Running the ceiling grid continuously over the tops of interior partitions is sometimes utilized so that future reconfiguration of the walls does not require replacement of the ceiling grid. In other cases, pre-manufactured demountable walls typically stop at the underside of the suspended ceiling. When the ceiling grid passes over the walls, install the double layer plenum barrier as shown in the detail below.
1 Madaras, G. and Heuer, A. (2016). “Optimizing Ceiling Systems and Lightweight Plenum Barriers to Achieve Ceiling Attenuation Class (CAC) Ratings of 40, 45 and 50”. Proceedings of the New England NoiseCon-16: Revolution in Noise Control conference, Providence, RI, 13-14 June, 2016. Electronic publication by the Institute for Noise Control Engineering.
2 The ‘sealed install’ method for the gypsum board plenum barriers is similar to fire-rated wall construction in that it includes cutting the gypsum board to within 1/4” of elements penetrating the plenum barriers. The gaps around penetrating elements, as well as small holes, joints, screw heads, perimeter edges, etc., are all taped or caulked/sealed.
3 The referenced laboratory test(s) are part of an extensive, multi-year testing program conducted by the National Research Council Canada (NRCC) and published by the Institute for Research in Construction (IRC). For more details, including 1/3 octave band transmission loss data, refer to internal reports IRC-IR-693, October 1995 and IRC-IR-761, March 1998. The research program was partially funded by ROXUL, Inc. ROCKFON and ROXUL are subsidiaries of the ROCKWOOL Group.
Our ceiling panels are especially designed to provide acoustic ceiling solutions that are beautiful while creating healthy, comfortable spaces.
Our Chicago Metallic acoustical grid systems offer a wide range of high performance suspenion system solutions. Reliable and easy to install, they pair well with our complete assortment of ceiling panels.
Rockfon metal ceiling tiles, go beyond standard 2x2 aluminum panels, with a broad range of baffles, curved, linear, open cell, perimeter, plank, and security products suitable for decorative interiors, exterior soffits and high security applications.
Acoustic absorption is part of optimizing acoustics in interiors using acoustic ceiling tiles with high NRC ratings to reduce reverberation time, noise and sound pressure level and to improve speech intelligibility, comfort and privacy.
Sound insulation of ceilings is measured using Ceiling Attenuation Class (CAC). Ceilings should be used for sound absorption and not for blocking sound between rooms. High-insulating wall products, as measured by Sound Transmission Class (STC), should be used to for blocking noise at an STC 45 or higher.
Background white noise, such as the ambient sounds generated by HVAC systems, computers and outside traffic, should be considered as part of the building design. Sound masking systems may be needed to comply with acoustic standards’ noise level requirements.