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Author Topic: Advice for larger window cavities  (Read 1752 times)

BradA

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Advice for larger window cavities
« 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"))

Randy S

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Re: Advice for larger window cavities
« Reply #1 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
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

BradA

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Re: Advice for larger window cavities
« Reply #2 on: April 20, 2018, 09:16:56 AM »

Thanks for your reply Randy, unfortunately I don't have a ledge to work with.



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?

Randy S

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Re: Advice for larger window cavities
« Reply #3 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.
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

laam10

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Re: Advice for larger window cavities
« Reply #4 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

Randy S

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Re: Advice for larger window cavities
« Reply #5 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.
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040