DIN 4109-2:2026-09 - Draft

What is DIN 4109-2 about?

DIN 4109 is the central series of standards for sound insulation in buildings. Depending on the part, it covers requirements, calculation-based verification methods, or technical principles for acoustic planning and assessment of buildings.

DIN 4109-2 specifies procedures for the calculation-based verification of acoustic requirements in buildings. It supports planners, architects, and civil engineers in verifying the requirements of DIN 4109 during the planning phase and assessing the acoustic quality of buildings. The standard supplements the general sound insulation requirements with detailed calculation methods for airborne sound, impact sound, and noise from building services equipment.

What content does the standard cover?

DIN 4109-2 describes calculation and verification methods for various sound transmission paths within buildings. It takes both building components and building services equipment into account.

Topics covered at a glance:

• Calculation-based verification of structural sound insulation
• Airborne sound insulation between rooms and usage units
• Impact sound insulation of floors and stairs
• Sound transmission via flanking building components
• Sound insulation of technical building equipment
• Calculation methods for residential and non-residential buildings
• Verification methods for different types of construction and structures

Why is the standard relevant in practice?

DIN 4109-2 enables early assessment of acoustic requirements during the planning stage. As a result, requirements for structural sound insulation can be taken into account efficiently and later remedial work can be avoided.

The specifications for calculating airborne and impact sound, as well as the consideration of flanking sound transmission, are particularly relevant. The standard therefore supports standards-compliant planning of residential buildings, office buildings, and other structures with increased requirements for building acoustics.

What changes are there compared with the previous edition?

As this is a draft, the focus is on the planned adjustments and updates. The aim is to further develop the calculation-based verification methods and align them with current technical and normative requirements in the field of structural sound insulation. The specific changes compared with the previous edition should be reviewed separately after publication of the final version of the standard.

Target audience

DIN 4109-2 is aimed in particular at:

• Architects
• Civil engineers
• Specialist planners for building physics
• Sound insulation experts
• Inspection engineers
• Housing construction companies
• Planning and engineering offices

Supplementary standards in the DIN 4109 series

For holistic planning of structural sound insulation, further parts of the DIN 4109 series may be relevant depending on the application. These include requirements for sound insulation, calculation-based verification methods, and provisions for technical installations and different construction methods.