Roof Cleaning
Cleaning your roof is an essential part of home maintenance. Over time, roofs can accumulate dirt, moss, algae, and other debris, which not only compromise the aesthetic appeal of your home but also pose potential risks to its structural integrity. In this comprehensive guide, we will explore the best and safest methods for roof cleaning to ensure that your roof stays clean, attractive, and free from damage.

Why is Roof Cleaning Important?

Before delving into the various methods of roof cleaning, let’s understand why it is crucial to maintain a clean roof. Over time, roofs can become covered in moss, algae, and other organic growth. These substances not only compromise the appearance of your roof but can also lead to significant damage if left untreated. Moss, in particular, can be a major problem for roofs. It has the ability to store large amounts of water, which can apply direct pressure on your roof, causing areas to cave in and leading to water damage inside your home. Additionally, moss can grow under your roof tiles, resulting in dampness and the growth of mould and mildew inside your property. Algae and mould, on the other hand, can impact the structural integrity of your roof. They can cause shingles to deteriorate, leading to leaks and potential water damage. Moreover, the presence of mould can pose health risks, especially for individuals with respiratory issues or weakened immune systems. Regular roof cleaning not only prevents damage and prolongs the lifespan of your roof but also enhances the overall curb appeal of your home. A clean roof adds value to your property and creates a positive first impression for potential buyers.

Choosing the Right Roof Cleaning Method

When it comes to roof cleaning, there are several methods available, each with its own advantages and disadvantages. Let’s explore the most commonly used methods and discover which one is best suited for your needs.

Manual Scraping

Manual scraping is a simple yet effective method of cleaning roof tiles. It involves physically removing moss, algae, and dirt by hand. While this method can be time-consuming, it allows for precise cleaning, ensuring that every nook and cranny is addressed. To manually scrape your roof, start by carefully removing the larger deposits of moss and algae using a hard-bristled brush or scraper. Take caution not to damage the roof tiles in the process. Once the bulk of the debris has been cleared, you can proceed with a gentler method to remove the smaller particles.


Softwashing, also known as bleach cleaning, is a popular method used after manual scraping to achieve an instant clean. It involves the application of a bleach solution that kills remaining organisms and lifts surface dirt from the tiles. However, it is important to note that soft washing should be approached with caution due to potential harm to the environment and surrounding areas. While soft washing can provide a uniform clean, there are concerns about the use of bleach and its impact on plants, animals, and other surfaces. The chemical solution used in soft washing can be carried by the wind and may cause harm if it comes into contact with garden plants, furniture, wooden frames, or convertible car roofs. Proper care and control are essential when opting for soft washing as a roof cleaning method.

Roof Steam Cleaning

Roof steam cleaning is a safe and effective method for certain types of roof tiles. It involves the use of low-pressure steam, heated to approximately 140 degrees, to lift and remove dirt and organic growth. Steam cleaning provides immediate and visible results, leaving your roof beautifully clean. Before considering roof steam cleaning, it is crucial to assess the suitability of your roof tiles for this method. Some tiles may not withstand the high temperatures or pressure associated with steam cleaning. Consult with a professional to determine if steam cleaning is a viable option for your roof.

Biocidal Roof Wash

Biocidal roof wash is a popular and gentle method of roof cleaning. This method involves manual roof moss removal followed by the application of a biocidal wash. The biocide kills any remaining organisms, including moss spores and lichen, and repels future moss growth for an extended period. First, the roof moss is manually scraped from the tiles to remove the bulk of the growth. Then, a biocidal roof wash is applied to eliminate any remaining living organisms and promote the restoration of the roof’s original colour. Over time, the biocide combined with weathering lifts surface dirt from the tiles, leaving your roof clean and protected for years to come. The biocidal roof wash method is highly recommended for its long-lasting results and minimal risk of damage to your roof. It is best performed by professionals using cherry pickers or mobile access towers for safe and efficient cleaning.

The Cleaning Process: Step-by-Step Guide

Now that we’ve explored the different roof cleaning methods, let’s dive into the step-by-step process of cleaning your roof effectively and safely.

Step 1: Assess the Condition of Your Roof

Before initiating the cleaning process, it is crucial to assess the condition of your roof. Look for signs of moss, algae, mould, or any other growth. Identify areas that may require extra attention or potential damage that needs to be addressed before cleaning.

