Re: soundproofed shed for cnc router
The goal in a music room is to eliminate all stray sounds, the goal with a generator is to just quiet it down to a reasonable sound level. So I would say the generator soundproofing would be what you want. Building a shed and insulating the walls with common fiberglass insulation and sheeting with sound deadening board would probably get you what you want. A closed cell ''foam rubber'' like material (egg crate mattress cover) would work for insulation also as long as it's covered with something (tarp material?) because it will pick up sawdust like crazy. We used the closed cell foam method to go on the inside of punch press enclosures to quiet them down. My router is in an insulated shop and once the doors are shut, it's quiet outside. Inside, you have to wear hearing protection.
Jim Dawson
Sandy, Oregon, USA