01-30-06 Special Called City Council Retreat Meeting of La Porte City Council

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e 2 x 4 studs on a six inch stud plate 46 STC • . Six inch airspace added to any assembly 8 STC Some examples of resilient materials that can be used to break the tracking of sound are listed below: Resilient Clips - Spring metal clips that are mounted between layers of gypsum board, creating an additional STC gain of approximately 10 STC. Ceiling Isolators - Spring hangers that can be used to hang a ceiling and isolate any vibration. Foam Spacers -.These can be mounted between the drywall and the studs. Barium -Loaded Vinyl - A heavy-duty rubber sheet that has both mass and resiliency sandwiched between multiple layers of drywall in a wall or ceiling assembly; it will markedly increase the STC. Dissimilar Materials - Instead of using two layers of drywall with the same reverberation frequency in a wall assembly, use a layer of plywood and a layer of drywall. They have different natural harmonic oscillations, cutting down on the transmittance of sound. • Dissipation Probably one of the most effective ways to control sound is one of the simplest - create space around the sound source. In a non -reverberant situation, such as the outdoors where sound does not typically bounce off of anything, sound dissipates quickly. In fact, once you are more than approximately four feet from the sound source, the sound level declines by six decibels with each doubling of distance from the source. Masking This brings us to one of the most overlooked ways to control sound: masking the noise. You can mask the noise that leaks through a wall assembly by covering it up with another more pleasant sound. Specifically, if you have noise from barking dogs, penetrating to the client areas of your shelter, you can overlay it with Muzak and make the barking less noticeable. Because sound adds logarithmically and not arithmetically, the combined sound level of the barking dogs and the Muzak is not twice as loud as the barking. The Muzak effectively covers the barking without significantly increasing the sound level. Summary A successful shelter creates a pleasant environment for the animals, the public, and the staff. Controlling noise and odor plays a significant role in the design of an adoption - friendly facility. Although there are costs associated with adding capacity to mechanical systems and installing sound -deadening materials, much can be done during the initial planning stages to increase the practical performance of your shelter. • ;l