Which approach is NOT effective in reducing impact sound transmission?

Choosing lightweight floor coverings is not an effective approach for reducing impact sound transmission because lighter materials tend to transmit sound more readily than heavier materials. When it comes to sound insulation, particularly for impact sound, mass plays a crucial role. Heavier materials can absorb and dampen sound more effectively, thereby reducing the transmission of impact noise from one floor to another.

On the other hand, using mass toppings on floors, installing soundproof underlayment, and applying sound-absorbing materials are proven methods to diminish impact sound transmission. Mass toppings add density and weight, which help in sound isolation. Soundproof underlayment acts as a barrier between the floor finish and the substrate, absorbing sound and reducing vibrations. Sound-absorbing materials help to minimize reverberation and echo within a space, further assisting in sound reduction. Therefore, lightweight floor coverings do not serve the purpose of effectively reducing impact sound transmission.