Which type of insulation is classified as a flexible insulation?

Open-cell foam is classified as a flexible insulation because it features a structure that allows it to easily compress and conform to various shapes. This flexibility makes it ideal for applications where a tight fit around irregular surfaces is necessary, such as in walls or ceilings with numerous obstacles. Additionally, open-cell foam is lightweight and has good sound absorption properties, further enhancing its effectiveness in specific installation contexts.

In contrast, fiberglass tends to be rigid and is typically used in batt or board form, making it less adaptable than open-cell foam. Mineral wool is also relatively rigid and provides fire-resistance benefits but lacks the flexibility needed for various installation configurations. Polystyrene, which can come in both expanded and extruded forms, is generally stiff and does not offer the same level of flex as open-cell foam. This characteristic distinction is crucial when choosing insulation types for specific projects, especially when flexibility is a key requirement.