The answer is a little complicated. It needs your patience to read I will try to explain my knowledge

Through sound insulation, as I understand unwanted soundproof or, better word to use is NOISEPROOF. Now check following info to understand NOISE ??

In order to soundproof the apartment windows, we need to reduce the unwanted sound level (ie noise) by 100% from the outside. First, we need to understand some basics …

We can imagine sounds spreading like waves or ripples on the water.

In most cases, the problem is traffic noise, that is, low and medium frequencies.

Sound is measured on a logarithmic scale, not on an arithmetic scale.

60 * 2 is not equal to 120 in sound, because sound is measured on a logarithmic scale, not an arithmetic scale. A few more examples to clarify

For our ears, different

  • 1 dB is virtually inaudible.
  • Hardly heard 3dB.
  • 5dB is clear and audible.
  • 10 dB is equivalent to a 50% reduction in sound intensity perception.
  • 20 dB is equivalent to a 75% reduction in sound intensity perception.

This difference of 20 dB or 75% reduction is usually possible. I can say that using soundproof windows works better.


We have two ways to experience noise, one is airborne noise, and the other is structurally transmitted noise.

Through doors and windows, we can control most of the airborne noise, while the structure transmitted less noise.

I think I have talked about which part of the problem, and now try to talk about which part of the problem is possible.

There are two aspects to reducing noise through doors and windows

Specification for frame / sash materials – all doors / windows shall be sound proof Let’s define acoustic comfort or sound insulation of frames / window frames as follows

If you choose aluminum as the material for the sash / window frame, use thermal break aluminum with multi-point locking. In China, all insulated aluminum door and window systems are imported from Europe, and you can find their acoustic or sound insulation performance in their performance table as described below

The acoustic performance can be seen in the table above 35 ~ 39 dB

Pl noted that non-thermal fracture systems in aluminum are inferior to thermal fracture systems [1], and even most products of well-known brands alumil, schüco, reyners, technal, and other European brands do not perform acoustic performance or Sound insulation test. The main reason for the low product quality is the high price pressure on the project market. In most operable and sliding windows, the lock is also a single point lock, again ensuring poor sound insulation

If you choose uPVC doors and windows as the material, please follow the Class A uPVC profile in EN 12608 / or GB / T 8814 (minimum wall thickness 2.8 mm), the noise reduction is about 42dB; these figures are for frames / windows that have nothing to do with glass

If you choose wooden doors and windows as the material, choose a brand with the same acoustic performance or sound insulation performance.

It is also worth mentioning that traditional sliding doors / windows can never be soundproofed, so never use sliding to soundproof.

Glass Performance Specifications-I want to share some insights with you

  • 12 mm glass has better sound insulation than 24 mm (6 mm clear glass + 12 mm argon filled / or, air gap + 6 mm clear glass).
  • Asymmetric double-layer insulating glass, such as 23 mm (6 mm transparent glass + 12 mm argon-filled / or, air gap + 5 mm transparent glass), has better sound insulation than the symmetrical 24 mm double-layer insulating glass.
  • Acoustic PVB has better sound insulation effect than ordinary PVB laminated glass, and is only used for treble. For traffic noise or bass, both behave the same.

The glass specifications are based on sound insulation or the required acoustic comfort, as well as the allowable glass thickness of the selected uPVC / or, aluminum / or, wood system and the weight capacity of the available hardware

Bottom Line-Factors Affecting Unwanted Sound Insulation Level


  • Door and window air tightness
  • Specification for aluminum / uPVC/ wood window materials
  • Live acoustic performance also varies depending on the acoustic conditions of the environment (type of sound source, location relative to sound source, etc.)