To soundproof your room you will need to use a combination of materials. The following video link is a brief demonstration on blocking sound: http://acousticsfirst.com/educational-videos-the-barrier-and-the-bell.htm We use a mass loaded vinyl called BlockAid. (http://acousticsfirst.com/blockaid-vinyl-sound-barrier.htm) This can be added to structural composites to increase mass without loosing valuable space and can be used in conjunction with resilient channel, isolation hangers and acoustical sealant. Always line cavities with insulation. This prevents resonant frequencies from ringing in the cavities and increases the STC (Sound Transmission Loss). To keep structural noise from transmitting through the structure, be sure to isolate materials using resilient clips or resilient channels. Sound and noise can be transmitted structurally through any materials that touch without some type of resilient material between them. Once your structure is complete, you can use acoustical treatments within your music room to absorb sound and improve the quality of sound in the room. Even though acoustical panels do not block sound, they will help reduce the overall sound pressure in the room, much like the fiberglass batting that is used with the barrier material in the video. A drywall ceiling may sag if the contractor did not use drywall meant for ceiling applications. Be sure to check with material supplies to confirm that you have the correct material for your application. Here is a link that might be useful: Soundproofing Demonstration

If you do a search, you'll find that there have been several threads on this topic recently. In terms of what it is called, you want to provide sound attenuation. You would never "sound proof" your house. It would be ridiculously expensive (if you could even manage it), and it would be very uncomfortable. I am an audiologist (although I no longer practice), and I find that being in a "real" sound proof room is a very weird feeling. Almost suffocating... So, what you would be looking for is a product that would help to decrease the transmission of sound between rooms. You need to determine what dB level of noise transmission would be acceptable to you and from there you can begin to plan the products and strategies to make it happen. You can work with an acoustical engineer to come up with the correct formulas, but you will need to take into account multiple factors, including but not limited to flooring materials, ceiling heights, room sizes, etc. Most homeowners never go into that level of detail...it certainly does not sound from your posting that you would very much attenuation. One very easy fix is to use carpet upstairs rather than a hardwood...much quieter.

Perhaps you have solved your problem already - I had the same. Yes, it substantially increases the install cost. I just found out that Floor and Decor has a product by North American ( I think that's the name) You have to call and ask for the sales person in Tile accessories, otherwise no one will have an answer. I can't tell you how many times I was in the store and asked about sound proof for tile and only by accident did I finally get to someone who knew something. It is a peel and stick for stress crack and sound. About $200 for 200SF.

brutuses First you need to identify what type of sounds you are trying to deaden - and what the purpose of the room is ie - Recording Studio, Woodworking shop, home theatre etc.. Differing types of sounds require different types of materials/applications - i.e. foot fall in an upstairs is one of the more difficult to deaden vs. voices Not a pro here by any stretch but I did research this very issue during our remodel when we lost a plaster ceiling in the living room which is the largest room in the house. Also, we finished 1/2 the basement which has been spec'd for future home theatre use. Bro in law is a master carpenter & he re-built many of the recording studios for SONY (I believe they are now defunct fr. recording) In that application - what works best is layers of sheetrock, in various thickness, staggering seams additionally inside the wall insulation - Mineral Wool, brand name Roxul - is a product that has been used for yrs as a firestopping insulation - fairly recently avail in Bat form (just like the pink stuff) easy to apply Mass loaded vinyl - is a 1/8" thick rolled vinyl -like the flooring and is good for floor application. It's heavy! - I had my carpenter use it on the ceiling of our basement, after applying Roxul btwn the joists - I thought he might walk off the job! heavy & difficult to use overhead - after the MLV he had to put up a grid & apply acoustical ceiling tile - which really is homosote (product mentioned above) - Homosote is another good choice - but if cat potty area is an issue this would not be adviseable as it will wick in moisture - Here's our application LR ceiling - J- channel w/acoustical tape applied to joists- This step is critical as sheetrock direct to joists will allow/act as a sound traveler if you will, Roxul btwn the joists, 5/8" sheet rock applied to J-channel. There are other methods, green glues, acoustical sheetrock etc - We choose this route - because it is cost effective, products were readily available and easy to apply. IT has worked remarkably well Basement - as stated - Roxul, MLV, acoustical tile, Roxul is also on an interior wall btwn utility side of basement & finished side. - A thick Exterior door is installed btwn utility/finished side - with rubber gasket around bottom - Hope this has helped - I can't stress enough about determining 1st what you are trying to deaden - In a garage you will have doors, windows, ? ceiling or is it exposed rafters - so if you just do a little -it may be for naught as sound has too many other routes to travel -too many leaks - 1/2" sheetrocked homes are an acoustical nightmare - Here is a sight that is extremely helpful - I purchased some products from them for our projects folks there will take the time to help find right product for your application http://www.soundproofing.org/ This may help too http://forums.audioholics.com/forums/showthread.php?t=33362&highlight=soundproofing Good luck!