In sawn or glue-laminated floors, if planks are a minimum of 4" in width, they must be covered with:

For sawn or glue-laminated floors where the planks are a minimum of 4 inches in width, covering requirements specify that the flooring must be complemented with either a 15/32" wood structural panel or 1/2" particleboard. This requirement ensures that the floor system has adequate rigidity, stability, and load distribution characteristics.

Using a wood structural panel provides additional strength while helping to prevent deflection and increase overall flooring durability. The same goes for particleboard, which adds a solid base that can support various finishes and improve thermal properties. Both options are valid, giving flexibility in material choice based on project needs or availability. Hence, choosing either option satisfies the code requirements, making the selection of either material acceptable. This is why the answer encompasses both materials as suitable solutions for the flooring coverage specified.