Resilient channel is a thin metal channel that is intelligently designed to substantially improve the sound insulation of walls and ceilings. The channel effectively isolates drywall from the framing studwork, which results in the weakening of sound waves substantially.
The resilient channels, which act as shock absorbers, typically add 3 to 5 (or more) Sound Transmission Class (STC) points to your existing wall or ceiling. You may need to be careful while selecting acoustically effective resilient channels other than hat channels, Z-channels and other lightweight metal furring systems. Even though these systems resemble resilient channels, they provide no acoustical benefits and are too rigid.
The other benefit to resilient channel specifically when installed on a ceiling is it will absorb deflection and expansion or contraction of the home so to avoid unsightly cracking. It will also act to smooth a ceiling out if some ceiling joists aren’t perfectly in line with the next.
Resilient channel can be implemented to optimal effect as long as a tested, high-performance channel is selected, and the product installed correctly.