Hats off to The Foam Factory. If you’re thinking about making a home recording studio for Scambaiting visit their website. https://www.thefoamfactory.com/acousticfoam/acousticfoam.html. Their prices much lower than the retail outlets.
I put some of their 4 inch wedges on the wall that separates my two bedrooms. Now it's much quieter in my recording room. Now I can barley hear my PC's fan running. ...and it makes it easier for my house mate to sleep when I up moving around and editing video at night.