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Sandwich panels

These are made using a layer of insulation between two metallic panels, and are used to insulate buildings. For modular structures, 2 types of sandwich panel are most frequently used:

- a version comprising sheet steel panels separated by polyurethane foam. This has the advantage of a light weight and good insulation properties.

- a version with an insulating core made from mineral wool. This provides better fire protection, but requires a greater thickness in order to provide the same insulation coefficient.

Note: Also available are sandwich panels with a perforated inner metal sheet, used to improve building acoustics.