Method for manufacturing a formed body with a cavity structure for sound and/or heat insulation and formed body for sound and/or heat insulation

A method for manufacturing a formed body with a cavity structure for the sound and/or heat insulation of buildings, wherein pre-foamed polystyrene particles are compressed into a formed body in a mould or on a conveyor belt system under the influence of pressure and/or heat, comprising:

• coating at least part of the pre-foamed polystyrene particles with an organic or inorganic binder prior to the compression in a mould or on a conveyor belt system,
• wherein the compression takes place prior to the complete curing of the binder, and
• wherein the degree of compression amounts to 0.2-0.8, such that a communicating cavity volume is preserved in the formed body.