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What does the NRCA recommend for step flashing in wood shingle roofing systems?

  1. A 5 inches wide by 10 inches long

  2. B 3 inches wide by 8 inches long

  3. C 6 inches wide by 12 inches long

  4. D 8 inches wide by 14 inches long

The correct answer is: B 3 inches wide by 8 inches long

The correct choice aligns with the typical recommendations made by the National Roofing Contractors Association (NRCA) for the installation of step flashing in wood shingle roofing systems. Step flashing is essential as it helps to direct water away from seams and prevents water intrusion, which is critical for maintaining the integrity of the roof and the underlying structure. The NRCA typically suggests dimensions that strike a balance between effective water management and practical installation considerations. A width of 3 inches provides sufficient overlap onto both the roof and the wall to create a watertight seal, while a length of 8 inches allows for proper integration into the wood shingle system, ensuring that the flashing is securely attached and properly directed to channel water away from potential entry points. The other options, while varying in size and providing different implications for performance, do not align with the established practices nor the balance of performance and practicality highlighted by the NRCA. The recommendation of 3 inches by 8 inches is regarded as optimal for ensuring that the flashing functions effectively without compromising the aesthetic or structural aspects of the roofing system.