Window treatment to dampen sound?

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Window treatment to dampen sound?

Postby SeekingSerenity » Tue Nov 08, 2011 11:19 pm

I'm thinking of making a window insert or cover to try and dampen some late night noise that is becoming more frequent in my neighborhood. Some of the noise is from the intentionally noisy car mufflers that are becoming more popular where I live (Seattle) and our neighborhood paper delivery person has one, some is noise from service vehicles at two business a block away (1 Gas Station, and 1 Restaurant that is becoming more popular), these are trucks deliver fuel, or taking away garbage, at very early hours (6am).

I've read about acoustic glass, but that I don't think I need that as I'm not trying to block all sound 24 hours a day, I just want to dampen or block sound during the night hours.

My windows are slightly inset, so there is room to build a snug fitting panel of some sort, and place them in clips that can hold them into place.

My questions are: has anybody here done this, and what materials did you use?

I was considering a light wood frame, with cork panels as the infill, then enclosing the entire panel in a wrap of heavy felt.

I've been doing some reading on the 'net and have seen people making large acoustic panels from rigid fiberglass and acoustic vinyl, but that might be more than I really need, and those materials might be more difficult to track down.

Has anybody had success with any other materials?

The biggest flaw I can see in my design, is that in the summer I like to have my windows open, so I'd need some other solution -- these panels will be useful only during the colder months... unless I can find a design that lets some airflow, but reduces sound flow.

Thanks in advance for your thoughts.
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Re: Window treatment to dampen sound?

Postby digitaldanny » Wed Nov 09, 2011 10:31 pm

The Solutions section on NoiseOFF covers materials such as insulating window treatments and interior windows:

http://www.noiseoff.org/solutions.php

There is a product called Eclipse Noise Reducing Curtains that claims to reduce noise levels, but I am dubious of its effectiveness. That said, if anyone has had any experiences with this product, I would love to know how they would rate it.

Interior windows, specifically designed to reduce noise (CitiQuiet, Citiproof) is ideal. The windows are highly effective at reducing ambient noise (such as roadway traffic) but not as effective as a nearby car alarm or noisy motorcycles. The windows require professional installation and are very expensive.

If you go the DIY route, it will require some experimentation. You could try using the heaviest thickest curtains you can find with a vinyl backing and then sewing two or three sets together to create layers. The downside is that it will block out all light and airflow. If you find a solution that works for you, please post it here as others can learn from it.
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Re: Window treatment to dampen sound?

Postby Jeanine » Sun Nov 13, 2011 12:15 am

I bought a pair of the noise reducing curtains for a single window, and found that they blocked out only a small amount of ambient sound that was not bothering me in the first place. They are described as reducing noise by up to 40%. Maybe they do, but it did not seem to be the noise I hoped they would reduce, which is remote keyless entry horn honking and friends and car service drivers who honk their horns when they are picking someone up. The curtains look great, though, and I think the claim that they save on heating and cooling costs is likely true.

Years ago, I lived in an apartment with only two windows facing the street. A man would pick up someone next door early in the morning and honk his horn, and when I asked him not to, he retaliated by honking more. I bought some sound blankets used on movie sets to block out street noise, and they worked very well. There was a window facing the back, so I was able to get some natural light. I don't know if sound blankets and moving blankets are the same. With my recent noise issue, I've thought of buying more sets of noise reducing curtains and some sound blankets, and use them together with the sound blanket in the middle. But I plan to move and do not want to invest hundreds of dollars when this might not work. I've also thought about wooden shutters as a possible solution, but again, I would not want to invest that in my current apartment.

Last year I stayed at a bed and breakfast located on a busy street in Baltimore, in a room facing the street. There was a lot of keyless entry horn honking along the block, and a bus line ran along the street, and I was concerned about noise. As it turned out, every room in the house had double pane windows, and there was low key white noise from central air conditioning, so I didn't hear any street noise during the night.

SeekingSerenity, please let us know what you wind up doing, and include pictures, especially if the inserts work.
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Re: Window treatment to dampen sound?

Postby coreym » Wed Dec 07, 2011 3:52 pm

I would say that the real kind are definitely more effective then the make shift kind. I did a little research, because I am also looking for something similar. I came up with this place that sells sound blankets. What is the quality of their blankets? Does anyone know the typical cost? Thanks.
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Re: Window treatment to dampen sound?

Postby Jeanine » Mon Dec 12, 2011 12:48 pm

I bought sound blankets at a film production supply store twenty years ago. All of the blankets I've seen online are more expensive than anything I bought years ago and I have no idea how well they work. If you are still doing research, it might be worth it to find out if the film industry still uses these, and where sound technicians buy them.
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Velvet? Um, no. Just no.

Postby ScaryBikerDude » Mon Apr 02, 2012 11:42 am

I'm going to set the record straight here.

There are three types of noise control materials, each with a different purpose.
1. Absorption - This is for echo reduction, is governed by the NRC rating, and relies on sound passing through it twice, firstly on incidence, secondly on reflection.
2. Isolation - This is designed for reducing the sound transmission between one area and another, and is governed by STC ratings.
3. Diffusion - This is designed for acoustic "tuning," and is wa-hay too complex to discuss here.

The materials designed for each are highly specialized for their intended purpose. Frequently, high-power absorption materials will do nothing to isolate noise.

What you want is to add a barrier of a different thickness and density than the window. Every material has what is called a "resonant frequency," which is a little like a color, only for sound. If you put two colored lenses, each with a different color, they will absorb more light than two lenses of the same color. The same principle applies to noise. Get a dense material (the denser the better... perhaps 1" sheet of gold!) that has a different resonant frequency than your glass.
The two factors that reduce the effectiveness of window treatments are insufficient mass and improper sealing.

STC ratings are calculated based on a complex "deficiency" schedule, in which even small leaks figure prominently. In your case, a secondary window with a polyvinylbutyl interlayer is probably worth considering. They can be opened and closed like regular windows. A 2 lb/sq. ft. barrier curtain panel could be hung from hooks during certain times of the day, too. Not sure about other manufacturers, but secondary windows from SPW have instructions for installing them yourself.

I can say one thing for certain, though. Acoustic infill panels, foam panels, and other absorption-purposed materials will do nothing for you. Nothing. Isolation takes mass. The right sound blankets for an isolation job have what's called a "barrier septum" of 1/8" thick barium-loaded vinyl sewn through the center.
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Re: Window treatment to dampen sound?

Postby ScaryBikerDude » Mon Apr 02, 2012 11:46 am

Also, if you're looking for airflow and isolation, it's tricky. The closest thing to doing that is an acoustical louver, which is basically a grating with absorption on the grates, which allows air through but not sound. However, getting these that actually work is a pain. There are about 8 manufacturers that actually do it correctly and actually use 3rd party testing. Good luck guessing which they are.
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Re: Window treatment to dampen sound?

Postby zeeshan » Tue Jan 22, 2013 6:46 am

There was a window facing the back, so I was able to get some natural light. I don't know if sound blankets and moving blankets are the same. With my recent noise issue, I've thought of buying more sets of noise reducing curtains and some sound blankets, and use them together with the sound blanket in the middle. But I plan to move and do not want to invest hundreds of dollars when this might not work.
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