When is a noise in the neighbourhood considered too loud? Which limit values an industrial company has to comply with towards neighbouring residential and mixed areas, and by which method the authorities assess this, is governed by a central nationwide regulation. This article makes the most important characteristic values and the procedure tangible.

The TA Laerm Explained Clearly for Industrial Companies

The TA Laerm is the authoritative set of rules that decides in Germany how much noise a commercial or industrial installation may cause in its surroundings. For every company that operates machines, ventilation systems or units near residential development, it is therefore far more than a formality. It determines limit values, a binding assessment procedure and the location at which measurements are taken. At sta Group we have been planning and manufacturing soundproofing solutions since 1986 with which industrial companies reliably comply with exactly these requirements. This article explains the structure, the values and the practice step by step.

What Is the TA Laerm?

The TA Laerm is the Sixth General Administrative Regulation pursuant to the Federal Immission Control Act and carries the full name Technische Anleitung zum Schutz gegen Laerm (Technical Instructions on Noise Abatement). It was issued on 26 August 1998 and supplemented in 2017 with the category of urban areas. Its purpose is the protection of the general public and the neighbourhood against harmful environmental effects caused by installation noise.

It governs exclusively the noise emanating from installations subject to approval and installations not subject to approval. Traffic noise on public roads or leisure noise do not fall under it. It therefore considers the effect of a business on the outside, not the noise inside the production.

The TA Laerm and the Federal Immission Control Act

The Federal Immission Control Act, BImSchG for short, forms the legal framework. It obliges installation operators to avoid harmful environmental effects. The TA Laerm gives concrete form to this abstract mandate with concrete figures and a comprehensible procedure.

In this way the regulation closes an important gap. Without it, it would have to be renegotiated in each individual case which noise is still reasonable. The Technical Instructions on Noise Abatement create uniform standards here throughout the country.

What Legal Character Does the TA Laerm Have?

The TA Laerm is not a law in the narrower sense, but an administrative regulation. It initially binds the authorities that decide on approvals and complaints. In practice it thereby develops a strong external effect, because courts regularly draw on it as an assessment benchmark.

For companies this means clarity. Anyone who complies with the requirements can as a rule assume that their installation is regarded as capable of approval and compatible with the neighbourhood.

For Which Installations Does the TA Laerm Apply and What Is Exempt?

The area of application is broad. It applies to installations subject to approval under the BImSchG as well as to the far larger number of installations not subject to approval. These include production halls, ventilation and refrigeration systems, loading areas, compressors and numerous other technical units.

What is decisive is not the size of the business but the question of whether relevant noise from the installation acts on a neighbourhood worthy of protection. As soon as residential development lies nearby, it becomes the decisive benchmark.

What the TA Laerm Does Not Regulate

Several types of noise are expressly exempt, because separate sets of rules apply to them. Anyone who knows the responsibilities avoids misjudgements.

Not covered by the regulation are, among others:

• Sports facilities, for which the 18th BImSchV applies
• Road and rail traffic on public routes
• Leisure noise and everyday neighbourhood noise
• Construction sites, which are subject to their own regulation
• Agricultural and socially adequate noise in certain cases

For industrial companies this means that the noise of their own installations towards the neighbourhood almost always falls under this regulation, while internal occupational safety follows a different set of rules.

Immission Limit Values of the TA Laerm at a Glance

The heart of the regulation are the TA Laerm immission limit values. They specify which rating level is permissible outside buildings depending on the area designation, separated by day and night. The more worthy of protection an area is, the stricter the limit value.

The following TA Laerm limit values apply for the day from 6 a.m. to 10 p.m. and the night from 10 p.m. to 6 a.m. Decisive for the night is the loudest full night hour.

The table shows the large gap between day and night. In a general residential area the permissible value drops at night from 55 to 40 dB(A), which comes close to a clearly perceptible reduction in the perceived loudness. For many businesses, night operation is therefore the real challenge. How commercial noise generally affects various area types is explored in more depth in our article on industrial noise in Germany.

Limit Values by Area Type and the Role of the Area Designation

The TA Laerm limit values are not absolute but depend on the designation in the development plan. A business in a commercial area must comply with 50 dB(A) at night. If its property borders a general residential area, however, the stricter value of the affected residents there counts.

This logic makes clear that it is not the location of the installation that decides, but the location worthy of protection in the surroundings. The decisive factor is always the most strongly affected neighbour.

Permissible Peak Levels and Indoor Values

Besides the continuous level, the regulation limits individual noise peaks. Short-term peaks may exceed the limit value by no more than 30 dB(A) during the day and no more than 20 dB(A) at night. A single loud event can therefore lead to an exceedance, even if the mean value is complied with.

If noise is transmitted via the building or as structure-borne sound into rooms worthy of protection, indoor values of 35 dB(A) during the day and 25 dB(A) at night additionally apply. These values are to be complied with regardless of the location of the building.

How Is the Rating Level Determined?

The TA Laerm rating level is not a raw measured value but an arithmetically corrected value. The starting point is the equivalent continuous level, that is the sound pressure level averaged over the assessment period. Surcharges are added to this averaged level which reflect the particular disturbing effect of certain noises.

