof cleaning methods, including the most effective approaches and why pressure washing should be avoided.

Roof Cleaning Methods: Exploring Your Options

  1. Manual Scraping: This traditional method involves manually removing moss, algae, and dirt from roof tiles. It’s a straightforward yet effective approach that ensures thorough cleaning without causing damage.
  2. Roof Pressure Washing: While pressure washing may seem appealing due to its affordability, it’s often the riskiest option. The high-pressure water jet can damage roof tiles, strip away protective coatings, and potentially lead to leaks or costly repairs.
  3. Softwashing / Bleach (Hypo): Softwashing involves using bleach to clean the roof after manual scraping. While it can provide instant results, the airborne sodium hypochlorite poses risks to the environment and surrounding surfaces, including plants and wooden structures.
  4. Roof Steam Cleaning: Steam cleaning, when carried out safely on compatible roof tiles, offers a gentle yet effective cleaning solution. It involves low-pressure steam and can leave your roof looking immaculate without causing damage. This method of roof cleaning should consistently utilize minimal pressure, accompanied by a low flow rate averaging between 6 and 10 litres per minute, heated to approximately 140 degrees.
  5. Biocidal Roof Wash: This method combines manual roof moss removal with the application of a biocidal solution to inhibit future moss growth. It’s a popular choice due to its long-lasting results and minimal environmental impact.

The Best Approach to Roof Cleaning

moss on roof

At Myroofclean we’ve developed a comprehensive cleaning method that maximizes effectiveness while minimizing risks. We start with manual scraping to remove debris, followed by gentle steam cleaning to eliminate smaller particles. Finally, we apply a biocidal solution to prevent future moss growth and ensure long-lasting cleanliness.

Why Pressure Washing Should Be Avoided

While pressure washing may seem like a quick fix, there are significant drawbacks that outweigh its benefits:

  1. Risk of Damage: High-pressure water jets can crack older tiles or remove factory finishes, leading to premature tile replacement and costly repairs.
  2. Water Ingress: Pressure washing poses the risk of water entering the roof/loft space through small cracks or weaknesses in the tiles or felt, potentially causing further damage.
  3. Warranty Concerns: Using a pressure washer may void any existing warranties or guarantees, leaving you vulnerable to future issues without adequate protection.


Maintaining a clean roof is vital for the health and longevity of your home. By choosing gentle yet effective cleaning methods and avoiding pressure washing, you can ensure your roof remains in optimal condition for years to come.