One aspect of the disclosure is a plaster board having a first edge and an opposed second edge, and a third edge and an opposed fourth edge. The plaster board includes a first layer of hardened plaster material including a first surface and an opposed second surface, and a second layer of hardened plaster material including a first surface and an opposed second surface. The second layer of hardened plaster material is stacked against the first layer such that their first surfaces face one another. The first layer and the second layer together define the first, second, third, and fourth edges of the plaster board. The plaster board also includes a viscoelastic polymer disposed between the first surfaces of the first and second layers of hardened plaster material. The viscoelastic polymer does not extend substantially to the first, second, third, and fourth edges of the plaster board.

A multi-layered structure (1) for the production of a floor or wall covering. The structure comprises: a first assembly (E) successively comprising at least: a transparent wear layer (E1) made of polyvinyl chloride; a decorative layer (E2) bonded to the wear layer (E1); a backing layer (E3), bonded to the decorative layer (E2), produced from plasticized and loaded polyvinyl chloride; a foam layer (2), bonded to the backing layer (E3), imparting sound-insulating properties to the structure, and having a lower side. The first assembly (E) comprises a tensile modulus for 1% elongation greater than 5 MPa, and a flexural modulus at 3.5% between 10 MPa and 20 MPa and the foam layer (2) is a cross-linked polyolefin foam layer, having a thickness between 0.5 mm and 2 mm, and a density between 60 kg/m.sup.3 and 120 kg/m.sup.3.

An acoustic insulation product includes a panel made of porous material, based on foam or fibres, including a first face, referred to as back face, intended to face towards a wall, and a second face, referred to as front face, situated on the opposite side to the back face, and a layer, referred to as backing layer, which adheres to or is linked or coupled at least in part to the back face of the panel made of porous material, the backing layer having an airflow resistance of between 5 kPa.Math.s/m and 20 kPa.Math.s/m.

Transparent or translucent sound diffusers include a first glass sheet of less than 0.8 mm thickness and a second glass sheet of less than 0.8 mm thickness with a transparent or translucent adhesive layer there between, the adhesive layer adhering the first and second sheets in a fixed configuration such that a first major surface of the first glass sheet has a smooth, repeatedly rising and falling shape. The diffusers are secured to a wall or ceiling or to a wall or ceiling mount or to a wall or ceiling panel.

A sound insulation tile having a tile body and a sound insulation layer on a back surface of the tile body and used for buildings and a method of manufacturing the same are revealed. The sound insulation layer is made of unfoamed or foamed PU material containing special substances. A method of manufacturing sound insulation tiles includes the steps of preparing a plurality pieces of sound insulation layer whose size matches size of a tile body and then attaching the sound insulation layer to a back surface of the tile body by an adhesive layer. Another method of manufacturing sound insulation tiles includes the steps of coating thick PU material over a back side of a tile body to form an even sound insulation layer integrated with the tile body, and then curing the sound insulation layer for mass production of the sound insulation tile.

An assembly forming an acoustic insulator having a first sheet, a pierced second sheet, and a plurality of first and second structures. Each first structure comprises a first and a second strip, wherein each is shaped to form half of the wall of a cage and wherein, for two successive halves, each strip comprises a facet of a joining wall. Each second structure is made up of a first and a second strip, wherein each is shaped to form half of the wall of a cone, wherein. For each strip, at least one of the wall halves of each cone is pierced. For two successive halves, each strip comprises one facet of the connecting wall. Each cone is located in a cell and each connecting wall is located between the two facets of a joining wall, and, between two adjacent first structures, a second structure is likewise fitted.

Described herein is an acoustic building panel comprising: a body comprising a fibrous material and having a first major surface opposite a second major surface and a side surface extending there-between, the fibrous material comprising polyester fiber in an amount of at least 70 wt. % based on the total weight of the fibrous material; wherein the body has a bulk density as measured between the first major surface, the second major surface, and the side surface, the bulk density ranging from about 4.8 lb./ft.sup.3 to about 6.0 lb./ft.sup.3.

Described herein is a building panel and related building systems, the building panel having a first major surface opposite a second major surface, the building panel comprising a core comprising a first body comprising a first fibrous material; and a second body comprising a second fibrous material, a veneer facing layer coupled to the core, the veneer facing layer comprising a plurality of perforations.

A sound absorbing panel assembly comprising the woven basalt material. The sound absorbing panel assembly comprises a height, a width, a length, a cover and an absorbent panel. The cover comprises a woven basalt material. The absorbent panel comprises a sound absorbent acoustic panel. The absorbent panel is covered by the cover.

To provide a sound insulation sheet member which is excellent in sound insulation performance in a low frequency band and which has a compact configuration. A sound insulation sheet member 1 including a substrate 2 and a concavo-convex structure 3 placed on at least one surface of the substrate 2, in which the concavo-convex structure 3 is provided by repeatedly arranging a plurality of units each defined as a concavo-convex unit shape 4 including a linear convex portion 5, in one direction at substantially constant intervals on the surface of the substrate 2.