It is precisely this procedure that distinguishes the regulation from a simple loudness measurement. Two installations with the same measured level can be assessed very differently if one of them produces conspicuous tones or impacts.

Averaged Level and Surcharges

Three types of surcharge are provided for. For tonal and information-bearing noises, 3 or 6 dB are added depending on the conspicuousness. For impulsive noises such as punching or metallic impacts, the surcharge results from the difference between the clocked maximum averaged level (Takt-Maximal-Mittelungspegel) and the averaged level.

A third surcharge of 6 dB applies for times of day with increased sensitivity, that is for the quiet periods in the early morning and in the evening, in residential areas additionally on Sundays and public holidays. Impulsive or tonal noise is thereby assessed noticeably more strictly than a steady hum.

Measurement and Forecasting Procedure at the Relevant Point of Immission

Measurement or forecasting is carried out at the relevant point of immission. For built-up areas this lies outside, 0.5 m in front of the centre of the opened window of the most strongly affected room worthy of protection. In this way the burden is recorded where people actually perceive it.

In the approval procedure the level is usually determined by a sound forecast, in ongoing operation by measurement. When comparing a measurement with the limit values, a measurement deduction of 3 dB(A) is taken into account. A professional determination is demanding, which is why we carry it out as part of our full-service soundproofing with up-to-date measuring equipment.

The TA Laerm in the Outer Area

A frequent special case is the TA Laerm in the outer area pursuant to Section 35 of the Federal Building Code. Exactly the question of the values for the TA Laerm outer area arises particularly often for businesses on the edge of a town, because the outer area is not expressly named in the limit value table. Administration and case law usually assign it values comparable to core, village and mixed areas, that is 60 dB(A) during the day and 45 dB(A) at night.

This approach is based on the idea that the outer area by its nature also accommodates agricultural and forestry uses and thus a certain degree of noise. A schematic application is not permissible, however, because it always depends on the specific worthiness of protection.

Formation of an Intermediate Value in Mixed-Use Situations

If differently used areas border directly on one another, for example commercial and residential, the authority forms an intermediate value. This lies between the limit values of the neighbouring areas and takes account of mutual consideration.

For businesses on the edge of a town or in the transition to the outer area, this is an important lever. Anyone who obtains a sound assessment early avoids later conflicts and expensive retrofitting.

What Does the TA Laerm Mean for Industrial Companies in Practice?

For industrial companies it is above all present in the approval procedure. Anyone who erects an installation, expands it or changes its operation must as a rule prove by a sound forecast that the immission limit values are complied with at the neighbourhood. This forecast shapes the approval notice and the conditions laid down in it.

If a limit value is exceeded, drastic consequences threaten. Possible are subsequent conditions, restrictions of the operating times up to a ban on night operation or, in extreme cases, the shutdown. Reactive solutions are then usually more expensive than forward-looking planning.

Noise Control at the Source as the Most Effective Solution

The most sustainable route leads via reduction directly at the noise source. Instead of only measuring at the point of immission, we reduce the sound where it arises. Proven solutions are machine enclosures, which completely encapsulate loud units, as well as solutions for sound insulation for industrial outdoor areas, which limit emissions at the property boundary.

As a full-service provider we accompany projects from analysis with sound measurement via design through to installation. With a state-of-the-art 3D scanner we create measurements accurate to the millimetre and manufacture custom-fit elements up to 6 metres in length in our own production. In this way the requirements of the TA Laerm can not only be complied with but secured permanently and economically.

The TA Laerm and Workplace Noise in Contrast

The TA Laerm is frequently confused with noise control at the workplace, although both pursue completely different goals. It belongs to immission control and protects the neighbourhood against the noise of an installation. The protection of a company’s own employees, by contrast, is occupational safety and follows its own rules.

Immission Control versus Occupational Safety

While the TA Laerm considers the rating level at the point of immission outside the business, occupational safety focuses on the daily noise exposure level of the employees. The relevant action values and the associated procedure are part of the broader topic of noise reduction in the industry.

In practice both levels interlock. A machine enclosure that lowers the level in the hall often also reduces the radiation to the outside and thus helps both goals at the same time.

Conclusion

The TA Laerm sets clear limit values graduated by area type and a defined procedure for determining the rating level. Anyone who knows the immission limit values, the surcharges and the relevant point of immission can realistically assess the noise control of their installation. The safest route to compliance leads via well-thought-out noise control directly at the source, planned by experts and integrated into the project at an early stage. Get in touch with us if you would like to design your installation in a legally secure and neighbourhood-compatible way.

Frequently Asked Questions about the TA Laerm

What does the TA Laerm state?

The TA Laerm specifies how much noise commercial and industrial installations may cause in their surroundings. It defines immission limit values graduated by area type for day and night as well as a procedure with which the relevant rating level is determined.

Which limit values apply at night?

At night, considerably stricter values apply than during the day. In general residential areas they are 40 dB(A), in purely residential areas 35 dB(A) and in commercial areas 50 dB(A). Decisive is the loudest full night hour between 10 p.m. and 6 a.m.

Does the TA Laerm apply to construction sites or traffic noise?

No. Construction site noise, road and rail traffic as well as sports and leisure noise are subject to their own sets of rules. It concerns exclusively the noise of installations subject to and not subject to approval under the Federal Immission Control Act.