OK, have to say this topic scared me as I admit I have been running at this new build with little to no knowledge really. I have a guy coming Monday to start ripping the old sheet rock off. I bought 9 rolls of #1 MLV and some acoustic caulk. Guy from Soundproofing america says it just needs to be put on to studs, caulk applied and sheet rock put back over. Somehow I am going to go out on a limb and say that is not going to be sufficient. I have an apartment that is very well built and insulated above my garage. It includes a very sturdy large steel beam that supports the floor. I have already installed a super quiet mini split Mitsubishi ductless A/C, ceiling cartridge style. The biggest thing with this project is, even though I am building this to use as a studio, it is remaining viable as an apartment should I ever want to resell it. All I want really as structure goes is to make it as sound proof as practical with that limitation in mind. HELP!! Don't have time to read Rods book. I admit I have gone so long without being able to do anything I just wanted to get going. I did see about Caulk backer rod. Is that needed along with Mass loaded vinyl?. I have done some speed reading, hard on 3 hours sleep.. and it seems if I basically stop sound as best I can by sealing at the windows, floor,door and ceiling I should be close to golden?. I expect to be called names, should have researched more. Putting my trust in Soundproofing america, can't say if I just am not asking the right questions. He does know what I am trying to do.