There is no perfect material. There is material that is used correctly or incorrectly.
Both rock wool and polystyrene are used to insulate houses. The choice depends on the project, facade system, and construction conditions.
Price: rock wool is usually more expensive, while polystyrene is more affordable.
Fire resistance: rock wool has very good fire resistance. Polystyrene is more sensitive to high temperatures and fire.
Moisture: rock wool requires proper protection and installation. With polystyrene, moisture resistance depends on the type of material and the system used.
Installation: rock wool requires more attention during fixing and installation. Polystyrene is generally easier to install.
Insulation: both materials can provide good thermal insulation. Rock wool also offers good acoustic insulation properties.
There is no universal solution. The choice should be based on the type of construction, facade system, budget, and insulation requirements. The most important thing is that the material fits the project and is installed correctly. Even a good material can perform poorly if it is used incorrectly.
