Catalina Foothills, Ariz. – September 30, 2026 -- Hairline cracks on a clay or concrete tile roof might look harmless, but roofing professional Drew Nelson of Apex Roof Pros LLC says they can quietly let water reach the underlayment beneath the tiles, weakening a roof's waterproofing over time.
In Tucson's dry, high-heat climate, daily temperature swings cause tiles to expand and contract, a cycle Nelson says gradually widens existing cracks and adds stress to the roof system.
