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WHERE NEED A MLV

Simple assemblies where without other acoustical control materals and  have resonance problem

HOW MLV

Additional Information

 

SIMPLE ASSEMBLIES

Simple assemblies include assemblies that have: limited mass (single layer drywall on each side of the wall), no other sound control products (damping compounds, resilient clips), and areas where other products can't be installed (around duct work and pipes, over doors and windows, or sewn into curtains).


 

RESONANCE ISSUES

Installing the same material over and over again, like 3 layers  drywall back to back, will improve low frequency isolation because of the all the mass. But the resonance issues of  drywall are made worse when multiple layers of the same material are included in the same assembly. This is true for any rigid building material, whether drywall or wood, in any thickness.


 MLV is an acoustically dead material, meaning that it does not resonate like common building materials. All rigid building materials have resonance issues. A single layer of drywall will provide a similar STC rating to 3.00mm MLV, but that single layer of drywall will perform inconsistently (resonance issues) at various frequencies. Meaning it might test well for an STC rating, but not perform well in the real world. Combining MLV in a simple wall or ceiling assembly will provide significant gains. A wall with a layer of drywall on each side will have an STC rating of 35. Option 1, include 3.00mmMLV on one side and the STC goes up to 44. Option 2, add just a second layer of drywall on one of those sides and the STC rating only bumps to 37. What this means for you is that the MLV can double the performance of a common wall while a second layer of drywall will only slightly improve the wall. Possibly not even enough for most people to notice. 




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