Vinyl siding installation over existing materials depends on the current siding’s condition and type. If existing siding is structurally sound, level, and moisture-free, installation over it can reduce project costs by eliminating removal expenses.However, installing over damaged, warped, or moisture-compromised siding creates problems affecting new installation performance and appearance. Wood siding with rot, dented aluminum, or any material with underlying moisture issues must be removed to prevent future problems.We evaluate structural integrity, moisture conditions, and surface preparation requirements to recommend the best approach for your specific situation and long-term results.