- 5/8" gypsum board (type X) – 1 layer
- Quick install3 (no tape or caulk)
- STC 41 with the ceiling (lab test #NGC0615037)
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 Kruger, K. "The Effect of Various Parameters on the Sound Isolation between Offices with Suspended Ceilings." Canadian Acoustics, 16 (2), 1988, pp. 9-23.
3 The 'quick install' method for the gypsum board plenum barriers uses rectangular cut pieces of gypsum board without cutouts for penetrating elements. Large holes in the plenum barrier around penetrating elements are stuffed with stone wool, batt and insulation. Small holes, joints, screw heads, perimeter edges, etc. are NOT taped or caulked/sealed.
4 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 ROCKWOOL are subsidiaries of the ROCKWOOL Group.