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Brutalessons -> RE: Sound proofing over existing construction (5/10/2013 11:23:30 AM)
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Dense pack cellulose is a fairly good sound barrier and can be easily done from either side of the wall, yours or hers with minimal prep.
The steps require cutting a single 2 inch hole between each stud bay of the wall , then inserting the blower hose into that opening and filling it. Once process is done, seal and tape the whole using drywall mud, sand, prime and paint. Only difficulty may be in what form of insulation is already in place. Regular fiberglass bats are no problem but yellow, sound attenuated batting is much denser and more resistant to compaction. Many insulation contractors will do the cutting of openings and filling of the walls for under a dollar a square foot.
Another option would be building a secondary wall on the existing one using "Z" channel and attaching a new layer of sheet rock, typically 1/2", to that "Z". by doing this, you are creating a dead space between the two surfaces which limits the ability of the sound to transfer by conduction. This builds out the room it is applied to by approximately 1 1/4 inches and can be taped, sanded and painted easily. total cost would be about 10 dollars per 32 square foot. if doing it yourself pay attention to the length of fastener screws as you do not want to come in contact with the original wall as it forms a conductive bybass that will defeat the sound resistance.
Note, doing both, Dense pack from her side, "Z" channel from yours and all but the most arduous noises will be effectively blocked. I say this because the "sounds' you are trying to deal with are probably Voice not the heavy thumping base of a punk rock band and in the higher ranges, dampening works fine for all but the loudest of protests.
Also note, neither of these would be true "soundproofing' rather noise suppression measures. Full sound proofing can require extensive and expensive measures from floating floors and ceilings, non paralleled surfaces, custom surfacing, false walling and channeling and can run into the 100,000 dollar range (think sound recording studios, of which I have designed and built two professionally).
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