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Natural Science Forum / Physics / Acoustics / August 2008How to Acoustically Insulate a Rendered Concrete Wall
Hi List, I am living apartment and I have new neighbors who can be a little noisy at times and it is disturbing my sleep. The common wall between my bedroom and their family room is rendered 125 mm concrete wall, with all air gaps sealed. The width of the wall is about 5m and standard height. From my bed in the room most normal speech is inaudible, but annoying. I can hear occasional words. With my ear pressed against the wall I can clearly hear the conversation. I planning to get a quote off a professional company to insulate the wall, but I really would like some independent advice on the best solutions, not just the solution that they are supplying. Based on the fact that most speech is inaudible is there anyway to guess the wall STC? What do I need to get to a STC around 55??? 50 Very loud sounds such as musical instruments or a stereo can be faintly heard 60+ Superior soundproofing; most sounds inaudible Thanks Mark On Jul 28, 8:01 pm, shofu...@yahoo.com.au wrote: > Hi List, > [quoted text clipped - 27 lines] > > Mark Hi Mark, Have a look in the CSR design "Red Book" called the "Fire & Acoustic Design Guide" you can download it from the CSR website. There is some designs in there that can be used to upgrade and existing Masonry wall. It also lists the expected and sometimes tested STC values. It is a new unit? If so it should be built to certain standards, you should be able to ask the developer if the standards have been met. Also good to seek the proper advice of an acoustic consultant. Cheers Tom > What do I need to get to a STC around 55??? The most practical thing to do is to erect a second wall along side the existing wall. Since it is speech sounds that bother you, drywall (gypsum board) will work well as the noise barrier surface of that added wall. The added wall is best erected on plates placed at least 3" (7.5cm) away from the existing wall. The studs comprising the structure should be 3-1/2" (9cm) wide. They are best placed on 24: (60cm) centers. The resulting cavity air gap, about 7" (17 cm) should be completely filled (but not stuffed) with glass fibre batts. Two layers of 5/8" (14mm) will be effective. Caulk all seams. Tape, spackle and paint to suit. I have found this arrangement, when added to a masonry wall, to easily achieve STC 55-60. > 50 Very loud sounds such as musical instruments or a stereo can be > faintly heard > 60+ Superior soundproofing; most sounds inaudible The existing masonry wal presents a good low frequency sound barrier property but mediocre mid-frequency (speech) property, while the drywall is vice versa. The combination is good as a result. Angelo Campanella |
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