If poorly-bonded shingle tabs can be lifted without damage, what action can you recommend?

Hand-sealing the shingles is the most practical recommendation in this scenario because it directly addresses the issue of poorly-bonded tabs that can be lifted without causing any damage. This action involves applying roofing adhesive to the tabs of the shingles, which helps secure them more firmly to the underlayment and prevent future problems, such as water infiltration or wind damage.

This approach is cost-effective and less invasive compared to replacing the shingles or resealing the entire roof, which can be both time-consuming and expensive. Hand-sealing targets the specific problem of loose tabs and can help extend the life of the roof without needing a full-scale repair. Additionally, this solution is a proactive measure that can prevent further deterioration.

Informing the homeowner only does not provide a practical solution to the issue at hand and fails to address the potential risks associated with the poorly-bonded shingles. Thus, hand-sealing stands out as the most appropriate recommendation.