The Noise Problem

Defining Noise Problems and Solving them

DSA Seals Are Available Australia Wide

The Noise Problem

Loud noise hurts everyone, and it’s bad for business. Continued exposure impairs hearing. Some businesses by their nature demand isolation from the intrusive sound of the outside world. From residential home theatre systems, to concert halls, night clubs, offices, schools, heavy equipment rooms, noise levels expose employers to potential liabilies with hearing damage.

Defining Noise Problems and Solving them

To define your specific problems, you need a basic understanding of how to quantify your unwanted noise and the sound level that will be acceptable. Understanding the degree of sound control you need to achieve requires a brief overview of the science of sound and its measurement. Sound is vibrations in air moving in waves. The rate of sound pulsations measured in cycles per second is called frequency, also known as hertz – Hz -. The range of human hearing is considered to be 20 to 20,000 Hz. Sound pressure levels are measured in decibels, – dB -. It has been proven that the human ear perceives changes in loudness caused with even small changes in those levels. Each 10 dB increase doubles the loudness and the annoyance or discomfort that goes with it.

*To go from definitions to practical applications, we first need to understand how sound is transmitted from its source through a barrier and how a barrier is rated for its ability to inhibit or block sound.

Sound insulation performance is defined in terms of the STC or Rw rating as shown in the Sound Transmittion Class table below. Current Australian standards have adopted international (180) terminology which refers to the weighted sound reduction index (Rw). Previously the term used was sound transmission class. With that information, we can examine the role of sealing systems in optimising the performance of doors that function as a sound barriers.

Typical Performance Ratings

A door is normally tested as an element installed in a wall. For example in an acoustic laboratory, the test aperture is generally around 3.3m square. The test is actually conducted on a filler wall 3.3m x 3.3m into which a doorway has been installed. The overall test result is a combination of the individual performances of the filler wall, the door panel and the acoustic seals at the edges of the door.

The highest level of performances is achieved when the door panel is completely sealed into the opening, with caulking on all four edges. This is commonly referred to as the panel performance. This gives an impractical result as the door is no longer able to open. It does however give a useful guide to the performance of the seal.

DSA acoustical door seals consistently achieve ratings which are comparable with those of a fully caulked door. The typical performance ratings achieved by DSA seals on different types of doors are in the adjoining table.

Sound System 52 STC-Rw

The values in the table at right show the derivation of transmission class STC – Rw.

From testing a DSA class 52 Acoustic System.

System Components:

  • DS20-24 head and jamb seal
  • S9168 head and ham seal
  • DRS1530 Automatic door bottom seal
  • DST20-24 threshold with an S6577 seal
  • The acoustic system was installed on an STC55 door fitted in a standard, 1mx21m test opening between two reverberating rooms.


Acoustic Seals Test Performance Data

Technical Service and Support

At DSA we are always happy to provide service and technical advice for acoustic, weather, fire, and smoke protection to Acoustic Engineers, Architects, and Builders. Door Seals Australia weather seals are guaranteed for two years against defects in material and workmanship provided seals are fitted in accordance with manufacturer’s specifications. Defective goods will be replaced. However, no claim for work done there on or damage incurred will be allowed.

The Noise Problem

Loud noise hurts everyone, and it’s bad for business. Continued exposure impairs hearing. Some businesses by their nature demand isolation from the intrusive sound of the outside world.

Sliding Door Systems

Made with high-quality materials and top-notch workmanship, our sliding door systems are highly suitable for residential and commercial space.

Standards Compliance

DSA seals are designed to meet the most rigorous International Standards and Building Codes.

Fitting Instructions

Using our installation system guarantee your seals will work correctly.