Thanks for your question. I've compiled for you a handful of
providers. I tried to find different techniques' offers, but actually
one seemed to be the currently dominant, consisting in adding a
laminated glass to the existing windows. However, for each provider I
found, I quoted excerpts from their own explanations, so you can
compare. I also looked for their pricing, but in no case they were
available. Instead, they ask the customer to contact them in order to
prepare an estimate --somehow, it seems to make sense, since it's very
unlikely that prices could be standardized for a service that for its
own nature needs to be tailored. Therefore, contact information has
been included for all of them.
Besides the information on vendors, I included in the end a couple of
informative resources that I believe you'll find quite helpful.
Search strategy: "soundproof windows" and "soundproofing windows"
Vendor: Soundproof Windows = http://soundproofwindows.com/
Technique description: http://soundproofwindows.com/product_overview.html
"Soundproof Windows do not Remove or Replace Your Existing Windows
"Soundproof Windows rehabilitate your existing windows!!! "There is no
need for window replacement.
"Windows and Doors are the Noise Problem
"The noise problems are seldom the walls, but are always the windows.
Only in extreme noise environments or very poor construction
situations do the walls require any special noise abatement
"Our soundproof windows are second windows placed behind your existing
windows. Our windows insulate, stop drafts, soundproof and more. They
open and close just like your existing windows, and offer more
benefits than replacement windows - at a significantly lower cost."
"Double Pane Windows have Poor Noise-Stopping Capabilities
While double pane windows do stop a little more noise than single pane
windows, IGU (dual pane) glass is not very effective.
"In a double pane windows, the two pieces of glass are coupled within
the same frame and vibrate together - like the two tynes of a tuning
fork. The air space does very little to retard the vibrations. (...)
"For more information about double pane windows, and what can be done
about them, please see our Double Pane Windows page
"Why Our Windows Work to Reduce Noise
"First, we use laminated glass. The inner PVB layer of plastic stops
vibrations - like a finger on a tuning (...)
"Secondly, there is an air space between the two windows (the existing
window and the new Soundproof window), so the frame is isolated from
"Finally, we spring-load the seals in our frame, which puts a constant
squeeze on the glass panels. This constant squeeze prevents sound
leaks and helps stop the noise from vibrating through the glass.(...)
"We have tests that show up to an STC of 53 after installing Soundproof Windows.
"STC stands for Sound Transmission Class.
STC ratings are an established way to average how much sound is
stopped by something. STC ratings are used for windows, doors, walls
and most building materials. For windows, STC ratings range from 18 to
"For single pane windows, the STC Rating is most likely between 20 and 27.
Price: Not available. Estimate request for at
http://soundproofwindows.com/form.html or email@example.com
Other Contact information:
47630 Kato Road
Fremont, CA 94538
East Coast Office
Vendor: Super Soundproofing Co. (http://soundproofing.org/ )
Technique description: http://soundproofing.org/infopages/interiorwindows.htm
(It's basically a short version of the same technique explained by the
previous vendor, including a copy of the same diagram --logo included)
"If you need REAL sound reduction, interior secondary soundproof
windows may be the solution. An 80% sound reduction and more can be
had over the performance of the prime window!
"These windows are made to fit inside the frame of your existing
window, inside the living area, providing a large airspace between the
existing window and the new one. This DEAD AIRSPACE increases noise
Price: While this provider shows prices for other products related to
other areas of soundproofing
(http://www.soundproofing.org/sales/prices.html ), for what relates to
windows, they also ask to contact them via form at the same page where
the technique is explained
Walk-in store at 455 EAST CARMEL ST, SAN MARCOS, CA. 92078
Vendor: West General "Acoustic Solutions and Environmental Control"
Technique description: http://www.westgeneral.com/products/soundproofwindows.html
(Again, the technique described is the same as for the first provider,
with an identical diagram, save that in this case the explanation is
"As an acoustical materials supplier, we often hear complaints about
outside noise getting into houses and buildings. (...) The largest
reason for this is due to poorly insulated windows and doors. (...)
While typical code requires an STC (amount of sound that is
transmitted through a medium) rating of at least 50 on walls, most
windows only provide an STC rating of 30 or less. (...)
"Old Methods of Noise Reduction
"Double Pane Windows
"Until now double pane windows have been the easiest way to handle
noise isolation and energy conservation issues. While excellent at
saving energy, the standard double pane window only has an STC rating
of 30; thus creating a weak point where sound can pass through.
"Clear Vinyl Barrier
"Using a clear vinyl barrier over your current window system is an
effective, yet temporary way of stopping noise from getting inside.
While a useful and cost effective technique for homes, many
applications require a more permanent solution." (This more affordable
technique is described by the same vendor at
"Introducing Soundproof Windows
"The Soundproof Windows system is placed behind your existing windows.
The system does not require the removal or replacement of your
existing windows. Soundproof Windows operate exactly like your
existing windows, and can open and close as your existing windows do.
The Soundproof Windows system insulates, stops drafts, soundproofs,
and more due to its laminated glass construction.
Using laminated glass, Soundproof Windows block ultraviolet light
which causes sunburn, color fading and deterioration of natural and
synthetic materials. Historically museums have always used laminated
glass to provide color fade protection for their displays."
Price: Again, as it begins to seem the norm, price is not available.
Toll Free: (800) 801 9378
Phone: (408) 255 8644
Fax: (408) 255 8677
Vendor: Milgard Windows (http://www.milgard.com/ )
Technique: Not explained. There's a page for "Sound Control Insulated
Windows" (http://www.milgard.com/products/sound-control-windows/ )
which introduces the Quiet Line (TM) Series Vinyl Windows.
Prices: Not available.
Customer service line: 1-800-MILGARD
Contact form page: http://www.milgard.com/contact-us/
Locations (http://www.milgard.com/about-milgard/locations.asp )
7406 W Detroit Street
Chandler, AZ 85226
2451 Bert Drive
Hollister, CA 95023
6050 88th Street
Sacramento, CA 95828
355 Easy Street
Simi Valley, CA 93065
26879 Diaz Road
Temecula, CA 92590
17450 E 32nd Place
Aurora, CO 80011
3505 Thayer Ct, Suite 200
Aurora, IL 60504
7600 Eastgate Road
Henderson, NV 89015
20789 SW 115th Ave
Tualatin, OR 97062
Salt Lake City
1000 South, 500 West
Salt Lake City, UT 84101
10846 Houser Drive
Fredericksburg, VA 22408
965 54th Ave East
Tacoma, WA 98424
3800 136th Street NE
Marysville, WA 98271
I didn't find anything else relevant about providers. But there are
two other resources that I believe you'll find interesting to
orientate your decision.
First, a specific user's forum. This particular thread
) has two pages of customer's recommendation exchange beginning in
2003 up to August 2005.
Also, I believe you will find illustrative the following article that
explains the outlines the basics of windows' noise problems and
I hope that you find my answer helpful. In any case, please do not
hesitate to ask for clarification if you find it necessary.