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The classification of soundproofing with the measure DnT,w with use of the weighted apparent sound reduction index R'w Buildings must ensure sound insulation appropriate to their use. This sound insulation is regulated by building regulations. In Germany, this is regulated by DIN 4109 Part 1 with a specification of a "minimum sound insulation". Additional requirements are referred to as "increased sound insulation". However, increased sound insulation does not necessarily lead to increased soundproofing. Soundproofing and sound insulation are not equivalent terms in this respect. This article shows that a direct assignment of the quantities R'w and DnT,w is only possible for certain geometric ratios of room volume and separating area (V/S). If a permissible deviation between R'w and DnT,w is accepted, a classification of the sound insulation values (R'w) with fixed class limits can be made. This makes it possible to classify the sound insulation with reference to the descriptive parameter DnT,w using the weighted apparent sound reduction index R'w. [ABSTRACT FROM AUTHOR]

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Impact of the equivalent sound absorption area on the sound insulation The sound insulation, expressed with the characteristic measure R'w, is used in Germany to describe the sound insulation. The metrological determination is carried out according to DIN EN ISO 16283 Part 1, whereby the separating surface is standardised with the equivalent sound absorption area. The equivalent sound absorption area is determined by measuring the reverberation time in the receiving room. DIN EN ISO 16283‐1 requires the use of Sabine's reverberation formula to calculate the equivalent sound absorption area. For rooms with larger equivalent sound absorption areas, the use of Eyring's reverberation formula has generally proven its worth. The influence of the determination of the equivalent sound absorption area by means of the reverberation formula according to Eyring is shown by theoretical consideration as well as by measurement results. It has been shown that the application of Eyring's reverberation formula results in a higher sound insulation value by up to 1 dB. [ABSTRACT FROM AUTHOR]

The central sound insulation standard for building in Germany, DIN 4109, was issued in a revised version in July 2016. The calculation procedures described in the standard can now be used to verify constructional sound insulation for masonry buildings with insulated external walls. For other building materials and construction methods, the minimum requirements can be verified, or if required the enhanced requirements. Measurements in completed buildings confirm the results and show that provided the construction materials are suitable and the specialist design is correct, good sound protection is regularly achieved. [ABSTRACT FROM AUTHOR]

In 2013, a new draft of a complete standard for DIN 4109 "Soundproofing in buildings" was issued in 4 parts - "Requirements", "Method of calculation", "Parts catalogue" and "Testing acoustics in buildings". It includes several increases in the requirements for protection against airborne noise and impact sound by comparison to DIN 4109:1989. The increases are based on the grades from monitored buildings of standard construction periodically noted in recent years. Significant changes are also included in Part 2 "Input data for verifying the requirements by calculation". A detailed computation of all transmission paths is carried out here, taking into account the special vibration reducing indices. For a brick wall, the specific indices for the weighted sound reduction index R'w,R are shown that arise for various formations of the joints. When compared with the calculated values according to DIN 4109:1989 there are differences of up to 10 dB. [ABSTRACT FROM AUTHOR]