NF EN 12354-3 : 2000

Foreword
1 Scope
2 Normative references
3 Relevant quantities
    3.1 Quantities to express building performance
          3.1.1 Apparent sound reduction index
                  R'45 degrees
          3.1.2 Apparent sound reduction index
                  R'tr,s
          3.1.3 Standardized level difference
                  D2m,nT
          3.1.4 Normalized level difference
                  D2m,n
          3.1.5 Relations between quantities
    3.2 Quantities to express element performance
          3.2.1 Sound reduction index R
          3.2.2 Element normalized level difference
                  Dn,e
          3.2.3 Other relevant data
    3.3 Other terms and quantities
4 Calculation models
    4.1 General principles
    4.2 Determination of direct transmission from
        mative)tic data on elements
          4.2.1 Small elements
          4.2.2 Other elements
    4.3 Determination of flanking transmission
    4.4 Interpretations
    4.5 Limitations
5 Accuracy
Annex A (normative) List of symbols
Annex B (informative) Determination of transmission
          by elements from composing parts
Annex C (informative) Influence of facade shape
Annex D (informative) Sound reduction index of elements
Annex E (informative) Estimation of indoor sound levels
Annex F (informative) Calculation examples
Bibliography

Establishes a calculation model to estimate the sound insulation or the sound pressure level difference of a facade or other external building surface. The calculation is based on the sound reduction index of the different elements from which the facade is constructed, and includes direct and flanking transmission.