In what size and thickness is mineral wool board available?

Mineral wool board is commonly available in a size of 2'x4' and thickness ranges from 1 to 4 inches. This specific size and thickness are practical for various insulation needs, allowing for flexibility in installation and application across different construction projects. The dimensions of 2'x4' are particularly favorable as they align well with standard framing practices, making them easier to handle and fit into walls, ceilings, or other structural elements. The thickness range of 1 to 4 inches allows for adjusted R-values, enabling builders and contractors to choose the suitable insulation level for thermal performance based on their requirements. This makes option B the most accurate representation of the typical sizing available for mineral wool board.