Sound insulation in buildings - Part 34: Data for verification of sound insulation (component catalogue) - Additional layers fixed to solid structural elements
1Key Takeaways
This standard addresses the weighted improvement in sound insulation w and the weighted impact sound reduction w of facing constructions in front of solid building components. For the purposes of this standard, facing constructions are structures in which cladding, insulation, or a substructure is installed in front of…
2Expert Interpretation
This in-depth interpretation of Part 34 of the DIN 4109-34:2016-07 building sound insulation standard covers the calculation method for the acoustic performance of additional layers, resonant frequency calculation, sound insulation improvement data tables, and application cases, providing professional guidance for building acoustic design and verification.
DIN 4109-34 Standard Overview and Technical Background
DIN 4109-34:2016-07, a key component of the German building sound insulation standard system, specifically specifies the calculation method for the acoustic performance of additional layer structures on solid building components. This standard replaces several older versions, including DIN 4109 Beiblatt 1:1989-11, achieving full alignment with European building sound insulation standards and technical updates.
The core value of this standard lies in providing a systematic calculation method and data support, enabling engineers to accurately predict the improvement in the sound insulation performance of building components by Vorsatzkonstruktionen (additional layer structures). The standard covers additional layer types including wall layers, ceiling systems, floating floors, and system floors.
Key technical parameters and calculation methods
The key technical parameters defined in the standard include resonance frequency f0, dynamic stiffness s' and surface density m', which directly affect the sound insulation performance of the additional layer.
Resonance frequency calculation model
For the additional layer structure directly fixed to the base component through the insulation layer, the resonance frequency calculation formula is:
f0 = 160 × √(s'/(m1' × m2')) (Hz)
Where:
s' - dynamic stiffness of the insulation layer (MN/m³)
m1' - surface density of the base component (kg/m²)
m2' - surface density of the additional layer (kg/m²)
Sound insulation improvement data table
| Resonance frequency f0 (Hz) | Sound insulation improvement ΔRw (dB) | Applicable conditions |
|---|---|---|
| ≤74.4 | 20 | Lowest resonant frequency |
| 200 | 1 | Low frequency band |
| 315 | 5 | Mid-frequency band |
| 630-1600 | 10 | Best effect in high frequency band |
| >1000 | 5 | Ultra-high frequency band |
Special requirements for different types of additional layers
4.2 Wall Additions
Wall additions include freestanding additions, coupled additions, and additions fully secured by insulation. Design requirements ensure that at least 70% of the cavity is filled with porous insulation, with a flow resistance within the range of 5-50 kPa·s/m².
4.4 Ceiling Systems
Closed ceilings (e.g., plasterboard ceilings) can be calculated using standard methods, but data for cellular ceilings is currently unavailable. Particular attention should be paid to the lateral sound transmission effects of ceilings acting as lightweight partitions.
4.5 Floating Floors
Floating floors not only improve impact sound insulation but also enhance airborne sound insulation. The standard provides a detailed calculation formula for the impact sound improvement ΔLw: ΔLw = 13lg(m') - 14.2lg(s') + 20.8 (dB) Applicable scope: dynamic stiffness 6-50 MN/m³, surface density 60-160 kg/m² Implementation recommendations and engineering applications Design considerations 1. Resonance frequency control: Improper structural parameter design may lead to harmful sound insulation depressions. Special attention should be paid to the low-frequency noise spectrum. 2. Lateral sound transmission control: The continuity of the additional layer at the separation component directly affects the selection of the lateral sound transmission calculation method. 3. Material compatibility: The dynamic stiffness and surface density of different materials must be precisely matched to achieve the best sound insulation effect.
Construction quality control
1. Avoid any form of sound bridges (connections to the original structure, side walls, pipes, door frames, etc.)
2. Ensure the integrity and continuity of the edge sound insulation strips
3. For high loads (>3 kN/m²), the compressibility of the insulation layer must not exceed 3 mm
Standard Evolution and Technological Development
DIN 4109-34:2016-07 represents an important advancement in building acoustic standards, mainly reflected in:
| Technical Characteristics | Old Version | Improvements in the New Version |
|---|---|---|
| Data Source | German Research Data | Based on EN 12354 series of European standards |
| Calculation methods | Mainly based on empirical formulas | Combination of theoretical models and experimental data |
| Scope of application | Limited construction types | Covering all types of modern building structures |
| Accuracy requirements | Relatively relaxed | Strict error control and verification requirements |
Continuous updates to the standards reflect technological advances in architectural acoustics, particularly the latest achievements in materials science and computational acoustics. Future versions are expected to further refine the acoustic performance data for thermal insulation composite systems and ventilated facades.
Engineering Case Study Analysis
Case 1: Sound Insulation Retrofit in an Office Building Conference Room
The original 240mm concrete wall (Rw=52dB) was retrofitted with an additional layer of 80mm gypsum board (m2'=60kg/m²), and the insulation layer had a dynamic stiffness of s'=15MN/m³. The calculated resonant frequency f0=98Hz, and the table showed ΔRw=18dB, resulting in a total sound insulation of 70dB after the retrofit.
Case 2: Impact Sound Insulation Improvement in a Residential Building
A 200mm concrete floor slab was retrofitted with a floating floor (m2'=120kg/m²), and the insulation layer had a s'=20MN/m³. Calculated ΔLw=23dB, significantly improving the acoustic comfort of the downstairs residents.
These cases demonstrate the effectiveness and practicality of the DIN 4109-34 standard in actual projects, providing a reliable technical basis for architectural acoustic design.
Conclusion and Outlook
DIN 4109-34:2016-07, as an important component of the building sound insulation standard system, provides a scientific and rigorous method for calculating the acoustic performance of additional layers. Through accurate parameter determination and reasonable structural design, the sound insulation performance of building components can be significantly improved.
With the increasing requirements for building energy conservation and the continuous emergence of new materials, the standard will continue to be improved and expanded in the future, especially in providing more technical guidance in composite systems, green building materials and intelligent acoustic control.
In actual application, engineers should fully consider the specific conditions and requirements of the project, combine the calculation methods and data provided by the standard, and formulate the optimal acoustic design plan to ensure that the quality of the building sound environment meets the expected goals.