Super Soundproofing Community Forum

Soundproofing Forum Topics => Soundproofing Windows and Doors => Topic started by: WebJunk on July 10, 2015, 04:01:59 AM

Title: Window
Post by: WebJunk on July 10, 2015, 04:01:59 AM
I want to soundproof two older style Double-hung windows. The room is being used for playing music inside. I read on here that I should use 2" mats as a window plug. But on the bottom (inside) section of the windows there is less than 1" from the glass to the frame/wall. There is more than 2" for the top inside. I could possibly add glass or acrylic to the outside section although as the window does not measure evenly for some reason it might be difficult to get a tight fit.
Can you offer any direction? Thanks!
Title: Re: Window
Post by: Randy S on July 10, 2015, 03:17:42 PM
Since you do not have enough depth in the sill for the plug I would suggest you do our magnaseal system.
http://www.soundproofing.org/infopages/magnetseal_windows.htm

Do not worry about the window box being square because you can caulk the L frame if there are air leaks. The most important part of this installation is that you make sure it is plum so the magnets seal to the frame evenly all the way around the window.


Randy S.
 
Title: Re: Window
Post by: WebJunk on July 10, 2015, 03:52:07 PM
How well does that reduce sounds at various frequencies?
Thanks!
Title: Re: Window
Post by: Randy S on July 10, 2015, 04:02:39 PM
The thickness you should be using is 3/8" thick acrylic.
The value of reduction is really based off of the depth of the air gap.
The greater the gap the better the reduction like you see in recording studios or on commercial airplanes.
heavier the glass and greater the gap = best reduction
as you lose space or mass you get a lessor noise reduction.

All systems and materials have a different values at different frequencies, higher frequencies are always easier to reduce then lower frequencies.

Randy S.

 
Title: Re: Window
Post by: WebJunk on July 10, 2015, 05:12:35 PM
Have you had many use this? Have you heard from some of them? As you saw in my original post, I have 1" in the bottom section and just over 2" in the top. The acrylic sheets seem to be very expensive. Am getting the feeling this will not offer much of a reduction.
Title: Re: Window
Post by: Randy S on July 10, 2015, 05:38:45 PM
We have been using this system for well over 15 years with cost efficient results.
Your gap size will allow to achieve at least an STC 37 which is far better then what you have today.
Make sure your current window has no leaks.
I would call around to local plastic suppliers and get quotes prior to purchase of the magnaseal kit and you can make a decision.

Randy S.