This is a common question we often receive from our clients, and the answer is… Some roof tiles, like slate and clay, can safely withstand pressure washing. However, older concrete tiles are typically more vulnerable and less suited to high-pressure cleaning. The reason is that pressure washing can damage the surface of certain tiles, making them more porous and prone to absorbing water. In some cases, the process can strip away the tile’s coloured top layer, exposing the raw concrete underneath — often a lighter beige or grey colour. This top coloured layer isn't just cosmetic — it usually serves as a water-repellent barrier. Once it’s worn away, the tile can hold more moisture, encouraging the growth of moss, algae, and other organic matter. That said, this natural weathering and erosion of the tile surface occurs over time anyway. You may notice when moss falls away naturally, a different shade of concrete becomes visible underneath. If you inspect the underside of moss or check your gutters, you might even spot small coloured granules from the worn tile surface. The ideal solution is to thoroughly clean the roof, removing all moss, algae, and biological growth. After cleaning, we recommend applying a coloured roof coating. This restores the roof’s uniform appearance and crucially reinstates the water-repellent properties that the tiles may have lost over time.

If a roof is left unattended in the British climate, moss and other organic growths are almost guaranteed to take hold. Not only is moss unsightly, but it also brings a range of problems. Moss doesn't just make your roof look untidy — it often falls onto patios, driveways, and garden areas, creating an endless cleaning chore. Worse still, it can block gutters and downpipes, increasing the risk of flooding around your home. Moss can also grow between roof tiles, lifting and dislodging them over time, which weakens the roof’s ability to protect your property. Plus, moss retains large amounts of water, putting unnecessary weight and pressure on your roof structure. During colder months, this trapped moisture can freeze, leading to cracked and broken tiles. As roofs naturally age, they become more vulnerable to damage caused by weather, moss growth, and general wear and tear. At LBC, we understand that every roof is different, and we tailor our cleaning approach to the specific material and condition of each one. Before any moss removal begins, we take great care to ensure the equipment and methods we use are safe and effective for your particular roof. We’ve successfully cleaned and treated roofs across areas like Wembley, Finchley, and Hampstead — always applying individual attention and care to every property we work on.

If you're looking for an instant, dramatic improvement to your roof’s appearance, pressure washing could be the ideal solution. However, it's important to remember that pressure washing isn't suitable for every type of roof — getting expert advice first can help you avoid causing irreversible damage. Pressure washing involves using high-powered water jets to blast away years of built-up dirt, moss, algae, and other debris. While highly effective, this method is only recommended for certain types of roof tiles, and only if the roof’s cement work is solid and in good condition. There are various ways to access your roof safely for pressure washing, depending on the property and the job requirements. In some cases, cherry picker hire, rope access systems, or traditional ladder setups may be needed to ensure safe and efficient cleaning. We also invest in industry-leading surface cleaning equipment, which allows us to deliver high-pressure cleaning with precision — helping to minimize mess and disruption while achieving outstanding results.

Yes, it is. Both the soft wash and jet wash roof cleaning procedures are absolutely safe for the covering material.

Our service will efficiently eliminate all moss & algae build-ups. Furthermore, the roofing material will have lasting protection from organic growth for years to come.

Yes, you can. This is a great way to vitalize your whole roof and prevent unwanted costly damages. Not only that but combining two or more services results in a 10% discount!