Abstract: Method for producing a sound insulation component of the spring-mass type. Additions of heavy material are locally deposited on a layer of heavy material having a substantially constant thickness producing. The additions of heavy material form an excess thickness on said layer of heavy material having a substantially constant thickness, in order to form therewith a sound insulation layer having a variable thickness. Then, a resilient layer is deposited. The resilient layer forms a sound absorber on the sound insulation layer, and connecting the sound absorption layer and the sound insulation layer together.