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Author Topic: replacing sash and glass only  (Read 4054 times)

mcjohn

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replacing sash and glass only
« on: December 17, 2015, 12:23:16 PM »

Hello All,

I came across this forum while searching for solutions for reducing the road noise in the house I recently purchased.  Great to be here and thanks for the great advice I've already read from others.

I'm having a berm built as close to the road as possible.  It's a two lane but has a lot of traffic, including large trucks.  I'm having a berm put in as close to the road as possible, and high enough that I won't be able to see the vehicles from my single story house.  The next item on the list is my windows.  They are 80's era Pella windows with wood frames and exterior aluminum cladding.  Given the frames are in great shape I'm wondering if replacing just the sash and glass with laminated glass will provide as much noise reduction as replacing the entire frame with modern windows that are built for noise reduction.

I had Pella come over and the STC rating for their new windows that are purpose built for noise reduction (they use double panes that have different thicknesses) are only rated at 32.  They also have a window built for hurricane prone areas made from laminated glass that have an STC rating of 34.  So now I'm wondering if I just replace the sash and glass myself, leaving the window frames in place will provide similar results and cost significantly less.

Thanks for any insight.

Randy S

  • Senior Soundproofing Technical Specialist
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Re: replacing sash and glass only
« Reply #1 on: December 17, 2015, 04:28:03 PM »

Addressing the window as you plan to will most likely only change value by a few points either way..

Look at the solution for best reduction as mass/gap/mass  this formula is what dictates performance.

example: look at commercial airliners ...ever look out the window?  3/8" safety glass / 2" dead air space / 3/8" safety glass....and your sitting 15-20 feet from the engine at take off...pretty quiet...

another example:  1/4" laminate glass / 1" gap / 1/4" laminate glass = STC 37
                             same glass       /  2" gap /  same glass          = STC 43
                             same glass      / 3" gap /   same glass           = STC 49


So you can see that the mass is important but so is the depth of the air gap...greater the gap the better the value...look at recording studio windows they could have 8" up to 18" separation.

So to answer your question, I would install a second window or a window insert with the greatest gap you can get.

Randy S.

Randy Sieg

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

mcjohn

  • Guest
Re: replacing sash and glass only
« Reply #2 on: December 17, 2015, 06:10:10 PM »

I'm having a hard time buying into the storm window type of solution.  They are just so ugly to me, plus if I ever want to open my windows I have to deal with removing that extra piece of glass.  If I can find a replacement sash/glass provider with something in the STC range of 35 to 40 I'm hoping that will do the trick.  I guess my question is this, even if the sash/glass is rated high will the window frame made of wood/aluminum cladding be an issue?

Randy S

  • Senior Soundproofing Technical Specialist
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  • Posts: 819
    • Super Soundproofing Co
Re: replacing sash and glass only
« Reply #3 on: December 17, 2015, 06:23:32 PM »

Yes it would be an issue...I have found that the best sound rated windows are vinyl windows...and the highest OITC values are from a company called Milgard quiet line.

But at the same time the the window will always be weaker than the walls until you do the double window system, So I guess it wouldn't matter at this point.

If your going to stay with a single window application just find the highest rated one you can find.

The problem with noise reduction and sound control is we all have our own perception of what the cost vs. reduction value would be. For me it is at least a 50% human perceived reduction or greater to justify cost.

If you would like to see some data on high performance windows send me an e-mail and I will reply with the information.

Randy S.

Randy@soundproofing.org
 
Randy Sieg

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

mcjohn

  • Guest
Re: replacing sash and glass only
« Reply #4 on: December 17, 2015, 06:57:13 PM »

It seems Milgard does not have any dealers in Georgia. 

Maybe it's easier to just sell the house and buy something not so close to a major street :)

mcjohn

  • Guest
Re: replacing sash and glass only
« Reply #5 on: December 17, 2015, 07:35:09 PM »

I found a company called Atrium, they have line called silent guard that has two series, 7000 and 9000.  They claim to have > 40 STC rating for the 7000 and > 32 STC rating for the 9000 series.  A local window installer has recommended them.  My only beef is the limited colors in the vinyl, it's either white or almond.  I'm not sure if I can paint the vinyl to get a match to the rest of the house.

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
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  • Posts: 819
    • Super Soundproofing Co
Re: replacing sash and glass only
« Reply #6 on: December 17, 2015, 08:57:47 PM »

Ok it took me a bit of research but I think I might have found an supplier for you.

Call me
760-752-3030
Randy Sieg

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

mcjohn

  • Guest
Re: replacing sash and glass only
« Reply #7 on: April 16, 2016, 02:36:10 AM »

Hey Randy,

I tried to call.  I'm not sure who the supplier was you found, but locally I've contacted Marvin and Weather Shield.  Did you find someone other than one of those two that you feel I should reach out to?

Thanks,
John