A rectangular acoustical panel comprising a drywall sheet of a thickness of at least ½ inch or metric industry equivalent having a gypsum-based core and paper front and rear face layers, the drywall sheet being perforated through its faces and core with holes at least ⅛ inch in diameter and of sufficient number to comprise at least 9% of a face area of the panel, the front face being covered by a porous non-woven glass fiber veil having a translucence rendering it incapable of fully concealing the holes, the veil being covered with a non-bridging coating, the combined veil and coating being effective to conceal the holes while affording sufficient porosity therethrough to allow the panel to exhibit an NRC of at least 0.55, short edges of the panel for forming butt joints with identical panels being machined to enable the front face at the short edges to be locally recessed when the panel area adjacent the short edge is drawn against a panel support at a rear face of the panel.Ĥ. An acoustical panel as set forth in claim 1, wherein the locally recessed areas are a result of the gypsum core being permanently compressed.ģ. A rectangular acoustical panel comprising a drywall sheet of a thickness of at least ½ inch or metric industry equivalent having a gypsum-based core and paper front and rear face layers, the drywall sheet being perforated through its faces and core with holes at least ⅛ inch in diameter and of sufficient number to comprise at least 9% of a face area of the panel, the front face being covered by a porous non-woven glass fiber veil having a translucence rendering it incapable of fully concealing the holes, the veil being covered with a non-bridging coating, the combined veil and coating being effective to conceal the holes while affording sufficient porosity therethrough to allow the panel to exhibit an NRC of at least 0.55, short edges of the panel for forming butt joints with identical panels having locally recessed areas at a front face of the panel for reception of joint tape and joint compound below a plane of a major part of the front face of the panel.Ģ. Unitary structural panel for ceiling and wall installationsġ. Method of making fabric covered ceiling board Ready-mixed, setting-type cementitious composition having separately packaged acceleratorĪirborne-sound-absorbing wall or ceiling paneling Gypsum/cellulosic fiber acoustical tile compositionĬoated fibrous mat faced gypsum board resistant to water and humidityĬlay-free, asbestos-free and glass microbubble-free drying type joint compoundsįabric covered rigid structure and process of manufacture Plain surface acoustical product and coating thereforĬlay-free ready-mixed setting-type joint compound
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