Which of the following is commonly used for replacing older types of sheathing?

Rigid polystyrene insulating board is commonly used for replacing older types of sheathing because it provides excellent insulation properties along with structural support. This insulation helps to improve energy efficiency in buildings by reducing heat loss in the winter and keeping interiors cooler in the summer. The lightweight nature of rigid polystyrene makes it easy to handle and install, and it can serve as a moisture barrier when used properly.

This type of board also has a smooth surface that can be easily finished with various exterior materials, enhancing both durability and aesthetics of the building envelope. In contrast, while other materials listed may offer some benefits, they are not typically used as direct replacements for traditional sheathing in the same way that rigid polystyrene is. For instance, vinyl siding is primarily a cladding material and not used as sheathing, fiber cement board serves more as an exterior finish than a sheathing layer, and metal sheathing, while strong, is not as commonly used for insulation compared to polystyrene.