Instructables: "Soundproof Your Garage Walls (Using My Cleat Method)"

Low on funds? How about this article from Instructables on soundproofing on the cheap. The method presented here is similar to using resilient channel to isolate the wall from the outside wall.

This design may not meet building code, since the inner wall seems not to be attached to the outer wall. The author has not yet tested the actual soundproofing effectiveness of the design.

Soundproof Your Garage Walls (Using My Cleat Method) - More DIY How To Projects