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Yes, professional roofers can retrofit a drip edge onto an existing roof, although this approach costs more than installing one during a complete roof replacement. The process requires carefully lifting existing shingles to properly position the drip edge flashing. Most roofing professionals recommend incorporating a drip edge during planned roof replacement projects when possible. The investment remains worthwhile even on existing roofs when considering the potential cost of water damage from inadequate roof edge protection.

Many jurisdictions have adopted building code provisions requiring drip edge installation, following International Residential Code standards. Requirements vary between municipalities, so consult with local building authorities and your licensed roofing contractor. Even in locations without explicit mandates, roofing industry best practices strongly recommend drip edge installation as an essential component of proper roof system design and water management.

Without proper drip edge protection, water can penetrate between the roof decking and fascia boards, promoting wood rot, mold growth, and structural deterioration over time. Visual indicators of water infiltration include staining, warping, or premature deterioration of fascia components. Some manufacturers specifically require drip edge installation to maintain roof warranty coverage. The cost of proper drip edge installation is worth it when compared to potential repair expenses resulting from water damage.