Talk:Sound transmission class

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The "what can be heard" from STC values is inaccurate. For example, loud speech is definitely audible through STC 45 construction. Complaints are likely from residents in condos built to meet STC 45.

Epwolfram (talk) 23:09, 21 February 2011 (UTC)


what is Noise reduction class —The preceding unsigned comment was added by (talkcontribs) 04:43, December 30, 2005 (UTC)

The article states that STC ratings before 1999 would be unreliable, however the chart of values was taken from a book published in 1994. —Preceding unsigned comment added by (talk) 20:58, 30 September 2009 (UTC)

Merge outdoor-indoor transmission class here?[edit]

Outdoor-indoor transmission class is a very short, and also confusing article. If I understand correctly it is a sound transmittion class, that maybe can be covered in this article instead to get it explained in context. // habj 21:16, 14 February 2007 (UTC)

sounds like a good Idea to me

Anruari 14:24, 8 October 2007 (UTC)

Sound transmission class does not make it crystal clear than 1B corresponds to a factor of 10 instead of (for example) 2. It also says that a 1B difference ``corresponds to the human ear of a factor of two, which muddies the issue. Say ``logarithmic does not help completely, since (for example) some computer scientists describe algorithm lengths in terms of base-two logarithms.

Perhaps change

 ``The dB scale is a logarithmic one and the human ear perceives a 10dB reduction in sound

as roughly halving the volume - a 40 dB noise subjectively seems half as loud as a 50 dB one.

 ``The dB scale is a logarithmic one, with a 1B difference corresponding to a factor of 10

in sound energy. The human ear...

Julyx (talk) 00:15, 17 July 2008 (UTC)

sound damping techniques[edit]

This is complete bull shit. There's no way adding fiberglass batts only adds 3 db or so to the STC but doubling the sheetrock along with insulation brings it to "up to 45" meaning that the sheetrock accounted for more than -3 db/more than the insulation batts. This article is about as reliable as a contractor with out of state plates. Daniel Christensen (talk) 23:08, 30 October 2010 (UTC)

Sorry Daniel you dont know what you are talking about. I work in this area. For a standard in-house wall as described adding some mineral wool into the cavity with no other changes will only provide a small increase in sound insulation. Ditto with simply overbaording the wall with more drywall.

If you want to see evidence for this look at the sales literature from the manufacturers of Draywall boards. I cant be bothered to seek out the American literature. I dont work in the USA and they use STC based on their own standards, where the rest of the world uses the ISO series of standards, therefore use Rw (SRI) or it's site based equivalents.

The British Gypsum data is clearly available in their "White Book" which is available online. here

It can be seen that there are differences by between 3 - 6 dB obtained by introducing "Isowool" into a wall with otherwise identical boards and studs.

To gain large improvements in sound insulation the independent stud systems Here or Here can be employed to obtain very large improvements in sound insulation.

Anruari (talk) 15:45, 23 August 2012 (UTC)