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Author Topic: Choosing glass type/thickness for sliding door to block street sound.  (Read 2372 times)

logni

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For a sliding glass door, which of these glass options will block street noise the best (specifically, the engine noise of cars accelerating away from a stop sign about 50 feet away)?



glass1, glass2        - STC, EWR, OITC
1/8 1/8               - 29 29 22
1/8 1/4               - 33 34 28
3/16 3/16             - 33 34 24
1/4 3/16              - 33 34 28
1/8 3/16              - 33 34 27
3/16 7/32 LAM         - 34 35 29
1/8 7/32 LAM          - 35 35 28
7/32 LAM 7/32 LAM     - 35 36 29


The last option has the highest rating of the 3 measurements. Other than cost, is there any reason not to choose it if the ratings are correct?

These are Milgard's numbers for their Tuscany series sliding door--do these seem reasonable?

Thanks in advance.

Randy S

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Re: Choosing glass type/thickness for sliding door to block street sound.
« Reply #1 on: November 29, 2016, 04:46:23 PM »

Milgard tuscany series are actually good quality sliders for noise control and are one of the very few companies we recommend.

Any of the last 3 choices with laminate glass are best performers.

The only way to get higher performance is to install double sliders back to back with an air space between them.

Randy S.
Randy Sieg

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logni

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Re: Choosing glass type/thickness for sliding door to block street sound.
« Reply #2 on: November 29, 2016, 09:40:22 PM »

Thanks Randy.

To follow up, I currently have the "1/8 -- 1/8" option already installed. I'm told it may be possible to replace just a single pane, rather than both panes, which would reduce the cost. If so, is there a preference for whether the "7/32 LAM" pane is the inside, or outside one, in terms of blocking the engine noise of the accelerating cars? I'm also unfamiliar with window pane compatibility. Will any 7/32 laminated glass pane replacement work, or does it need to come from Milgard? Would a thicker laminated pane (not from Milgard) be even more effective?

Would there be gains in keeping the old 1/8 pane around and sticking it on top of the door (so there are 3 panes)? Outside of the sliding glass door there is a balcony with open railings. Would mounting the old 1/8 glass pane to block sound going through the balcony railings yield any gains? The top half of the balcony would be completely open still.

Randy S

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Re: Choosing glass type/thickness for sliding door to block street sound.
« Reply #3 on: November 29, 2016, 09:56:28 PM »

that is a tough question there,,, even if you went with the 7/32 lam on the inside how much more noticeable reduction would you see?....Remember STC is the average reduction over a range of frequencies...you are trying to reduce low frequency which means you might only see an additional 2-3 db drop after the fact....!!!!

Good questions!

Here is where I will have to stand on this one, If you could increase the air gap when replacing the pane then I could see a more cost effective value of reduction. Just changing the pane by 3/32nd's would not be enough for me to sign off on the cost vs. reduction. Too risky in my opinion.

Would you be willing to entertain the double slider idea?

Just a quick example 1/4" lam / 1" air space / 1/4" lam = STC 37
                               "    "   / 2" air space /  "     "    = STC 43
                               "    "   / 3" air space /  "     "    = STC 49

So as you can see the air gap is more of a guarantee of increased reduction. This is why Milgard quietline and tuscany have a larger air space then most all window manufacturers.  Look at the slider and all windows like speakers, hard around the perimeter and lose in the middle. bigger the window/slider the bigger the speaker.

The balcony idea is good, plexiglass might be a better option there (3/8" thick)

Tough one Logni.

Randy S.
Randy Sieg

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

logni

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Re: Choosing glass type/thickness for sliding door to block street sound.
« Reply #4 on: December 01, 2016, 08:22:41 PM »

Update:

It turns out both inner and outer panes, on both door panels, would need to be replaced together. $1200 material cost (1/8" - 7/32" LAM), $300 labor. I would then diy mount the current two glass panels on the lower half of the balcony (how effective would this be?)

Another option is add 1/4" acrylic sheet on the door ($400 material), and/or 1/4" acrylic sheet on the lower half of the balcony (also $400 material).

Adding a second slider would be on the inside I suppose? And it would protrude from the wall instead of being flush. But this need not be as expensive of a door so it could be comparable in cost to changing the glass?

logni

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Re: Choosing glass type/thickness for sliding door to block street sound.
« Reply #5 on: December 02, 2016, 06:53:47 PM »

It looks like a standard dual pane sliding glass door from Home Depot or Lowes is around $400. Having it installed would take up some interior space, but probably be more effective than switching to laminated glass. I will look into the labor cost of having this done, but it seems like this is a non-standard install most installers aren't familiar with.

Are there any references for how to do this installation?

Randy S

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Re: Choosing glass type/thickness for sliding door to block street sound.
« Reply #6 on: December 02, 2016, 07:11:25 PM »

Yes the contractor would build a new 2x6 frame with header on the inside of the house.
Drywall or vinyl to cover outside edges the frame work.
Install second slider with max gap and finish frame facing accordingly with vinyl or molding.
Make sure that you seal between RO ( rough opening)  and slider casing with either caulking or closed cell foam.

Randy S.
Randy Sieg

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