Concrete tile blistering occurs when small bubbles or raised areas form on the surface of the tiles, usually due to trapped moisture or air pockets during the manufacturing process or improper curing. This can also happen if the tiles are exposed to excessive heat or water infiltration over time, causing the concrete to expand and contract unevenly. While blisters can be unsightly, they don’t always affect the tile’s structural integrity immediately. However, they can lead to premature wear and potential cracking if left unchecked. Homeowners may notice bubbling or peeling on tiles, especially in areas with direct sun exposure or poor ventilation. To diagnose, gently press on the blistered area; if it feels hollow or soft, it might signify underlying damage or moisture issues.
For a safe DIY check, walk around your roof using binoculars to look for visible bubbling or discoloration without climbing, as slipping on tiles can be dangerous. If you're comfortable, a close visual inspection from a sturdy ladder can help spot problem spots, but avoid stepping on tiles to prevent breaking them. It’s wise to call a professional if the blistering covers large areas, tiles feel loose, or you see cracks around the blisters, especially if your roof is still under warranty. When consulting a roofer, ask specifically: "How will you determine if the blistering affects the roof’s integrity or warranty coverage?" and "What long-term repairs or replacements do you recommend to prevent further blistering?" Clear answers will ensure your roof lasts and that any work complies with warranty guidelines, keeping your home protected.