North Carolina Building Contractor License Practice Exam

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Which of the following is not approved for attaching asphalt shingles?

Metal fasteners
Roofing nails
Staples
Plastic caps

The correct answer is: Staples

Staples are typically not approved for attaching asphalt shingles due to their potential to fail under various weather conditions. Asphalt shingles are designed to be securely fastened to the roof to prevent wind uplift and moisture infiltration. Roofing nails, metal fasteners, and plastic caps are specifically designed to provide the necessary holding power and are less likely to come loose over time, ensuring the longevity of the roof. Nails suitable for roofing have a larger head to grip the shingles securely and penetrate the underlying material effectively, while plastic caps can enhance the holding power by distributing pressure across a wider area. In contrast, staples may not provide sufficient strength or hold against high winds, leading to an increased risk of shingles lifting and potential damage. Therefore, using staples is discouraged in roofing applications to maintain structural integrity and weather resistance of asphalt shingles.