Sound insulation in buildings - Part 34: Data for verification of sound insulation (component catalogue) - Additional layers fixed to solid structural elements / Note: Applies in conjunction with DIN 4109-31 (2016-07).*To be amended by DIN 4109-34/A1 (...
1Key Takeaways
This specification addresses the improvement of airborne sound insulation rating Rw and impact sound insulation rating Lw by additional layers (pre-constructions) fixed to heavy structural components. Pre-constructions refer to a finishing material, insulation layer, or framing structure installed before the heavy stru…
2Expert Interpretation
This in-depth interpretation of DIN 4109-34:2016-07 covers the calculation methods for the acoustic performance of additional floors attached to solid structural elements in buildings. Key technical points, such as calculating the sound insulation improvement of Vorsatzkonstruktionen structures, determining resonant frequencies, and improving impact sound with floating floors, are analyzed in detail, providing a standardized calculation basis for building acoustic design.
DIN 4109-34 Standard Overview and Technical Background
DIN 4109-34:2016-07, a key component of the German building sound insulation standard system, provides standardized data specifically for calculating the acoustic performance of additional layers attached to solid structural elements. 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.
Standard Scope and Core Concepts
This standard applies to cladding structures attached to solid walls or floors via an insulating layer or substructure. These Vorsatzkonstruktionen alter the sound insulation performance of the underlying solid structure. The standard clarifies that when the additional structure is completely interrupted in the area of the separating member, the flanking sound insulation can be calculated according to DIN 4109-2; if it is partially continuous, the flanking sound level difference in DIN 4109-33 must be used.
Acoustic improvement mechanism of additional structural layers
The sound insulation performance of single-layer rigid components can be improved by additional structural layers, but the improvement effect depends on the characteristics of the system. Most additional structures are implemented using flexible shells, which are considered flexible shells when their critical frequency is greater than approximately 1600Hz. Although floating floors no longer behave as flexible shells in many cases, the discussion in this section still applies.
| Construction type | Application area | Typical form |
|---|---|---|
| Vorsatzschalen | Wall area | Independent cladding with substructure, coupled cladding, flat fixed cladding, thermal insulation composite system |
| Unterdecken | Ceiling area | Independent ceiling with substructure, suspended ceiling, directly fixed ceiling |
| Schwimmende Estriche | Floating floor, double floor, cavity floor |
Resonance frequency calculation and sound insulation improvement determination
The sound insulation improvement Rw is determined by three key parameters: the surface density m (kg/m²) of the foundation member, the weighted sound insulation Rw (dB) and critical frequency fg (Hz) of the foundation member, and the resonant frequency f0 (Hz) of the double-layer system consisting of the foundation member and the additional structure.
For the additional structure fixed directly to the foundation member through the insulation layer (without support or keel), the resonant frequency f0 is calculated according to formula (1):
f0 = 160 × √(s'/(m1 × m2)) (Hz)
where s' is the dynamic stiffness of the insulation layer (MN/m³), m1 is the surface density of the foundation member, and m2 is the surface density of the additional structure covering.
Additional structural sound insulation improvement data table
| Resonance frequency f0 (Hz) | Sound insulation improvement ΔRw (dB) |
|---|---|
| f0 ≤ 74.4 | 20 lg(0.5×f0) - 0 |
| 200 | 1 |
| 250 | 3 |
| 315 | 5 |
| 400 | 7 |
| 500 | 9 |
| 630-1000 | 10 |
| >1000 | 5 |
Calculation of Acoustic Performance of Floating Floors
4.5.1 Description of Floating Floor Construction
A floating floor is a floor laid on an insulation layer, free to move with the sub-base and completely separated from all vertical members by edge insulation strips. The thermal insulation layer consists of impact sound insulation material and may be used in combination with thermal insulation material.
