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How many nails are required for standard three-tab composition shingle installation?

The correct answer is: 4

For the installation of standard three-tab composition shingles, a total of four nails are typically required per shingle. This ensures that each shingle is securely fastened to the roof deck, providing adequate resistance against wind uplift and other forces. The use of four nails promotes better overall stability and helps prevent issues such as blow-offs during severe weather conditions. Using fewer nails might compromise the shingle's integrity and increase the risk of failure, while using more than four can also be unnecessary and may lead to other problems, such as damage to the shingles or improper installation. Thus, the requirement of four nails strikes a balance between durability and efficiency for proper roofing installation.