Concrete tiles are durable roofing materials known for their strength and longevity, but over time, exposure to ultraviolet (UV) rays from the sun can cause degradation. UV radiation breaks down the surface of concrete tiles, leading to fading, chalking, and sometimes small surface cracks. This weathering happens because the sun’s rays degrade the cement and aggregate materials in the tile’s surface, weakening the protective layer that keeps the tile resilient. While this process is gradual, it becomes noticeable after many years, especially in regions with intense sunlight. Simple diagnostics for UV damage include checking for discoloration, a powdery surface feel (called chalking), or hairline cracks on tiles. A safe DIY check involves gently rubbing a white cloth over the tile surface; if it becomes dusty or chalky, UV degradation is likely affecting the tile’s finish.
Addressing UV degradation on concrete tiles usually involves either washing and resealing the tiles or, in more severe cases, replacing worn tiles. Cleaning with a mild detergent and water can remove surface chalking, followed by application of a high-quality, UV-resistant concrete sealer to restore protection. Sealers help defend against further UV damage and water absorption but must be compatible with the tile’s original materials and applied according to manufacturer guidelines to avoid voiding any warranties. If the tiles are extensively cracked or crumbling, it’s best to call a professional roofer to assess the damage and recommend repairs or replacement. When hiring a contractor, ask if they use sealers specifically formulated for concrete tiles that maintain warranty compliance and how they ensure uniform application for long-term protection. Another important question is whether their repair method includes inspecting the roof’s underlayment, which can also be impacted by UV-related tile failure.