Factors affecting sound insulation of doors and windows

Speaking of sound, we usually think of dB values and STC values. What's the difference between them? The dB value is mainly used to describe thevolume ofsound, while the STC value is used to evaluate the sound insulation performance of building materials or structures. STC is the measured value of a single component under laboratory conditions, indicating the noise decibel that can be blocked by the component. The detection basis is as follows: ASTM E90 Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and The Elements.

STC Testing

The sound insulation performance of windows doors refers to the ability to block and weaken the transmission of sound, generally be measured by STC. The greater the STC value, the better the sound insulation performance of the windows doors, and the more comfortable the indoor environment.

The main factors affecting the sound insulation performance of windows doors include the material and structural design of the door and window frame, the processing technology of the door and window, the air tightness of the window , the configuration and thickness of the glass, the installation method of the door and window, etc.

01

Under the same frame thickness and glass configuration condition,due to the density of different materials and their ability to absorb and block noise, the sound insulation performance difference of different frame materials are as follows:

For aluminum windows doors, the sound insulation effect of thermal broken aluminum windows doors is better than that of non-thermal broken aluminum windows doors. Because the thermal insulation strip can buffer and reduce the spread of sound, thereby improving the sound insulation effect.

In addition, the multi-cavity design of the profile structure and the addition of foam filling in the cavity can also improve the thermal insulation and sound insulation performance.

The window door processing technology affects the sound insulation effect. For example, the smaller the gap between the frames, the better the sound insulation effect.

The main factors that affect the air tightness of windows doors are as follows:

01

Locking mechanism

Stability of the locking system of frame and sash.Multiple locking points would be a good solution.

02

Quality of sealing rubber strip

Quality of the sealing rubber strip and brush strip. Poor quality strips will lead to the sealing not durable and tight enough.

03

Installation of rubber strip

Whether the sealing rubber strip is continuous,whether the paste is firm and fit. Discontinuous or non-fit sealing rubber strips will reduce the air tightness of windows doors.

04

The number of sealing layers

The number of sealing layers: under the same structure and configuration conditions, the more sealing layers, the better air tightness will be.

The sound insulation performance of windows doors under different glass configurations and thickness:

01

Insulated glass：

The inert gas filled into the hollow layer can play the role of heat insulation and sound insulation. Multi-layer hollow will improve the sound insulation effect.

02

Laminated glass

Two or more pieces of glass connected by PVB intermediate film, PVB film can reduce the noise going through the glass, sound insulation effect is good.

03

Vacuum glass

The theoretical vacuum glass has excellent sound insulation performance, but because the current vacuum glass production technology is limited, the actual sound insulation performance of the actual vacuum glass is much lower than the theoretical sound insulation performance, and the price is relatively expensive.

04

Acoustic glass

What is acoustic glass? acoustic glass is composed of laminated glass with double or multi-layer composite structure, and the interlayer between the glass is a sound insulation damping glue, which can destroy the sound wave. Therefore, acoustic glass has better sound insulation effect than the laminated glass, especially for low frequency noise at 500Hz and below.

05

Different combination of glass

Different glass thicknesses can reduce sound resonance and improve sound insulation.If you want to achieve good thermal insulation and sound insulation performance at the same time, you can use a combination of insulation glass, laminated glass and different glass thicknesses.

(The figure is for reference only)

Installation method of windows doors

The effective gap seal between the frame and the wall can block and weaken the transmission of sound, and improve the overall sound insulation effect of the house.

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