Super Soundproofing Community Forum

Soundproofing Forum Topics => Soundproofing Windows and Doors => Topic started by: BradA on April 19, 2018, 03:08:39 AM

Title: Advice for larger window cavities
Post by: BradA on April 19, 2018, 03:08:39 AM
I am looking into putting up some secondary glazing to help dull out neighbours and their dogs.  The windows I am looking at doing are around 2.2M x 1.2M (7.2ft x 4ft).  Now I see the ideal thickness of acrylic is 3/8 of an inch, using this thickness will be over 30KG (66lb) per sheet, will the magnet around all the edges be able to hold this weight or will I need to build a shelf to support it?

Also if it's only for neighbour/dogs will I get away with a thinner sheet or should I just go straight to 3/8"?  (the air gap will be roughly 105mm (4"))
Title: Re: Advice for larger window cavities
Post by: Randy S on April 19, 2018, 03:54:58 PM
The weight of the acrylic must rest on a sill or lip of the window box. The magnetic tape is to create the seal only (12lb pull).
Dogs barking and traffic noise I always recommend 3/8" and with your 4" air gap you will receive a very noticeable reduction.

Randy S.
760-752-3030
Title: Re: Advice for larger window cavities
Post by: BradA on April 20, 2018, 09:16:56 AM
Thanks for your reply Randy, unfortunately I don't have a ledge to work with.

(https://s18.postimg.cc/ospe15txl/image.png)

That image shows the bottom right corner of my window sill, all of them in the house are like this.  So I guess I either need build a shelf or recess the sheet which would lose some of that valuable air pocket space.  Any suggestions in your opinion on the best way to go about it?
Title: Re: Advice for larger window cavities
Post by: Randy S on April 20, 2018, 04:22:52 PM
That will work fine, recess the frame back enough so that the acrylic will rest on the sill.

shown here second diagram
http://www.soundproofing.org/infopages/magnetseal_windows.htm


Randy S.
Title: Re: Advice for larger window cavities
Post by: laam10 on August 08, 2018, 05:23:46 AM
Old thread, but I am doing a similar size (2.5mx1.7m in 10mm thick) (yes it was very heavy) I have it all installed and resting on a ledge but the magnet isnt strong enough to hold it to the wall, it is bowing slightly in the middle so we arent getting a complete seal. There is a noticeable reduction in noise even like this, but would be better with a total seal. Any tips to prevent this with large panels? I was thinking of clamping it on, but that would detract even further from the appearance.
Thanks
Title: Re: Advice for larger window cavities
Post by: Randy S on August 08, 2018, 03:45:25 PM
I have had this problem when dealing with larger windows and what I normally recommend are using mirror clips.
seen here.
https://www.homedepot.com/p/OOK-3-8-in-Offset-Clip-with-Hardware-8-Pack-50234/202341243


Best Regards,

Randy S.