1) the easiest way to isolate the sound is to sheathe with drywall.
First you need to fix the frame, then fill it with the material, which actually isolates the sound. More dense materials are best suited to destroy sound. Materials made of fiber having a porous surface. Because material with such characteristics is able to extinguish the sound wave. For example, this technology is used in cinemas and from this sound is well -heard inside the hall, and is not heard in the corridor at all. If we need a greater effect, then you need to create an air layer between layers of material. Materials such as lutrasil and fiberglass perfectly extinguish sound waves.
