Super Soundproofing Community Forum

Please login or register.

Login with username, password and session length
Advanced search  


Need an answer right now? Go to, or,  FEEDBACK

Or call us toll-free at 888-942-7723 8-5 Pacific time Weekdays. 

  If we're not in, send a email to

You can get a free report on soundproofing by going  HERE


Author Topic: Best architecture for sound proof windows (glass)  (Read 6338 times)


  • Guest
Best architecture for sound proof windows (glass)
« on: April 22, 2009, 06:29:55 PM »

I have a house in Ontario, Canada that backs onto a major roadway.  The master bedroom is back there are there are a series of large windows in there that pass a bunch of noise.  The builder used a window made by "Triwin", a local vendor.  It's a double pane design with a metal spacer.  The air gap is about 1/2" thick between the panes and the glass is really thin.  It's a standard issue, nothing special kind of window.  Sound seems to penetrates as if nothing was there.

I have tried to stop the noise by affixing a thick acrylic sheet 3/8" in thickness around the whole window with a 2" air gap.  This worked reasonably well but the aryclic sheet creaks too much when the sun first rises in the morning (the room faces East).  I have tried to fix it but can't totally resolve the problem.  So for this reason and for a bunch of others I want to simply replace the windows with a good sound proof design and call it a day.

So what architecture will give the best results for killing the sound and also have good thermal performance (it gets really cold here in the winter).  Do I want a triple pane design?  Dual pane with thicker glass and more spacing?  The home was built with 2x6s and has quite a bit of room for the windows.

Is there some online tool that calculates STC based on plugging in dimensions and materials?


Randy S

  • Guest
Re: Best architecture for sound proof windows (glass)
« Reply #1 on: April 23, 2009, 05:58:57 PM »

Well if you want to increase your reduction even more then the 3/8" acrylic system then you have to use 2 sets of double pane windows with the air space, I would recommend Milgard quiet line or

Beiber windows


  • Guest
Re: Best architecture for sound proof windows (glass)
« Reply #2 on: April 23, 2009, 09:24:04 PM »

I have read up a lot and actually called Milgard but they don't have anyone anywhere near me that sells their windows.  I would need to get them shipped from Chicago which would be cost prohibitive for me. 

I have called up a bunch of local window manufacturers and the widest sealed unit they make is 1 3/8".  No more than that.  So even if I stick with 2 panes of glass and use thick laminated glass (6mm is the thickest I can find) the air space is not very big.

The secret behind the Milgard window is that they use what appears to be a standard 5/8" sealed unit (nothing special) but their frame accepts another pane of glass with more than 2" of space in between.  This seems to be the secret sauce.  They also use slightly different glass thicknesses.

So now the question becomes, is there anyone is eastern Canada that builds windows like this, or has sealed units wider than 1 3/8"?

Randy S

  • Guest
Re: Best architecture for sound proof windows (glass)
« Reply #3 on: April 23, 2009, 11:52:16 PM »

Yes you are correct regarding the "secret sauce"  ;D 
The air gap is one of the major keys in sound reduction.
As for a company in Canada I'm not sure of, but here is a link to a company that can do specialty windows and if they cant help might be able to steer you in the right direction.