![]() Second sound waves are fluctuations in the density of particle-like thermal excitations ( rotons and phonons ). Normal sound waves are fluctuations in the displacement and density of molecules in a substance The phenomenon of second sound was first described by Lev Landau in 1941. It is known as "second sound" because the wave motion of entropy and temperature is similar to the propagation of pressure waves in air ( sound). Its presence leads to a very high thermal conductivity. Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. *Consider using weatherstripping on the inside of the window frame to help create a snug fit and to prevent air leaks.Quantum mechanical phenomenon in which heat transfer occurs by wave-like motion Lastly, attach handles to the outer MDF board to make making moving the plug easier.To further secure them, use a staple gun. Attach these materials to the MDF with bond or spray glue.For the next layers, repeat the process of measuring and cutting to fit for the neoprene foam and mass loaded vinyl.The goal of a window plug is to be as snug as possible. Cut the MDF board according the measurements in step 1.You should allocate roughly half the depth for dead-air space to help combat low-frequency noise. Measure the interior window well's length, width, and depth.Materials: One 1/2" x 4' x 4' MDF, Green Glue, acoustic foam, fabric, neoprene mat, spray glue, weatherstripping tape, and handles.Tools: Saw, Drill, Screws, Square, Utility Knife, Hammer, Level, Caulking Gun, and Stapler.Some are the opposite and feature a deep interior window well and no exterior sill. THERMAL SOUNDWAVES WINDOWSThe style of and window and it's size are the two most important factors to consider when creating a window plug.įor instance, some windows feature an exterior sill and are flush or near flush with the interior wall. While plywood or OSB can be used, MDF is heavier, and therefore, it blocks out and reflects soundwaves a lot better than these two materials.Īny of the above-mentioned panels or mats can be used to construct a window plug, though a combination of the above materials will result in better sound absorption and reflective properties. Common Materials Used to Make a Window Plug Simply investing in a solid color or print fabric to adhere to the back of the plug should suffice. It largely depends on the size of the window for example, smaller windows may not need the support, but larger windows likely will.Ī cause for concern can be the aesthetics of the plug. However, do note that not all window plugs will require structural support. MDF is a heavy material that will help to block and reflect sound-waves whereas plywood and OSB won't. These materials may be attached to a structural support, such as medium density fiberboard (MDF), plywood, or oriented strand board (OSB). This means it can keep sound confined to a space as well as prevent it from transmitting to adjoining spaces. MLV is essentially a reflective sound barrier, it does not have absorption qualities. They flow when a force is applied to them and then return to their original shape when the force is removed. Materials like MLV and Green Glue can do both. Elastic: The ability to deform while still being able to return to its original shape.Viscoelasticity describes two concepts: viscosity and elasticity. While window plugs can effectively soundproof a window and prevent thermal energy loss, there is one downside: they block out the view and prevent light from coming through the window.Īs mentioned, window plugs can be either permanent or removable, so if you still want to use the window for its intended purpose, a removable plug is a much better option. Window inserts also act as a thermal insulator as they're able to seal gaps that allow for heat transfer to occur. While soundproof windows exist in the form of double/triple pane or laminated glass, not only are they expensive, but so is the process of replacing your existing windows. Soundproof window plugs increase the STC of a window, and as such, they effectively reduce unwanted noise transmission in other words, they effectively prevent soundwaves from traveling in and out of your windows. Glass is notorious for having a low sound transmission class (STC), the rating that is used to indicate how well a structural element attenuates airborne noise. It helps to prevent air, noise, and light from entering and exiting a space. A window plug is either a permanent or removable insert that sits on the inside of the window. ![]()
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