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Author Topic: plexiglass vs plate glass for interior windows  (Read 13384 times)

llvora

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plexiglass vs plate glass for interior windows
« on: December 27, 2011, 08:24:48 PM »

Is plexiglass or plate glass better for soundproofing, as an interior window?  I might use 1/4” plate glass, say, vs. 1/2” acrylic.  It would be a non-openable window. 
The plate glass is a lot heavier.  It's mostly traffic noise that I'm trying to keep out.  I know weight helps to keep out low-frequency sound. 

Randy S

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Re: plexiglass vs plate glass for interior windows
« Reply #1 on: December 28, 2011, 03:33:42 AM »

Only if it will be a permanent window do I promote laminate glass...if removable or magnetic it should be acrylic for safety and cost of breakage...
1/4" is minimum thickness and 3/8" is max which is the diminishing point of return...so 1/2" is not a good investment unless the window size is greater than 24 sqft. or air gap can exceed 8" with double frame decoupled wall assembly.

In the end the dead air space and condition of original window seals will dictate the reduction...plus the value of the exterior wall including the actual window box itself.
So 1/4" plate is fine, just address condensation with silica or vacuum seal. Remember no such thing as 100% soundproof and when you treat windows you will get a reduction for sure however, you will find the next "leak in the bubble" so to speak. Area of least resistance..or you will equal out based on frequency.


Randy Sieg

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llvora

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Re: plexiglass vs plate glass for interior windows
« Reply #2 on: December 28, 2011, 11:24:17 AM »

Only if it will be a permanent window do I promote laminate glass...if removable or magnetic it should be acrylic for safety and cost of breakage...
There isn't a particular reason to make the interior windows easily removable.  Eventually perhaps the space inside would need to be cleaned, but that's all. 
Glass has the advantage that it's a more durable surface.
I was wondering about acrylic because I saw something on this website a long time ago about acrylic having a "floppiness" that absorbs sound energy.  Perhaps it would have lower resonant frequencies than glass, being less rigid.  Would that sort of thing make a difference?
Quote
In the end the dead air space and condition of original window seals will dictate the reduction.
So sealing the original windows, which are openable, with silicone would be a good idea, it sounds like. 
Quote
So 1/4" plate is fine, just address condensation with silica or vacuum seal.
Is there an easy way to make a vacuum seal?
thanks
Laura

Randy S

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Re: plexiglass vs plate glass for interior windows
« Reply #3 on: December 28, 2011, 03:16:40 PM »

The main reason to make it removable is to open the window.
Quote
I was wondering about acrylic because I saw something on this website a long time ago about acrylic having a "floppiness" that absorbs sound energy.  Perhaps it would have lower resonant frequencies than glass, being less rigid.  Would that sort of thing make a difference?
this is really based on 2 things, dropping the panel if accessing the main window and the size of the window...the bigger the window the worse the reverberation so acrylic will have an advantage but for residential homes this would not be a noticeable difference due to the max potential air gap and wall STC value...

vacuum seal is done by professional glass companies if possible on your specific window system....the DIY method is just using silica packs.
Randy Sieg

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

llvora

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Re: plexiglass vs plate glass for interior windows
« Reply #4 on: December 28, 2011, 05:13:12 PM »

the DIY method is just using silica packs.

I tried sticking silica packs into the space between the windows and the storm windows.  Just packs I'd saved from vitamin bottles etc.  That didn't prevent condensation.  How does one do this so it works?
I think what I'll do is to nail in a rectangular frame made out of 1/4" trim for the interior window to rest on, then silicone to seal it, and 4 little blocks around the edges to hold it in place.  That would be easy to undo if necessary if one ever wanted to clean it or open the window.  But easier than a magnetic casually removable interior window.
thanks
Laura
by the way there are green ripe apples :)

Randy S

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Re: plexiglass vs plate glass for interior windows
« Reply #5 on: December 28, 2011, 05:28:19 PM »

There is a formula for amount of silica vs. cu in. coverage area. most likely you didn't have enough.
Here is a link to a company that can help you with this.
http://www.silicagelpackets.com/


your idea of installation is ok as long as you get an air tight seal from glass to new frame and frame to actual window box...2 seals that you must achieve.

:) fyi, that is how we avert spammers/bots
Randy Sieg

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

johnbergstromslc

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Re: plexiglass vs plate glass for interior windows
« Reply #6 on: December 28, 2011, 05:39:57 PM »

I tried sticking silica packs into the space between the windows and the storm windows.  Just packs I'd saved from vitamin bottles etc.  That didn't prevent condensation.  How does one do this so it works?

Unless your silica gel packs were stored in an airtight container, they absorbed moisture from the air and were saturated long ago...

In theory, you can 'refresh' the packs by putting them in an oven for 30 minutes at 350 degrees, but you risk setting them on fire...

llvora

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Re: plexiglass vs plate glass for interior windows
« Reply #7 on: December 28, 2011, 05:51:21 PM »

fyi, that is how we avert spammers/bots

I know, but some of the questions are obscure, like "we ask these questions to avoid SPAM"  I tried a lot of different answers to that one, finally mercifully the question changed. 

thanks much,
Laura

Randy S

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Re: plexiglass vs plate glass for interior windows
« Reply #8 on: December 28, 2011, 06:03:46 PM »

Your welcome, we'll have to work on that one..
Happy Holidays  ;D
Randy Sieg

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

whatismisophonia

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Re: plexiglass vs plate glass for interior windows
« Reply #9 on: January 26, 2012, 04:47:36 AM »

yeah that question really got to me; i typed in "wtf" and it didnt work.  so then i typed in red, and it did.  But im still like, wtf is this? there are red, green, yellow... im sure there are better questions to ask to avert spammers that dont make people feel stupid. Any who, I plugged one window and attached a 1/8" arylic pane to the interior side of the house of the south facing window (we are up in the north).  It did help, but not entirely; im looking into doubleing the glass panes on the outside window, or replacing them with thicker panes.  By the way, does anyone know of a way to laminate window panes in a way that will last at least awhial?  I dont happen to have any pvp nor the facilities to do such lamiations.  And dont tell me to buy a window; IVE CONSIDERED THAT.  of course id buy expensive stuff if i had the money.

whatismisophonia

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Re: plexiglass vs plate glass for interior windows
« Reply #10 on: January 26, 2012, 04:50:13 AM »

I "plugged" one window; the east facing window, and installed this stuff called "optiplex" on the south facing one.  Just clarifying.

whatismisophonia

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Re: plexiglass vs plate glass for interior windows
« Reply #11 on: January 26, 2012, 04:53:29 AM »

wtf.   is this thing not recognising the letter "U" as in underware?  i type plugged, but its writing plegged