Aluminum roofing and siding are popular for their lightweight and durable nature, but over time, blisters can form on the surface, causing aesthetic and potential functional issues. Blistering happens when trapped moisture or air beneath the aluminum’s protective coating expands due to heat, causing the coating to bubble or peel. This can be a result of poor installation, inadequate ventilation, or exposure to excessive moisture during or after installation. Simple diagnostics include a visual inspection for bubbles, raised areas, or paint peeling, especially after hot sunny days or rainy periods. Running your hand over suspicious spots can help you identify soft or peeling areas, but avoid pushing too hard to prevent damage. If small blisters appear, sometimes gentle sanding and repainting with appropriate coatings designed for aluminum can stabilize the surface. However, if blisters are widespread or the aluminum is severely warped or corroded, professional intervention is advisable.
When doing DIY checks, make sure to observe the condition of seals around seams and fasteners where moisture can infiltrate and cause blistering. Check for loose panels or damaged flashing that may be letting water in. It is important to avoid using harsh chemicals or abrasive tools that might damage the aluminum. If the blistering is extensive or if you notice rust spots on non-aluminum parts, it is a good idea to call a roofer or siding specialist. When you contact a contractor, ask if they have experience with aluminum surfaces and whether they use coatings that are compatible with aluminum warranties. Another useful question is how they plan to address moisture issues to prevent future blistering and whether they provide a guarantee on their repair work. Proper evaluation and repair can extend the life and appearance of your aluminum roofing or siding.