North Carolina Building Contractor License Practice Exam

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What is the minimum thickness for plywood used as roof sheathing?

3/8 inch
1/2 inch
5/8 inch
3/4 inch

The correct answer is: 5/8 inch

The minimum thickness for plywood used as roof sheathing is 5/8 inch. This thickness is specified to ensure adequate strength and durability to support the roofing materials and withstand environmental stresses, such as wind and snow loads. A thickness of 5/8 inch provides a balance between structural integrity and the weight of the material, allowing for effective performance without excessive weight on the rafters or trusses. Additionally, building codes and guidelines often reflect this minimum requirement to safeguard the overall performance of the roofing system. Choosing plywood that meets or exceeds this thickness is crucial for maintaining the longevity and safety of the structure. The other thickness options are either below the recommended minimum or more suitable for different applications, making 5/8 inch the proper standard for roof sheathing in most cases.