Which of the following is a common insulation used on steel decks?

Perlite is commonly used as insulation on steel decks due to its lightweight properties and excellent thermal insulation capabilities. It is a natural volcanic glass that is processed to create a granular material, which helps to reduce heat transfer and improve energy efficiency in buildings. Perlite can also serve as a substrate for creating a flat roof, which is particularly beneficial for structures with steel decks. Its fire resistance and ability to withstand moisture make it a suitable choice for roofing applications, helping to prevent issues like corrosion in metal decks.

While expanded polystyrene, fiberglass, and cellulose are also used for insulation in various applications, they do not share the same properties as perlite when it comes to enhancing the performance of steel decks specifically. Expanded polystyrene is often used for its insulating properties, but it can be heavier and less fire-resistant compared to perlite. Fiberglass is commonly utilized in different types of insulation but is not as effective for flat roofing applications on steel. Cellulose is primarily used as an eco-friendly insulation material in attics and walls, not as a primary insulation on steel decks. Thus, perlite stands out as the most suitable and efficient option for this specific context.