max Sound Absorbing walls in the following scenerio

Hello again. . Please can some of you experienced and wise men/women help me with my studio planning, by considering my scenerio and offering advise as to what type of walls I should make, and what type of sound absorption I should use for the space I have for the floor and ceiling (plus loft). . Anyway, here is my scenerio. . I live in a 1 bedroom 1st floor flat. Under my flat is a bedsit, and above my flat is an empty loft which I have access to. The building I live in is fairly old, so I am not sure as to the thickness of the walls. The building is within a highly dense residential area, filled with flats of people all around me, and a motocyle work shop accross the road. (oh, and a road next to one of the external walls). . After I put in window plugs to give me my first level of isolation. I plan to build an isolation booth in my bedroom, which I plan to use to record vocals, some acoustic instruments and to do basic level mixing in. . As I do not have enough space to build a room with a live sound, and I want to use the room for mixing, I am planing to build a room that is as absorbant as possible. . i.e. in order to make a pseudo hemi/semi-anechoic isolation booth. . The studio is only to be used in the daytime and not at really high levels (only for mixing bass), however, as I live in a residential area, I really want to get the highest level of stc in order to keep my life and my neighbors lives peaceful. I am especially interested in getting the best bass freq absorpsion as possible. . I plan to build this booth over a period of several months, so the budget is variable. I would prefer to save and wait in order to create a well absorbant room than do it on the cheap and end up with poor isolation / absorpsion. . I have already decided on the dimensions which fit into one of the golden ratio's that reduce parallel mode problems. . I have allocated 20" for the combined thickness of the walls, that is inner shell wall and outer schell wall combined. (40" in total for both sides of the booth if looking at on a width or length plane). . I have only 15"s to build a floating floor and some type of ceiling within the room in my flat, however, I do have access to the atic in the flat, which gives me another additional couple of feet of height to put some type of sound absorbers (bass traps). . The atic is built on top of my flat, and is within a new roof that is built on top of the 1st floor, which originally had a flat roof. The flat roof is still visible and is still in relatively good condition. . I have also access to under the floor, so I am able to fit insulation under the floor boards. . I believe that although I do not have much height in the room I am building the isolation booth, I do have some hidden space under the floor and extra height in the atic. . Now, I am planning to build two 6" wide walls that have 6"'s of spray cellulose fibre in. As I want to make the room as dead as possible, I plan to use acoustic fabric on the inner surface of the inner wall, with only 2 leaf's of dry lining on the outside of the inner wall. . And for the outer shell of the outside wall, I was planning to use 4 leaf's of drylining. And perhaps try and work out some type of trap design, using layers of other materials in order to bounce the energy between the reflectors and absorbers so that the energy eventually gets absorbed and leaves the inner room dead as possible and isolated from the outside of the building (so that the neighbors do not get disturbed. . I have also left about 5 or 6"s in the design for an air gap between the two walls, which I also plan to fill with open cell foam insulation. I think that my initial plan should give me a fairly good level of isolation and absorpsion, however, if anybody see's any problems with my preliminary design. Please let me know ans say so. Also, if anyone has any better solutions to my sound proofing and acoustic problems, please also let me know. . Just to recap. . Room within a room on basic floating floor. . Wall one constructed as follows: 4 leaf's of drylining on 6" wide wooden frame / metal resilient mount / 6" spray cellulose fibre (with maybe an additional reflector layer of drylining or barrier sheet / Mineral loaded vinyl). . Some parts of wall one will need to be fixed onto wall of flat with rubber resilient layer inbetween wood frame / drylining. . Inner wall constructed as follows: 2 leaf of drylining on 6" wide of wooden frame / metal resilient mount / 6" spray cellulose fibre / acoustic fabric. . Inbetween inside and outside shells will be air gap of approx 6" which i would like to fill with spray open cell insulation foam. . Floating Ceiling attached to inner shell made in similar way with 6 " of spray cellulose fibre and covered with acoustic fabric. Leaving only a small 3 or 4" gap between the top of the inner shell ceiling and the real ceiling of the flat. Filling this gap again with open cell foam. . To add to the sound absorpsion and isolation, in the atic, I plan to build an absorber that covers the entire ceiling surface area of the room that houses the isolation booth. . This absorber will probably be constructed as follows: 6" wooden frame that is laid on floor of the atic. On the bottom of the frame, I plan to put a think sheet of ply in order that the insulation absorber panels can be taken away. After the ply, I plan to put a 6" layer of spray cellulose fibre, finished off with a 2 leaf layer of drylining. and maybe an additional layer of barier mat in order to reflect and absorb as much sound energy as possible. . For the floor, I first plan to fit in between the floor boards 703 or similiar semi ridgid fibre glass. . On the top of that, I plan to build a simple floating floor perhaps using something like LAMELLA placed on top of a wooden frame filled with rockwool, topped with 2 layers of ply, that rests on some type of neoprene spring. . Anyway, not sure i am being either excessive or could utilize the space I have by designing better traps within the walls/ceiling/floors. . Anway, appreciate any help and constuctive criticism. Thanks

Dude, too long post! Why not posting a picture?

Do you have any room measurements or booth measurements you would like to show us. I know a lot about your project but do not know the first dimension of either the room or the booth ;) It seems to me that if you can give up 20 inches to your booth walls you could give it up to your whole room and be done with it.

Sure, . I understand what you are saying, although my room is small. I still would like to create an isolation booth, even a small one, rather than treating the whole room as one, as I want to isolate the sound source from the engineer and his equipment in order to get a better quality recording (less noisey recording). . I do not want to pick up computer noise, mechanical noise or engineer noise and would like to give people recording a private and professional environment to record in. . Some of it is psychological I guess, as I have worked with inexperienced people before in more make shift environments and generally, inexperienced people treat you how your studio looks. If you have a simple recording set up - they will treat you like a smuck even if you are a grammy winning genius. If you are a smuck with 0% talent/experience/knowledge/skill, but have a purpose built high spec studio with a console with a million channels then the inexperienced musician/vocals will treat you like GOD. . This is simply how people are these days. . I am also using this project to learn as much as I can in studio design, so that when I move to larger premises, I will have the knowledge to build a high quality recording space. So, every aspect of the design process that I gain an understanding in when designing my small isolation booth studio can be used when designing and building a larger studio at a later date. . I also plan to build the inner room of the isolation booth in panels that can be carried through a door way, so that the booth can be dismantled and rebuilt at a later date, so that the money spent on materials will not be lost. . This week I am working on a new plan of the isolation booth which I will post up as soon as done. . Anyway, thanks for advise and help. Cheers

"If you are a smuck with 0% talent/experience/knowledge/skill, but have a purpose built high spec studio with a console with a million channels then the inexperienced musician/vocals will treat you like GOD." If you can't dazzle them with brilliance ... baffle them with bull shit :)

or better still, do everything yourself, so you do not have to deal with anybody's hang up's and distorted perceptions of what is truly there. The old ego. Plays tricks with even the most sane man's mind... And thats for people who are straight, psychologically balanced and humble. Imagine what the old ego does to inexperienced wanna be rock stars who are smashed out of their head who think their the next big thing with out any evidence to back their delusions up... Thew! what a night mare. Thats why my philosophy is to be as self sufficient as possible, and employ people to do a job once you have all the parts of the puzzle in place... Then you are always the boss and you don't have to take any flack off anyone. sweet!