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Author Topic: STC of foam plugs for windows  (Read 6278 times)

tedcal

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STC of foam plugs for windows
« on: March 21, 2011, 02:08:38 AM »

I'm considering stuffing the foam mat inside the window opening.  What's the STC for SSP 1" foam?  1.5"?  2"?

Randy S

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Re: STC of foam plugs for windows
« Reply #1 on: March 21, 2011, 04:41:20 PM »

 1" / 1 1/2" / 2" SSP foam mat is 25 STC. Normally for window plugs we recommend 1 1/2" or 2". The key will be the compression seal to the window box. If you have room for an air gap this will also increase you overall STC value.
Randy Sieg

Super Soundproofing Co
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Fax.760-752-3040

tedcal

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Re: STC of foam plugs for windows
« Reply #2 on: March 21, 2011, 08:41:45 PM »

If all 3 of those thicknesses are STC 25, then what would be the benefit of the thicker foam? 

Using 1.5" foam I'd have a 1.5" air gap.  If my window were STC 29, would I simply add 25 to it to arrive at the final STC value?

Randy S

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Re: STC of foam plugs for windows
« Reply #3 on: March 21, 2011, 10:48:16 PM »

We do notice a greater sound reduction in the field when you use the thicker foam, but the lab test data provided does not show a difference. Air gap is important so splitting the difference is a good idea.

As for calculating total STC it can not be done that way it is fractional not compounded results.
The air gap and window size are variables in the equation.
Randy Sieg

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

johnbergstromslc

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Re: STC of foam plugs for windows
« Reply #4 on: March 22, 2011, 07:04:40 PM »

Using 1.5" foam I'd have a 1.5" air gap.  If my window were STC 29, would I simply add 25 to it to arrive at the final STC value?


[/quote]

Assuming you could get good sealing, I'd estimate your final STC value would be 34-35.

By way of example, a single piece of 1/2" drywall rates an STC of 26 but 2 pieces with an airspace does not total STC 52 - more like 33 in a regular stud wall.

tedcal

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Re: STC of foam plugs for windows
« Reply #5 on: March 22, 2011, 10:31:26 PM »

Using 1.5" foam I'd have a 1.5" air gap.  If my window were STC 29, would I simply add 25 to it to arrive at the final STC value?

Assuming you could get good sealing, I'd estimate your final STC value would be 34-35.


The website says that foam plugs reduce window noise by 90% so I was expecting an STC of 45+.  Going from 29 to 35 is only a slight reduction in sound. I have sat inside homes with 35-STC-rated windows and there isn't that huge a difference from my windows.

How does the plug compare to 1/4" acrylic sheets with magnets?

johnbergstromslc

  • Guest
Re: STC of foam plugs for windows
« Reply #6 on: March 23, 2011, 04:27:55 PM »

Well a 90% reduction in sound energy is equivalent to 10 dB.  If you're talking about perceived noise, you'd need a 30 dB reduction.

You mentioned that if you used 1.5" foam you would have a 1.5" airspace.  Better to use thick plexiglass or some type of acrylic panel with a 3" airspace.  It's the airspace that kills the noise.  But you also need good sealing.

(Also, you won't lose your view, or light) 

With this configuration you might get an STC in the low 40's...