The two most common methods of increasing a wall or ceiling partition's ability to block sound is with the use of resilient channel, or resilient sound isolation clips.
The purpose of these products is to decouple the drywall from the structural members, (studs and joists), thus interrupting the sound path to the adjoining space. While both products have been designed for the same application, they are far from equal in performance.
Resilient Channel, (also known as RC Channel), is essentially a furring channel with only one leg. By installing with the flange side down, the weight of the drywall pulls the top of the channel away from the stud, theoretically decoupling the partition.
The biggest advantage of using resilient channel over resilient sound isolation clips is cost. However, because of the high rate of failure due to installation issues, resilient channel is commonly "short circuited" making it ineffective in decoupling a wall or ceiling.
An acoustic "short circuit" is created when either the drywall comes in contact with a stud, joist, or floor, or it is screwed directly into a stud or joist. Even one screw will cause the partition to fail acoustically.
THE TWO MOST COMMON ISSUES THAT CAUSE RESILIENT CHANNEL TO FAIL
Resilient Channel is installed upside down, (flange up) causing drywall to pull the channel down and bringing it in physical contact with the stud or floor acoustically short circuiting the partition.
Standard 1-5/8" drywall screws are used instead of 1" which allows for the possibility of one or more screws to be driven through the resilient channel and into a stud acoustically short circuiting the partition.
Resilient Sound Isolation Clips will far outperform resilient channel, particularly in attenuating vibration and impact noise.
Regupol Acoustics SONUSClip™ Sound Isolation Clips are fabricated with a resilient rubber isolator attached to a metal clip which receives a standard 25 gauge furring strip. The clips are screwed directly into the studs, the furring channel snaps in place, then the drywall is screwed into the furring channel. This prevents the possibility of the furring channel touching the studs or joists, as well as making it impossible to screw through the channel into a stud.
Regupol Acoustics SONUSClip™ Resilient Sound Isolation Clips are acoustically tested, and will add 15 to 20 STC and IIC points to an existing assembly, reducing noise transference by 75% to 100%.