My friend Charlotte mentioned on Facebook that she's building a "soundproof studio" in her garage and was curious as to how it would work. At least one commenter mentioned the fabled "egg cartons" solution (I hope in jest) but I knew this is nowhere near good enough. Egg cartons and acoustic foam on the walls will not soundproof anything. Acoustic foam is for sound treatment INSIDE the room. To build a "sound proof" studio you need a floating room.

A quick google around turns up some interesting links:

• On this page there is a link to an "Instructables" PDF: http://createdigitalmusic.com /2009/03/12/instructable-how-to-build-a-music-studio-in-an-apartment/
• This is the first in a series about building a home studio: http://revolutionaudio.ca /store/2006_09_01_archive.php#6886430431023584036
• This is an interesting article about 'flanking noise', i.e. noise transmitted through gaps and vibrating structures: http://www.greengluecompany.com /understandingFlankingNoise.php
• If you got some spare land then you're interested in this guy's thread about actually building an actual studio building from scratch: http://www.gearslutz.com /board/photo-diaries-recording-studio-construction-projects/ 161575-manifold-recording-studio-construction-thread.html