Egg cartons they are about a foot sq and by now probably cost about 10 cents each. I used them to pack machine parts in when I had my machine shop. I have heard of them used by garage bands to deaden sound. Jim
He's got it right!!!! Many years ago my parents bought a building and converted it to art and music lesson studios. I was asked about designing walls to separate practise rooms. Imagine one student practising trumpet in one room and another doing harp in the adjacent room. I came up with the same thing Peter suggested except that the 2x6 bottom and top plates were separated from floor and ceiling by a layer of acoustic board and secured with as few nails as practical. The insulation was just the usual "pink" but the acoustic blanket would probably be better. It worked well. We never got a complaint.
All good suggestions from Peter. Concrete block works very well. To add to an existing wall, apply sound board (Homosote) and 5/8" drywall, one or two layers. Resilient furring channel can be used. Use acoustic caulk at all the cracks, sound seals at the doors. I used to have a book published by US Gypsum, a drywall maker that spec'd various wall constructions for sound walls among others. A Google search might turn up something. I built a 12 screen movie theater that used double studs, Fiberglas sound batts and three layers of 5/8" rock on each side and one layer in the middle to isolate the theaters. That worked real well. It all depends on budget and available room. Tom
I worked at a construction site for a x-ray lab. On the walls they used what looked like plain old sheet rock, but it had a layer of lead sheet under the paper on one face. It probably would be wonderful stuff for noise too. The gent installing it said it was spendy! Greg
The best, cheapest, and easiest way to insulate the shop noise from the house , is to remove any and all equipment from the shop. I'll even help you. Just let me know what size box truck I'll need, and what day you want to do this. I'll be gone, the equipment will be gone, noise will be gone, and you'll be left with peace and quiet. ;-) LMAO Getting the hand truck ready, Ron