BNBC 2020 · Part 8 — Building Services
Appendix D — NC, NCB and Recommended Criteria for Sound Insulation
Gazette pages 4961–4962 · Official gazette pages (PDF, 647 KB) — use for exact tables and figures.
Figure 8.D.1 Noise Criteria (NC) and Balanced Noise Criteria (NCB) Curve (Source: L. L. Beranek, 1957, 1988)
Figure 8.D.2 Recommended Criteria for Sound Insulation between Dwelling Units (Source: Cavanaugh, W. J., Wilkes, J. A. 1999. Architectural Acoustics Principals and Practice, John Wiley & Sons, Inc, New York)
Source: Bangladesh National Building Code 2020, S.R.O. No. 55-Law/2020, Bangladesh Gazette (Extraordinary), 11 February 2021. Tables, figures and equations: refer to the linked gazette pages.