Other additives are included for strength, such as the carbon fiber mesh for exterior applications (known as reinforced MLV), or UV additives for applications that are exposed to the sun for long durations. EVA membranes, on the other hand, are naturally pliable, and do not require plasticizers.
Unfortunately, plasticizers break down over time, and they “off-gas” at room temperature, leading to unpleasant odors. PVC is a naturally rigid product (such as vinyl siding on a home), so an additive known as a plasticizer must be added to give it flexibility. When it comes to Mass Loaded Vinyl, there are 2 primary polymer bases – PolyVinyl Chloride (PVC) and Ethyl Vinyl Acetate (EVA). See a Video of How Mass Loaded Vinyl is Made Other machines require a full machine-line shutdown, which can result in long lead times for custom thicknesses. Some extrusion lines have a variable dye, allowing for quick changing of MLV thicknesses. When the vinyl is properly mixed, it is extruded through a dye, and quickly cools and hardens onto cooling rolls, where it takes its final shape. The most common mass-loading additive is calcium carbonate, although in the past others were used, including lead and barium-sulfate. This liquefies the polymer pellets and mixes them with any additives. MLV is produced by extruding a polymer through a screw and chamber at high temperature and pressure. 1 psf Mass Loaded Vinyl is 1/8″ thick, while 2 psf is 1/4″ thick. While the weight changes, the density seldom does, so in reality the thickness changes as well. The most common areal weight for Mass Loaded barriers is 1.0 lb/sf. These are commonly between 0.5 pounds per square foot, and 2 pounds per square foot. Mass loaded vinyl comes in lots of thicknesses and weights. What STC does your wall need to achieve? Often times it’s 45 in office buildings, 50-55 in apartments and condos, and 65+ for proper soundproofing of theaters and music studios. Often the first step is to determine what your target STC is. By defining your requirements and understanding the pros and cons of various additives, you can select the best mass loaded vinyl for your project. We’ve broken down the most common variables for Mass loaded vinyl below. To make matters worse, there are trade names to navigate (often private labeling vinyl from the same plant) and loads of misleading marketing info, with outlandish STC claims. Most sources are simply resellers, and don’t even manufacture the vinyl barriers themselves. We could use channels in the bedrooms (9' ceiling) but the bathrooms and hallway are only 8', so channels would cause us to lose a lot of height and a number of items (sprinkler heads, fans and lights) would have to be lowered a lot.With so many types of mass loaded vinyl out on the market, it can be a tall order to select the brand and MLV type that is best for your project. Is there any reason why adding green glue compound to the 5/8" drywall would not work or shouldn't be used? I'm contemplating off adding either 5/8" drywall with Green Glue or 5/8" drywall on top of a layer of 1lb MLV to our existing ceiling to reduce the noise.
The result is we can hear them walking around a lot. Whereas the neighbours over the bedrooms replaced the carpet with hardwood/laminate flooring and I have a feeling that they didn't install the 73STC rated underlay as outlined by the bylaws. The neighbours over the kitchen and living room area are keeping their carpet and we can hardly ever hear them, even in their tiled kitchen. Once all strips of MLV have been applied, sheetrock can be installed above it and you can be ensured a sound-secure structure! For more information about MLV, contact us or call us at 84.ĥ0) Dietrich: We live in a townhouse that has two townhouses (side by side) on top of it. With a utility knife, use a straight edge ruler to cut a square edge evenly through the MLV. Please read through the installation guide before installing your MLV. Mass is a critical component in sound control and works by simply stopping sound from being able to vibrate the structure due to its heavy weight. Mass Loaded Vinyl can be applied to walls, ceilings, floors and structures to create a sound barrier.
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