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[js63]

Anyone have any opinions on which would be "better" for soundproofing over existing Andersen windows (STC 25) - Soundproofwindows.com or Milgard?



It appears that you can specify the desired STC up to 47 with Milgard.  Soundproofwindows.com is less "precise" - it depends on what you have up already, and what the air gap between the new & existing window would be.



We'd have a 4''gap between the existing glass and the Soundproofwindow.  Would this truly yield STC's in the mid 40s?



Also - are Milgard "truly" the STCs that they advertise?  Are these tested/certified by any independent labs?



Quitehomewindows.com is also advertising now, and they have lab tests posted on their site.  This is the kind of independent, third-party info I like to see..not sure why SPW.com doesn't have the same lab tests published.



Anyone have any experiences - good/bad with either of these - Soundproofwindows.com or Milgard?



Thanks!

[supersoundproofing]

The STC numbers on all these windows appear good, but look at the frequency of the sound you are having a problem with- if it is low frequencies, these windows may not perform much better than hardware store windows!

The STC is a basket of frequenies averaged and can lead to mis-leading comfort levels.

An "interior" window may work better as it traps air in the cavity between it and the old window, thusly bettering the low frequency sound reduction.

See the "Poor Man's Interior Window?"http://www.soundproofing.org/magnetite_windows.htm

Also see the Topic here:  "Soundproofing Windows"

BJ Nash