HDB Soundproofing: Measuring Decibel Reduction After Installation (metrics)

Common metrics include Noise Reduction Coefficient (NRC), Sound Transmission Class (STC), and Impact Insulation Class (IIC). These ratings indicate how effectively materials reduce airborne and impact noise.

A higher STC or NRC rating indicates better sound insulation. For example, a material with an STC of 50 will block more sound than one with an STC of 30. Compare pre- and post-installation measurements to quantify the improvement.

Aim for at least a 10-decibel reduction to notice a significant improvement. Achieving an STC rating of 50 or higher is generally considered good for residential soundproofing, providing a noticeable reduction in external noise.