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Podcast: The SOUND Project
Episode: IIC (Impact Noise) Explained - The SOUND Project Episode 133
Description: Gavin defines Impact Insulation Class (IIC) and shows how it relates to sound isolation for footsteps, furniture movement, and other floor-borne vibration. He contrasts IIC with STC (airborne noise), walks through the rating scale and typical code minimums, outlines recommended IIC targets for different building types, demonstrates how IIC is tested with a tapping machine (ASTM method; result rated per ASTM E989), and details practical ways to improve IIC, like carpet + pad, floor underlayment, floating floors, and when ceiling upgrades help. He also notes slab thickness effects and why avoiding stacked noise-sensitive rooms matters....