Walls in a bunglaow stlye 2nd floor

Hi, I have searched this site extensively and found alot of great information. however i still have a few unclear issues pertaining to my situation. i am planning on builing a control room on the 2nd floor of my bungalow in a spare bedroom. the walls are 3/8" drywall nailed into 2x4 studs spaced 16" on center. the ceiling is sloped on opposite sides (bungalow style) and there are two crawl spaces on the sloped sides of the room giving acces to behind the walls. My plans are to A-- cover the walls in auralex sheetblock.( very dense vinyl) screwed in. then on top of the sheet block i was going to use a layer of OSB, MDF, plywood, or sound board. lastly i was going to put a layer of 5/8" drywall as an outer layer. My questions are: 1. which of the osb, soundboard, plywood or MDF would be best as a middle layer for soundproofing? and if so what thickness? 2. Should i use resilient channel for the outer layer of 5/8" drywall, and if so which version of it. (RC1 , RC2, RC8?) 3. I have been seeing alot of talk of fastening schedules, but i cannot find what they are. for my situation what would be the appropriate screw type, length and fasteing schedule for each layer. My primary goal is to keep sound from leaving the room as much as possible---- my secondary goals is to tame resonances with the room so i can mix. i was also considering joining the studs together with 2x 4s to brace the wall so it is stiffer. would anyone recomend this? i thank you for your help.

Ok, the principle to "soundproofing", or isolation, is Mass-Air-Mass (refered to as m-a-m). Also Mass loaded vynal is frowned apon as the price performance ratio is way off other more widely available materials. Do some searches on these things, and there should be plenty of info to get started. Start here; http://www.saecollege.de/reference_mate ... lation.htm oZ

Hi, thank you for your reply. I dont have the space to do what you are suggesting. i understand alot of the principles of how it SHOULD be done, but for this scenerio i just need to get it better than it is now. I have had good results with sheet block in the past which i why i chose it. My main questions that i need answers to are still. 1.) what is the proper fastening schedule and screw lengths i should use. and 2.) for low freq attenuation will i be better of NOT using RC? 3.) out of OSB, MDF, soundboard or plywood which would attenuate LF best. Ive read alot of other posts in this forum of people doing things similar to the way i am trying to go but cannot find these specifics. If i were doing things in a commercial building i would do it much differently, but this is my house and my main goal is a simple room that is somewhat controlled that wont wake my son when he is sleeping. thanks again

Mike, any possibility you could draw us a sketch of your space including dimensions of your "access" behind the walls? Something with enough detail to allow me to build your room (if I wanted to) would be nice... Steve BTW, if you download this document http://irc.nrc-cnrc.gc.ca/pubs/fulltext/ir761/ir761.pdf it gives schedules on pages 10-14, along with some 350 walls built and tested...