The Perils of Cleaning Slate Roofs: Why It's a Job for the Experts
So, you have a slate roof and are exploring the best way to keep it clean? You're not alone.
As specialists in roof maintenance, we've cleaned many slate roofs over the years and have seen first hand the challenges and risks involved. While cleaning slate roofs may not be as frequently discussed as cleaning concrete or clay tiles, it is just as important—and requires a specialised approach.
In this blog post, we’ll delve into why cleaning slate roofs is not a DIY job and why you should consider hiring the professionals for this.....
Understanding the Nature of Slate Roofs
Slate tiles are known for their durability and aesthetic appeal, making them a popular choice for roofing.
However, they are not immune to the accumulation of dirt and moss, particularly in the joints between tiles where organic material can settle.
Unlike concrete or clay tiles, the smooth surface of slate makes it difficult for moss to adhere, which is why regular maintenance might seem less pressing.
But, it's crucial to recognise that there are various types of slate tiles, ranging from natural slate to man-made alternatives made from plastic, fiberglass, recycled materials, cement, or asphalt.
Identifying the type of slate is the first step in the cleaning process. Natural slates are not uniform in appearance, as they are a product of nature. In contrast, man-made slates often have a more uniform look. Some older properties may even have slate tiles containing asbestos, a hazardous material that requires specialised handling.
The Hidden Risks of Cleaning Slate Roofs
The most significant risk when cleaning slate roofs, especially for the inexperienced, is dealing with the coatings on man-made tiles. Over time, these coatings can deteriorate. If a roof is cleaned without taking this into account, the removal of dirt and biofilm can reveal a white, fibrous appearance underneath, indicating that the coating has failed. This exposure not only affects the roof's aesthetics but can also compromise its protective qualities.
Testing a small patch might seem like a prudent step, but it can be misleading. A test area that appears fine may not represent the condition of the entire roof. This can lead to unpleasant surprises post-cleaning, with the roof appearing patchy and discoloured.
Here at LevelFM we strongly recommend against treating man-made slate roofs without a thorough assessment. The unpredictability of the outcome makes it a risky venture. However, if a client insists and accepts the potential risks, we proceed with caution, using either a complete roof scrape followed by a biocide treatment or a steam clean, depending on the roof’s specific needs.
Safe Methods for Cleaning Slate Roofs
Natural slate can be brittle and crack easily, requiring a delicate touch. On the other hand, some man-made slates are more robust and can support more weight, such as that of a person using a roof ladder.
However, to ensure the utmost safety of your roof and our team, we prefer using specialised equipment like Mobile Elevated Work Platforms (MEWPs), telescopic poles and/or mobile access towers. This approach minimises the risk of damage to the roof.
The actual cleaning process involves using telescopic tools for scraping or steam cleaning. Steam cleaning is particularly effective as it is gentle yet thorough, ensuring that your roof is cleaned without damaging the tiles.
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Cleaning a slate roof is not a task to be taken lightly. It requires a detailed understanding of the materials involved, the condition of the roof, and the appropriate cleaning methods.
Here at LevelFM we have the expertise and equipment to handle these challenges safely and effectively. By choosing us, you can be confident that your slate roof will be cleaned with the utmost care, preserving its beauty and longevity.
If you're considering a roof cleaning, don't hesitate to contact us. Let the experts handle the intricacies, so you can enjoy a clean and pristine roof without the worry - click here for your free, no obligation quote and we'll be happy to help .
