Let’s try to keep it quiet!

April 20, 2009

Decoupling (2)

Filed under: — admin @ 3:17 pm

If you have read our previous article on decoupling than you are rightfully waiting for a continuation of that article. In this article we will discuss a few different variations of the decoupling theme with one extremely common mistake called the triple leaf effect, you will hopefully gain a lot of understanding in this aspect of sound isolation.

The most common decoupling method which has been an industry standard for the past twenty to thirty years has been the use of resilient sound channels which basically consists of a strip of metalĀ  with one wall and one leg similar to a straight letter Z the one leg is then screwed into the studs while lying perpendicular to the Studs. The drywall is then hung onto the flat side of the metal. The idea here is to have the drywall sort of swaying on the channel by virtue of the channel not being screwed in on the second side. The idea would be Okay if not for the fact that the wall of the channel is very narrow and the drywallers screws are very long. In addition the drywallers are in a rush and trying to get the job done as soon as possible. The results which anyone going to a job site can see is that many screws go through the drywall, through the channel and directly into the studs thereby tremendously impeding the effectiveness of the resilience which is the very name of the channel. In fact in a recent study 16 shorts (which is the term used to describe a screw going directly through the channel and into the stud) were found in every 4 x 8 sheet of drywall.

This resulted in the invention of the Resilient Sound Clip with the idea being that a full heavier channel can be used with two legs and be far away enough from the wall that no screw can reach the stud. The way this would work would be by allowing the resilience to be done through a clip that would house the channel instead of through the channel itself.

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