Disclosed herein are plaster boards that include first and second layers of hardened plaster material, a liner attached to the first layer of hardened plaster material, and a first material (e.g., a polymer material such as a viscoelastic polymer) adhered between the liner and the second layer of hardened plaster material. The liner includes one or more structurally weakened regions each extending substantially from a first edge to a second opposing edge of the plaster board. The structurally weakened regions of the liner may facilitate creation of a fissure that propagates substantially within a plane within the plaster board. Methods for making the plaster boards may involve drying wet plaster material while it is in contact with a liner having structurally weakened regions, processing a liner to form its structurally weakened regions while in contact with wet plaster material, or processing a liner to form its structurally weakened regions while in contact with hardened plaster material.

Gypsum panels and methods of making gypsum panels are provided. A method of making a gypsum panel includes combining gypsum stucco and a halide salt sequestration agent with water to form a gypsum slurry and setting the gypsum slurry to form at least a portion of a gypsum core, wherein the halide salt sequestration agent is present in an amount effective to sequester at least a portion of halide salt present in the gypsum stucco. A gypsum panel includes a gypsum core that comprises set gypsum and a halide salt sequestration agent, wherein the halide sequestration agent sequesters at least a portion of halide salt present in the gypsum core.

Gypsum panels and methods of making gypsum panels are provided. A method of making a gypsum panel includes combining gypsum stucco and a halide salt sequestration agent with water to form a gypsum slurry and setting the gypsum slurry to form at least a portion of a gypsum core, wherein the halide salt sequestration agent is present in an amount effective to sequester at least a portion of halide salt present in the gypsum stucco. A gypsum panel includes a gypsum core that comprises set gypsum and a halide salt sequestration agent, wherein the halide sequestration agent sequesters at least a portion of halide salt present in the gypsum core.

Gypsum panels and methods of making the same are provided. A gypsum panel includes a gypsum core containing set gypsum and unexpanded perlite ore, wherein the unexpanded perlite ore is present in the gypsum core in an amount greater than any other component, other than the gypsum.

Gypsum panels and methods of making the same are provided. A gypsum panel includes a gypsum core containing set gypsum and unexpanded perlite ore, wherein the unexpanded perlite ore is present in the gypsum core in an amount greater than any other component, other than the gypsum.

The invention concerns a gypsum plasterboard (10) comprising at least an upper gypsum layer (16) having a first density, first hardness and first thickness and a lower gypsum layer (17) having a second density, a second hardness and a second thickness. The first density is lower than the second density and/or the first hardness is lower than the second hardness, and the first thickness is lower than the second thickness. The plasterboard according to the invention are heavy or dense plasterboards with an enhanced fixing ability.

The invention concerns a gypsum plasterboard (10) comprising at least an upper gypsum layer (16) having a first density, first hardness and first thickness and a lower gypsum layer (17) having a second density, a second hardness and a second thickness. The first density is lower than the second density and/or the first hardness is lower than the second hardness, and the first thickness is lower than the second thickness. The plasterboard according to the invention are heavy or dense plasterboards with an enhanced fixing ability.

A method of preparing a thermoplastic roofing membrane, the method comprising (i) extruding a composition including a thermoplastic polymer and a mineral filler to form an extrudate; (ii) forming the extrudate into a sheet having first and second planar surfaces; (iii) allowing the sheet to at least partially cool; and (iv) mechanically treating the first planar surface of the sheet to thereby expose the mineral filler.

Disclosed herein are plaster boards that include first and second layers of hardened plaster material, a liner attached to the first layer of hardened plaster material, and a first material (e.g., a polymer material such as a viscoelastic polymer) adhered between the liner and the second layer of hardened plaster material. The liner includes one or more structurally weakened regions each extending substantially from a first edge to a second opposing edge of the plaster board. The structurally weakened regions of the liner may facilitate creation of a fissure that propagates substantially within a plane within the plaster board. Methods for making the plaster boards may involve drying wet plaster material while it is in contact with a liner having structurally weakened regions, processing a liner to form its structurally weakened regions while in contact with wet plaster material, or processing a liner to form its structurally weakened regions while in contact with hardened plaster material.

A method to produce a building panel, including: providing a substrate, applying a thermosetting binder in dry form on the substrate for forming a sub-layer, applying a sheet on the sub-layer, and pressing the substrate, the sub-layer and the sheet together to form a building panel, thereby the thermosetting binder of the sub-layer impregnates the sheet from below. Also, a semi-finished product.