4.5.4 Calculation and verification data
Improvement of airborne sound insulation: Determine according to Table 1, the resonant frequency f0 is calculated according to formula (1)
Improvement of impact sound insulation: For mortar-type floating floors, calculate according to formula (3):
ΔLw = 13 lg(m') - 14.2 lg(s') + 20.8 (dB)
Applicable for dynamic stiffness s' in the range of 6-50 MN/m³ and floor surface density m' in the range of 60-160 kg/m²
Acoustic properties of floor coverings
Table 2 provides the assessed impact sound improvement ΔLw values for soft elastic floor coverings for solid floor slabs. These values are only valid when used in combination with solid floor slabs according to DIN 4109-32.
| Flooring type | ΔLw (dB) |
|---|---|
| Linoleum composite ply (DIN EN 687) | 14 |
| PVC composite ply with jute felt base (DIN EN 650) | 13 |
PVC composite ply with cork base (DIN EN 652) 16 Needle-punched felt, thickness = 5mm 20 System Flooring (Double-layer and Cavity Flooring) 20 System Flooring (Double-layer and Cavity Flooring) 20 System Flooring is a standardized finishing system elevated above a substructure, such as double-layer and cavity flooring used in interior finishes. It provides a floor cavity beneath the load-bearing layer for flexible use and to accommodate various installation systems. Influencing parameters include: board density, inter-board sealing, sealing of gaps in walls and mountings, effectiveness of structure-borne sound insulation, cavity damping, and installation openings. Recommendations and precautions for standard implementation1. Resonance frequency control: The inherent resonant frequency of the additional structure may lead to a harmful decrease in sound insulation if the structural parameters are not properly dimensioned 2. Avoidance of sound bridges: Any type of sound bridges (with rough floor slabs, adjacent walls, pipes, door frames) must be avoided 3. Construction quality: There is a large dispersion in the improvement in impact sound of floating floors, which is mainly suspected to be due to the construction quality of the floor structure 4. System test: For special structures, it is recommended to use the manufacturer's system test values Technological evolution and standard developmentThe main changes of DIN 4109-34:2016-07 compared to the previous version include: complete reformulation to adapt to the update of European building sound insulation standards; adoption of Table 18 and the assessment of impact sound insulation values; and technical content is coordinated with the DIN EN 12354 series of standards. Some sections of the standard (such as 4.3 Thermal Insulation Composite Systems and 4.8 Front Overhang Ventilated Facades) are still under development, reflecting the continuous development nature of the standard. 3Version History
DIN 4109-5:1963
older
1963-01
DIN 4109-5:1984
older
1984-01
DIN 4109 Bb.1/A1:2001
Amd /A1/2001-01 older
2001-01
DIN 4109 Bb.1/A2:2006
Amd /A2/2006-01 older
2006-01
DIN 4109-34:2016-07
2016-07
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Referenced herein
Standards that cite DIN 4109-34:2016-07
Referenced by DIN 4109-34:2016-07
DIN 18560-1
DIN 18560-2
DIN 4108-10
DIN 4108-4
DIN 4109-1
DIN 4109-2
DIN 4109-31
DIN 4109-32
6Frequently Asked QuestionsWhat is DIN 4109-34:2016-07?
DIN 4109-34:2016-07 — Sound insulation in buildings - Part 34: Data for verification of sound insulation (component catalogue) - Additional layers fixed to solid structural elements / Note: Applies in conjunction with DIN 4109-31 (2016-07).*To be amended by DIN 4109-34/A1 (... is an international standard developed by German Institute for Standardization. This specification addresses the improvement of airborne sound insulation rating Rw and impact sound insulation rating Lw by additional layers (pre-constructions) fixed to heavy structural components. Pre-constructions refer to a finishing material,...
What does DIN 4109-34:2016-07 cover?
This standard covers: This specification addresses the improvement of airborne sound insulation rating Rw and impact sound insulation rating Lw by additional layers (pre-constructions) fixed to heavy structural components. Pre-constructions refer to a finishing material, insulation layer, or framing structure installed...
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
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The current published version is DIN 4109-34:2016-07, published on 2016-07. Always check for amendments or pending revisions.
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