Clay tiles are a beautiful and durable roofing option, but like all materials, they can be affected by UV degradation over time. UV rays from the sun gradually break down the surface of clay tiles, causing them to lose their color and develop a faded, chalky appearance. This happens because the intense sunlight causes the natural pigments and the clay’s surface glaze to deteriorate. In some cases, UV exposure can also weaken the tile surface, making it more porous and susceptible to cracking or spalling in extreme climates. While clay tiles are designed to last for decades, strong, prolonged UV exposure, especially in hot, sunny climates, can accelerate the aging process. You can do a simple visual check from the ground or a ladder: look for dull, powdery surfaces or spots where the glaze has worn away. If you see signs of chalking or significant color loss, wear gloves and gently rub the tile surface; if chalky residue comes off on your fingers, that’s a sign of UV damage.
If you notice UV degradation, a few safe DIY steps can help slow the process. Cleaning the roof with water and a soft brush to remove dirt and debris will prevent buildup that worsens wear. Applying a clear roof tile sealant designed for clay tiles can restore some water resistance and protect against minor UV damage, but always choose products that won’t void your tile’s warranty or cause chemical damage. Since working on clay tile roofs can be risky due to their weight and fragility, it's best to know your limits. If you spot cracked or heavily worn tiles, or if you’re unsure about sealants, call a professional roofing contractor with experience in clay tiles. Ask them “How does the tile type on my roof handle UV exposure?” and “What are the best maintenance or repair options that won’t void my warranty?” A good roofer can advise you on specialized coatings or partial tile replacements to keep your roof performing well and looking great for years to come.