Step 2: Prepare the Surrounding Area

Roof cleaning can be a messy process, so it is important to prepare the surrounding area. Remove any patio furniture, garden ornaments, or other items that may obstruct the cleaning process. Cover delicate landscaping with a tarp to protect them from cleaning solutions or debris.

Step 3: Wear Protective Gear

Before starting the cleaning process, ensure that you are wearing appropriate protective gear. This includes gloves, goggles, and a face mask to protect yourself from harmful chemicals and debris.

Step 4: Manual Scraping

If manual scraping is part of your chosen cleaning method, begin by using a hard-bristled brush or scraper to remove the larger deposits of moss, algae, and dirt. Take care not to damage the roof tiles in the process. Pay special attention to areas with heavy growth or hard-to-reach spots.

Step 5: Apply Cleaning Solution

If you are using a cleaning solution, follow the instructions provided by the manufacturer. Apply the solution to the roof using a sprayer or soft washer, ensuring even coverage. Take caution not to oversaturate the roof, as excessive moisture can lead to damage.

Step 6: Let the Solution Sit

Allow the cleaning solution to sit on the roof for the recommended amount of time, as stated in the instructions. This will give the solution sufficient time to break down and lift dirt, algae, and other organic growth.

Step 7: Rinse Thoroughly

After the appropriate waiting period, thoroughly rinse the roof with clean water. Use a garden hose or a low-pressure sprayer to remove the cleaning solution and any remaining debris. Start from the top of the roof and work your way down, ensuring that all areas are adequately rinsed.

Step 8: Post-Cleaning Care

Once the cleaning process is complete, inspect the roof for any missed spots or areas that require additional attention. Touch up these areas as needed, ensuring that your roof is clean and free from debris.

Health and Safety Considerations

While roof cleaning is essential, it is important to prioritise health and safety throughout the process. Here are some key considerations to ensure a safe cleaning experience:
    • Use appropriate protective gear, including gloves, goggles, and a face mask, to protect yourself from chemicals and debris.
    • Avoid cleaning your roof on a sunny day, as the cleaning solution may evaporate too quickly, limiting its effectiveness. Choose a cloudy, calm day with no threat of precipitation.
    • Take precautions when walking on your roof. Ensure that the surface is dry, wear slip-resistant shoes with rubber soles, and secure yourself with a safety harness if necessary.
    • Be mindful of nearby landscaping and surrounding areas. Wet plants and shrubbery thoroughly with plain water before applying any cleaning solution to protect them from potential harm.
    • Follow the instructions provided by the manufacturer for any cleaning solutions or chemicals used. Always handle them with care and store them properly.
    • If you are uncomfortable with heights or your roof has a steep slope, consider hiring a professional roof cleaning service to ensure your safety.

Roof Maintenance and Prevention

In addition to regular cleaning, there are several preventive measures you can take to maintain the cleanliness and longevity of your roof:
    • Trim back overhanging branches to prevent excessive shade and moisture buildup on your roof.
    • Clear debris, such as leaves and branches, from your roof regularly, especially after storms or high winds.
    • Keep your gutters clean and free from blockages to ensure proper water drainage and prevent water damage to your roof.
    • Consider installing zinc or copper strips along the ridge of your roof. These metals release ions that inhibit the growth of moss and algae.
    • Schedule regular roof inspections to identify and address any potential issues before they become major problems.
By following these preventive measures and incorporating regular roof cleaning into your maintenance routine, you can ensure that your roof remains clean, attractive, and in good condition for years to come.


Roof cleaning is an essential aspect of home maintenance that should not be overlooked. By keeping your roof clean and free from moss, algae, and other debris, you can prolong its lifespan, prevent potential damage, and enhance the overall appearance of your home. Choose the cleaning method that best suits your roof’s needs and follow the step-by-step process outlined in this guide to ensure safe and effective cleaning. Prioritise health and safety throughout the process, and consider hiring professionals for challenging or high-risk cleaning situations. Remember, regular roof cleaning and preventive maintenance are key to preserving the integrity and beauty of your roof. By taking these proactive measures, you can enjoy a clean, attractive, and long-lasting roof for years to come. If you require professional roof cleaning services, contact Newcastle Roofers, the trusted experts in roof maintenance and repair in the Newcastle area. Keep your roof in top condition with their reliable and professional services.