When this is the case, consider using an EVA-based mass loaded vinyl material that does not off-gas and has better acoustical properties. When MLV is specified, it is difficult to opt out of it. Summary – When to use 2 lb Mass Loaded Vinyl: However, the hardening side-effect may deteriorate the product over time from an acoustic perspective. When it is enclosed behind drywall, there is limited safety down-side to using the product. When considering using MLV, also review the safety information, usually included on the Material Safety Data Sheet. However, over time these plasticizers tend to migrate out, resulting in off-gassing that makes the material rigid and sometimes produces a noticeable odor. Chemical additives are put in called “plasticizers” that make the material flexible. MLV, due to its base Vinyl polymer, is naturally rigid. One of the biggest complaints is off-gassing. There are also a number of substitutes for Mass Loaded Vinyl. If an STC of 50+ is needed on wood stud assemblies, or 60+ on metal studs, 2 lb mass loaded vinyl is often the most cost-effective approach. One major benefit of installing a single sheet of 2 lb MLV is that the labor cost is significantly reduced (rather than double-installing standard-weight product). The density of the material does not change, so it is the thickness of the extrusion that is actually driving the weight change. Rather then 1/4″ thick, 1 lb Mass Loaded Vinyl is 1/8″ thick. The thickness also changes in equal proportion. These weights are often “nominal” so that 2 lb MLV actually weighs approximately 1.8 lbs/square foot (and 1 lb MLV actually weights 0.9 lbs/square foot). 2 lb mass loaded vinyl is twice as heavy as 1 lb. Why not just staple up two layers of 1 lb material, if there’s no improved performance?įor starters, the weight difference is evident. Many contractors and architects want to determine the cost-benefit between going with a 1 lb MLV versus a 2 lb MLV product. Difference between 1 lb and 2 lb Mass Loaded Vinyl: On metal stud systems, the STC will be significantly higher. On Wood Stud systems, 2 lb Mass Loaded Vinyl can achieve an STC of 51. Museums, Libraries, and other civic projects.Mechanical areas needing low-frequency attenuation.Single Stud Walls when there are significant schedule constraints.Applications for 2 Pound Mass Loaded Vinyl: For projects with significant schedule constraints, this may be the best option. An added benefit of using a single one-pound sheet is that, while the cost may increase, there may be some schedule savings due to the single layer. See the INSUL model below for its STC performance on a single-stud wall. This can come in handy in frequencies below 500 Hz, when increased attenuation is required. While not as cost-effective as the Wall Blokker soundproofing membrane, 2 lb MLV does have good low-frequency performance for vibrating and reciprocating equipment. This is an extremely heavy soundproofing membrane that is used to block noise from loud areas, such as mechanical closets or electrical rooms, from penetrating into quieter areas. NOTE : Amazing Bargains USA is a reseller of excess inventory, overstock and returned products, and as such there is a risk that the manufacturer of this product may not consider Amazing Bargains USA an authorized retailer/dealer of its products and therefore may NOT provide user support or honor its manufacturer's warranty.For those that have worked in museums, libraries, and other specialty civic projects, you may have noticed the tendency for architects to use 2# MLV, or 2 lb/sf (2 pounds per square foot) Mass Loaded Vinyl. ![]() Heavy - weighs 1 pound per square foot or 100 pounds. ![]() ![]() More options available at Burning River Buys
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