What is ambient sound control code#

Some typical values are given in the following table. The impact insulation class (IIC) is used to rate the impact noise insulation of floors. Examples are heavy footsteps (particularly on bare timber or tile floors), banging doors, scraping furniture, vibrations from loud music, and plumbing noises.

Energy passes through the structure and creates noise in nearby rooms.

Impact noise (also called structure-borne noise) is produced when part of the building fabric is directly or indirectly affected.

An increase of 10 Rw units approximately halves the sound transmitted. An increase of one Rw unit approximately equals a reduction of 1 decibel (dB) in noise level. Rw rating has replaced the previously used sound transmission class (STC), but the 2 rating systems are similar.

What is ambient sound control code#

Weighted sound reduction index (Rw) is the metric used by the National Construction Code (NCC) to rate the effectiveness of a structure as an airborne noise insulator. Airborne noise is sound that travels through the air from common sound sources such as voices, TVs and radios.

There are 2 types of noise to consider for your home: The ear has a large dynamic range with the ratio of the quietest to the most dangerous sound level (able to cause permanent damage to the ear) being in the order of 1:1 trillion. Noise is measured by sound pressure level, which is expressed as a power ratio and calibrated in decibels (dB).