Slate roofing is known for its durability and natural beauty, but even this tough material can suffer from UV degradation over time. UV rays cause the surface of the slate to slowly break down, leading to fading, surface roughness, and eventually small cracks or flaking. This usually happens because the protective mineral coating on the slate wears away after prolonged sun exposure, especially in hot climates or areas with intense sunlight. To check your slate roof for UV damage, look for uneven discoloration, chalky residue on the tiles, or brittle edges. These signs indicate the slate is losing its protective surface and becoming more vulnerable to weather damage.
For a safe, simple DIY check, walk your roof if accessible and visually inspect the slates closely. Avoid walking on brittle or cracked slates to prevent further damage. If you find signs of UV degradation, it’s a good idea to call a professional roofer who specializes in slate. They can assess whether the damage is cosmetic or structural and discuss repair or replacement options. When speaking with your contractor, ask if they have experience working specifically with slate and how they recommend protecting your roof moving forward. Additionally, inquire about any warranty implications of repairs or treatments like sealants designed to restore UV resistance, ensuring your fixes won’t void existing guarantees.