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BNBC 2020 · Part 8 — Building Services

Appendix G — Checklist for Acoustical Planning, Design and Post-occupancy Assessments

Gazette pages 4967–4969 · Official gazette pages (PDF, 188 KB) — use for exact tables and figures.

Form G: Checklist - Acoustical Planning, Design and Post-occupancy Assessments

Instructions:

a) A separate form should be filled in for each space/room/building

b) Fill in with text or put tick mark, as applicable

c) After filling in and signing Expected Result in Planning Design Phase, submit the form to the project owner/ client

d) A photocopy of the submitted Form (as mentioned above) shall be filled in and signed for Post- occupancy Findings

1. Name of the space/room/building for Acoustical Planning and Design: ….....................

2. Project name : ……………………………...………………………...…………….……

3. Location : .......…………………………………………………………………………...

4. Owner/Client : ..........……………………………………………………………………

5. Lead Consultant : ……………………………………………………………………….

6. Acoustical Consultant : …………………………………....……………………………

7. Type of acoustics involved in the space: Speech Music Multipurpose

8. Noise Survey on Site and Surroundings: Conducted Not Conducted

9. Noise Map: Prepared Not prepared

10. Design Parameters of the Space/Room/ Building: Sl. No. Design Parameters Expected Results Post-occupancy Findings in Planning and Design Phase

a)      Method Adopted:                 Assumptions                      Instrumental Survey

Only Manual Calculations Opinion Survey

Computational Analysis, Both of above Simulation and Prediction

b)      Ambient/Background
        level:  i) L10
                                   i) ............... dBA           i) ............... dBA
                 ii) Leq           ii) ............... dBA          ii) ............... dBA

c) Reverberation Time: i) At 1 kHz

ii) Average of all
                       i) ............... s             i) ............... s
applicable
frequencies            ii) ............... s            ii) ............... s

Sl. No. Design Parameters Expected Results Post-occupancy Findings in Planning and Design Phase

d)      Sound level in audience
        area (Average)                  ................ dBA                              ................ dBA
e)      Diffusion in audience
        area - Difference
        between max. and min.
        sound level:                    ................ dBA                              ................ dBA
f)      Signal-to-Noise Ratio
        (SNR)                           ................ dBA                              ................ dBA
g)      Intelligibility:
        i) PSA                       i) .............. %                               i) .............. %
ii) AI                       ii) ............... %                             ii) .............. %
iii) STI                     iii) .............. %                             iii) .............. %
h)      Reverberance:                     Live                                              Live

Based on average Average Average absorption coefficient Dead Dead  : <0.2 = Live, 0.2 - 0.4 = Average, >0.4 = Dead

i)      Speech Privacy
        Rating:                          ....................                              .....................
J)      Overall quality                   Excellent                       Good              Excellent                     Good
        (perceptual
                                          Average                         Poor              Average                      Poor
        evaluation):

Signature of the Acoustical ............................................... ............................................... Consultant: Date: ..................................... Date: .....................................

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.