Abstract: A laminated acoustic building panel comprises a pair of plasterboard substrates which are bonded together by an adhesive layer, the panel having a dynamic Young's modulus of 0.1 to 5 GPa and a damping loss factor of 5-30% (?=0.05-0.3), and the ratio of the adhesive to the applied surface area of the substrates being 80-250 g/m2. The laminated panel is relatively soft in construction and hence sound waves caused by knocking or impact noise is surprisingly damped using considerably less adhesive than known panels. The use of soft substrates and less adhesive significantly reduces the weight of the panel. Furthermore, the use of less adhesive significantly reduces costs and makes production easier.

Abstract: A laminated acoustic building panel comprises a pair of plasterboard substrates (10,13) which are bonded together by an adhesive layer (16), the panel having a dynamic Young's modulus of 0.1 to 5 GPa and a damping loss factor of 5-30% (?=0.05-0.3), and the ratio of the adhesive (16) to the applied surface area of the substrates (10,13) being 80-250 g/m2. The laminated panel is relatively soft in construction and hence sound waves caused by knocking or impact noise is surprisingly damped using considerably less adhesive (16) than known panels. The use of soft substrates (10,13) and less adhesive (16) significantly reduces the weight of the panel. Furthermore, the use of less adhesive (16) significantly reduces costs and makes production easier.

Abstract: A suspender bottom bracket for ceiling frameworks, includes a support wall that is adapted to be fastened to a rod of the suspender and is extended by two flanges in parallel planes that each have a rim parallel to the support wall, the two rims being directed toward the interior of the volume encompassed by the support wall and the planes of the flanges. The rims have at their end a fixing lug, the fixing lugs being on the opposite side of the support wall relative to the rims, perpendicular to the support wall, and are offset in a direction parallel to the planes of the flanges by a distance sufficient to provide a passage for the framework. The flanges that extend from the support wall as far as the rims have the overall shape of parallelograms.

Abstract: A suspender bottom bracket for ceiling frameworks, which bottom bracket (10) comprises a support wall (11) which is adapted to be fastened to a rod (31) of the suspender and is extended by two flanges (12, 13) in parallel planes and each having a rim (14, 15) parallel to the support wall (11), the two rims (14, 15) being directed toward the interior of the volume encompassed by the support wall (11) and the planes of the flanges (12, 13): the rims (14, 15) have at their end a fixing lug (16, 17), said fixing lugs (16, 17) being on the opposite side of the support wall (11) relative to the rims (14, 15), perpendicularly to the support wall (11), and being offset in a direction parallel to the planes of the flanges (12, 13) by a distance sufficient to provide a passage for the framework, said flanges (12, 13) that extend from the support wall (11) as far as said rims (14, 15) having the overall shape of parallelograms (22, 23).