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: Soundproofing a window  (Read 3446 times)


  • Guest
Soundproofing a window
« on: January 29, 2015, 06:52:19 AM »

Hi, I am trying to soundproof our kids bedroom in our house from highway noise. It seems that most of the noise is coming through our windows; I was able to measure 55 dB close to the windows using a smartphone app.

I was looking at the magna seal system, but I am not really sure how I would install it on our existing windows (pictures attached). The existing windows are double-hung windows with a really complex window moulding and there is very little space for attaching the steel frame. Even if I were able to attach it somehow, it will result only in ~0.5 inches of space between the lower pane and the acrylic panel.

Do I have to replace the whole windows or is there a simpler solution?

Thanks for any response

Randy S

  • Guest
Re: Soundproofing a window
« Reply #1 on: January 29, 2015, 08:48:32 PM »

are those Milgard windows? quiet line? from zooming in on the window I do notice a nice air gap between the panes....which is good to see...
How much reduction do you see from the current windows?

The remaining space that is left to work with is not enough to give an air gap that would deliver cost effective results, however you might be able to remodel the window trim to bring it out further in the room to gain the additional space required to achieve a quality reduction.

before you jump to replacing the windows lets compare cost vs. reduction with all options that are possible.

Randy S.


  • Guest
Re: Soundproofing a window
« Reply #2 on: January 30, 2015, 05:08:31 PM »

To be honest, I don't know what the brand is. The windows were installed by the previous owner of the house.

I measured the noise level this morning and the average numbers were around 67dB outside and 49dB inside. Both measurements were performed close to the window.

Randy S

  • Guest
Re: Soundproofing a window
« Reply #3 on: January 30, 2015, 05:33:05 PM »

18 db loss is pretty good considering that most windows will not even deliver that much reduction.

If you want to improve the system I would suggest that you look at extending the window box .
I do not think that replacing the windows will be that much of an improvement over what you are getting today, maybe even less of a reduction with other brands.

The next step is to get the second pane system in play with a 2" or greater air space and even then if you get down to 40-43 db you would be at the end of the cost vs. reduction value of this type of project on single wall construction.

Randy S.