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Author Topic: Please Help -Sound proof a hollow window casement.  (Read 4682 times)


  • Guest
Please Help -Sound proof a hollow window casement.
« on: October 16, 2012, 09:11:50 AM »

Hi everyone, I really require some help. I am a foreigner living over in Kathmandu, Nepal.
Not many professionals over here (in any field) - especially in the business of sound proofing.

I am trying to sound proof an office and have arranged for a local window company to install the following:

1. Outside, 10mm Glass (windows open outwards)
2. 100mm Gap
3. Inside, 6mm Glass (Windows open inwards)

This seems to be the best solutions from my own research on the internet (I would have preferred 6mm with laminate glass, but its not available).
The noises are generally high pitch motorbike horns (arrgg), loud 'wooden flute' music (thanks Asia!) and the rumbling of trucks engines.

Anyway, the glass company has shown me the aluminum casement that will be used for the windows and it seems very thin, about 1.5mm thick - and there would be a hollow gap.
I'm wondering if this means installing thick windows will be a waste of time as the aluminum frame will be hollow and thin (picture attached) - or will the aluminum not be a source of the sound?

When I complained about the casement, they told me they would fill it with wood and ply board - but I just don't know if this will help or make matters worse?
I'm looking for other recommendations on what I could fill the hollow section of the aluminum casement with (Even if i had to import if its not so expensive), or whether they would be effective being left as is?
What thickness do the casements in normal sound proof windows have? is it similar to what I've shown?

Am I doing the right thing with my glass options and gap? How important are the seals they use, or the silicon etc.?

If anyone can give me some sage advice it would be greatly appreciated. Any!
Thanks so much in advance

Randy S

  • Guest
Re: Please Help -Sound proof a hollow window casement.
« Reply #1 on: October 16, 2012, 03:49:50 PM »

This will work, just make sure they fill and seal with caulking..This is critical.
Keep in mind you are working on single frame construction so you will only be able to reduce the noise so much...
Max air gap = better reduction.

Let us know how it turns out please.


  • Guest
Re: Please Help -Sound proof a hollow window casement.
« Reply #2 on: October 16, 2012, 04:00:09 PM »

Hi Randy,
Thanks for your reply.

Do you mean fill the hollow section of the casement by caulking? Or do I leave this section hollow? Any tips on what I fill it with?
Also, what do you mean by Single frame construction (apologies for my ignorance) , as I am installing what I thought to be two frames, one on the outside, one on the inside of the window sill?

Thanks again

Randy S

  • Guest
Re: Please Help -Sound proof a hollow window casement.
« Reply #3 on: October 16, 2012, 04:07:26 PM »

Fill hollow section with what they recommend and then seal it up. Mass plus caulk..

You are working on a single framed wall, It might be 2 windows but it is being installed in the same window box.