Looking into soundproofing interior walls. I've framed out 800sqft as a living space in a larger metal building. Only done the exterior walls so far, with 3 of them being on the building's exterior walls. When it rains it's extemely loud, when it hails it literally makes my ears ring. What approach would diy take? My first thought is take down the exterior most walls and create new exterior walls, probably on 2' center to reduce material, sheeted with something sound dampening and then reset the 16" center walls against those to have layered walls. That's a lot of effort and sacrificed space, so I wanted to hear other suggestions before I start. I'm using the loft of the building as the ceiling for the living space, I now plan on making a 2nd ceiling under it to help as well