Aluminum roofing is prized for its durability and lightweight properties, but over time, it can experience granule loss, which refers to the wearing away or peeling off of the protective granule layer on roofing material, often associated with shingles rather than pure aluminum roofs. When aluminum roofing includes granule-coated surfaces or is combined with granule-surfaced shingles, exposure to harsh weather, UV radiation, and physical abrasion often leads to granule loss. This happens because the granules act as a protective shield, absorbing sunlight and preventing the underlying material from deteriorating. If granules wear away, the roof’s surface becomes vulnerable to rusting, fading, and accelerated aging. You can do a simple check by visually inspecting your roof from the ground with binoculars or safely from a ladder, looking for bald patches where granules are missing or an excess of granules in your gutters or downspouts. If you notice these issues early, you might consider applying a specialized roof coating to extend the life of your roof, but avoid attempting any treatment without confirming your specific roofing material's compatibility and warranty restrictions.
If you see significant granule loss or suspect related damage, it’s wise to call a professional roofer for a thorough inspection, especially since granule loss on aluminum roofing might also point to underlying factors such as metal corrosion or inadequate installation. Ask the contractor about their experience with aluminum roofs and granule-coated materials, and whether their proposed solutions comply with your roof’s warranty terms. A useful question is, “How will your repair or replacement method protect my roof from future granule loss and weather damage?” Also, inquire about any impact on the existing warranty and if they provide maintenance options to prevent similar issues down the road. While some minor granule loss may be manageable by a skilled DIYer, real repairs often require specialized materials and expertise to maintain the roof’s integrity and long-term durability.