Everytime the two layers are excited by a sound, the wave will be absorbed by the glue and converted into heat. ![]() To be effective, It needs to be applied between two stiff layers (like 2 OSB boards for example). The Green glue damping compound does a good job. To address low frequency sounds like bass music sounds, I would recommend adding a damping compound. Good sound blocking materials are OSB (Oriented Strand Board), MDF (Medium-Density fiberboard), cement board, or Mass Loaded Vynil (MLV). Those are the two main characteristics that will make your floor block airborne noises. For Airborne Noise: Use solid underlayment For example, rubber, foam, fibers, and cork are resilient materials. But they introduce a decoupling effect which will help dissipate the sound energy propagating through your home structure. Resilient materials are not very dense, nor thick. The material will absorb and reduce soundwaves at mid and high frequency. Most floor underlays are resilient materials, making them the most effective against impact sounds. What type of flooring over your underlay?įor Impact Noise: Use resilient underlayment.To block airborne noise or to deaden impact noise?.To consider the right soundproof floor underlay for you, it is important to define the followings: Generally an expected Delta IIC is 21 for a resilient material like foam, fiber or cork. This is flattering for an underlayment’s advertisement but not explicit of its sound insulation performance. ![]() A “strong” floor assembly means a better STC and IIC rating. Those lab tests generally use floor assemblies that are “under steroid”. The delta IIC doesn’t depend on the floor assembly used during the manufacturer’s lab tests. This test gives away the acoustic performance of the underlayment alone. The difference of IIC between 1) and 2) is the Delta IIC.
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