Aluminum roofs and skylights can develop leaks for several reasons, often related to how water interacts with the materials and installation. Aluminum can expand and contract with temperature changes, which may cause sealants around joints and fasteners to crack or peel over time. Skylight leaks often arise where the frame meets the roof or where flashing was improperly installed or has deteriorated. Moisture may enter through gaps caused by worn-out seals, damaged flashing, or poor waterproofing. These leaks are more common after storms, heavy rain, or strong sun exposure, which puts stress on roofing materials. Simple diagnostics include inspecting the skylight frame for visible cracks or gaps, checking the condition of the aluminum panels near the skylight for separation or damage, and looking for water stains or drips inside the home during or after rain.
Homeowners can safely perform some basic checks by gently running water over the skylight and aluminum seams with a garden hose to see if leaks occur, but avoid walking on an aluminum roof unless properly trained to prevent damage. Look for failed sealant or loose fasteners around skylight edges and aluminum joints, and consider resealing small gaps with a high-quality, roof-approved silicone or polyurethane sealant as a temporary fix. However, because skylights require precise flashing and waterproofing techniques, it's wise to call a roofer if leaks persist or if large or structural repairs seem needed. When consulting a contractor, ask if they have experience working with aluminum roofing and skylight installations and whether their repair methods meet manufacturer recommendations to avoid voiding warranties. Also, clarify if they use compatible sealants and flashing materials designed to withstand the expansion of aluminum to ensure a long-lasting leak repair.