Measuring sound reduction: Before and after treatment in your study (metrics)
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Frequently Asked Questions

Common metrics include Noise Reduction Coefficient (NRC), Sound Transmission Class (STC), and Impact Insulation Class (IIC). NRC measures sound absorption, STC measures airborne sound isolation, and IIC measures impact sound isolation.
NRC indicates how well a material absorbs sound energy. A higher NRC value (ranging from 0 to 1) means better sound absorption. Before and after treatment, NRC values can be compared to quantify the improvement in sound absorption within the living space.
STC measures how well a barrier, like a wall or door, reduces airborne sound transmission. Higher STC ratings indicate better sound isolation between spaces. This is crucial for minimizing noise transfer between rooms in a Singaporean home.
IIC measures how well a floor assembly reduces impact noise transmission to the room below. Higher IIC ratings indicate better impact sound isolation. This is particularly important in multi-story homes in Singapore to minimize disturbance from footsteps or dropped objects.
While there are sound level meters available for DIY measurements, accurate and reliable before-and-after assessments typically require professional acoustic testing. Professionals use calibrated equipment and standardized methods to determine NRC, STC, and IIC values, ensuring precise results.