Abstract: The present invention relates to fiber cement products comprising a first layer, which first layer is covered by at least one second layer, characterized in that said first layer is the top layer and the first layer material has a density of between about 0.4 and about 0.9 g/cm3 inclusive, and at least comprises cement and between 1 wt % and 70 wt % (relative to the total dry weight of said first layer material) of a lightweight filler, and said at least one second layer is the bottom layer and covers only one of the main surfaces of the first layer, thereby forming a bi-layered fiber cement product, wherein the second layer material has a density of between about 0.9 and about 1.4 g/cm3 inclusive, and at least comprises fibers and cement.

Abstract: A gypsum board according to the invention comprises • calcium sulphate dihydrate; • Tartaric acid in an amount in the range of 0.01 to 0.1% w based on the weight of calcium sulphate hemihydrate; • A fluidizer in an amount of 1.0 to 10.0 kg/m3; • Starch in an amount of 3.0 to 12.0 kg/m3.

Abstract: A seismic protective structure (100) for protecting a board partition (190). The protective structure (100) comprises a first stud (110), a second stud (120), and a wedge (140). The first stud (110) is mounted against a neighboring wall (150) and the second stud is being positioned spaced from the first stud so that a protective board (130) is mounted on the first stud and the second stud. The structure also comprises a wedge (140) mounted and positioned against the second stud (120) such that the protective board (130) mounted on the first (110) and second stud (120) is pushed at least partly out of the plane of the board partition (190) by the wedge (140) when a given level of seismic stress is appearing.

Abstract: A seismic protective structure (100) for forming part of a board partition (190) and for limiting damage to the board partition (190) when a given level of seismic stress is appearing is described. The seismic protective structure (100) comprises at least one board (101) and support elements (102, 103) for positioning the board adjacent a neighboring wall and linking the board to the remainder of the board partition wall. The seismic protective structure (100) is adapted for, when a given level of seismic stress is appearing, intentionally causing damage of the at least one board (101) thereby releasing pressure from the remainder of the board partition (190).

Abstract: Seismic damage reducing system for partitions. A seismic protective structure (100) for forming part of a board partition (190) and for limiting damage to the board partition (190) when a given level of seismic stress is appearing, is described. The seismic protective structure (100) comprising a breaking mechanism (107) introduced near an upper corner and/or lower corner of board partition (190), wherein the breaking mechanism (107) is adapted for, when a given level of seismic stress is appearing, intentionally causing damage of the board partition (190) thereby releasing stress from the remainder of the board partition (190).