Abstract: A sound-absorbing and fire-insulating wall covering includes, a cured mixture of: (i) 5-20% by weight mineralized wood fibre; (ii) 20-60%/by weight sand with an SiO2 content of less than 5% by weight and a greywacke content of at least 30% by weight; and (iii) 20-50% by weight cement. A method of preparing a fire-insulating wall covering includes a step of mixing, relative to the cured weight, 5-20% by weight mineralized wood fibre, 30-60% by weight sand with an SiO2 content smaller than 5% by weight and a greywacke content of at least 30% by weight, and 20-50% by weight cement. Then 10-30% by weight water is added. Thereafter the mixture is cured to form the fire-insulating wall covering.

Abstract: A noise-protection screen (1) provided with a number of sound-damping elements (2) and over the length of the noise-protection screen, spaced at a distance from each other with girders for the support of the elements, and a sound-damping element for a noise-protection screen. The noise-protection screen includes an air cavity (8) delimited at one side by the sound-damping elements (2) and at the other side by panel-like elements (9). At the side of the sound-damping elements the air cavity is preferably in contact with the surroundings by means of air openings, preferably in the form of air gaps running longitudinally along the noise-protection screen.