North Carolina Building Contractor License Practice Exam

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What is the required end lap for the underlayment of asphalt shingles?

1 inch
2.5 inches
3 inches
4 inches

The correct answer is: 2.5 inches

The required end lap for the underlayment of asphalt shingles is typically specified as 2.5 inches. This measurement ensures a proper overlap that helps prevent water infiltration and contributes to the overall durability and weather resistance of the roofing system. The end lap acts as a key component in directing water away from the seams and joints of the roofing material, thus minimizing potential leaks and enhancing the longevity of the roof. Adequate lap coverage is essential to maintain compliance with building codes and manufacturer specifications, ensuring that the roofing assembly performs effectively under various weather conditions.