Building element and method of manufacturing such element

A method of manufacturing a structural element having improved sound and/or vibration dampening capacity and being composed of a first support plate and a second support plate having therebetween spaced layers of a viscoelastic material, comprising

• applying several spaced strings of a viscoelastic synthetic damping material in liquid form, having a good adhesive activity in a thickness of 1-5 mm, a width of 50-500 mm and spaced from each other by a distance of 50-500 mm on the upper surface of a first support plate,
• allowing said liquid viscoelastic material to polymerize,
• applying a second thin layer of a viscoelastic synthetic glue in liquid form on top of the strings of polymerized viscoelastic material,
• pressing a second support plate onto the second layer of viscoelastic material,
• allowing the second glue layer to polymerize thereby forming an integral three-part structural element,
• and finally applying a mat of natural or synthetic felt material of a predetermined product weight, and a predetermined thickness, over the surface of the structural element so as to face the surface onto which the element is to be fastened;
• trimming and cutting the structural element.