Gypsum-panel acoustical monolithic ceiling

An acoustical panel for forming a ceiling or wall, the panel extending across a rectangular area with a nominal thickness of about at least ½ in., the panel having a core made primarily of gypsum, the core being essentially coextensive with the panel area such that it has two opposed sides each of an area substantially equal to the area of the panel, the core having a multitude of perforations extending generally between its sides, the perforations being distributed substantially uniformly across the full area of the core and being open at face and rear sides of the core, the face side of the core being covered by a porous non-woven layer that is effectively visually imperforate when painted with a non-blocking paint, the perforations being restricted at a rear side of the core by a porous acoustical non-woven fabric, the porous non-woven layer at the face side of the core being suitable for adherence by conventional drywall joint compound and a water-based non-blocking paint, the panel, when installed and the porous non-woven layer covering the face side of the core is painted with a non-blocking paint capable of concealing said joint compound, being adapted to exhibit a NRC of 0.50 or greater.

An acoustical monolithic ceiling or wall construction comprising a generally planar grid of spaced parallel support elements, a plurality of acoustical panels secured at their rear sides to the support elements in a manner such that the panels each bridge spaces between the support elements, the panels forming joints between adjacent panels, the joints overlying respective support elements, each panel having a gypsum core forming a major part of a thickness of a panel, the core having a multitude of spaced perforations distributed across substantially a full area of the core, the core perforations being open or only partially restricted at a rear side of the panel, a porous layer covering the perforations on a face side of the core, the joints between panels at their faces being concealed by tape and joint compound on the porous layer and by a continuous non-blocking coating of paint over the full faces of the panels including the tape and joint compound at their joints while an acoustically effective porosity of the porous layer is maintained whereby the construction exhibits a NRC of at least 0.50.

An acoustical monolithic ceiling or wall construction comprising a generally planar grid of spaced parallel support elements, a plurality of acoustical panels secured at their backsides to the support elements in a manner such that the panels each bridge spaces between the support elements, the panels forming joints between adjacent panels, the joints overlying respective support elements, each panel having a gypsum core forming a major part of a thickness of a panel, the core having a multitude of spaced perforations distributed across substantially a full area of the core, a porous non-woven layer covering the perforations on a face side of the core, an acoustical non-woven porous fabric laminated to a rear side of each panel to form the panel backside, the joints between adjacent panels at their faces being concealed by a continuous non-blocking coating of paint formed in situ over the full faces of the panels including their joints, the non-blocking paint leaving sufficient porosity in the porous non-woven layer at the face side of the core for the construction to achieve a NRC of at least 0.50.