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Author Topic: Dead airspace vs. laminated glass thickness impact on soundproofing window  (Read 3855 times)

warreo

  • Guest

Hi all -- I live in a studio apartment (low floor) that opens out to a busy main road and I am looking to get my one window soundproofed. For context, it is a large window (roughly 9' x 8') and definitely suffers from a lot of sound leakage. The apartment walls themselves (at least the exterior walls) are made of thick brick, so I'm fairly confident that if I soundproof the window my apartment would be significantly quieter. I am currently looking at soundproofwindows.com to do it (mixed reviews and high price notwithstanding...).

My main question is this: I have the option to use 1/4" laminated glass or 5/8" laminated glass. Obviously thicker glass is better, but due to the added weight and thickness of the 5/8" frame, the "dead air space" between my exterior window and the "soundproof" window would go from 3" (in the 1/4" scenario) to 2". soundproofwindows.com says there may be ways to preserve the 3" dead air space if using the 5/8" glass, but it would be at the cost of aesthetics (i.e. would protrude from the window sill area).

My questions to you experts out there are:
-Will there be any benefit to using the 5/8" glass if it comes at the cost of 1" of dead air space? I'm thinking it could in fact be worse.
-Even if I could maintain the 3" dead air space, does moving from 1/4" glass to 5/8" glass make that much of a difference in terms of soundproofing?

I know what soundproofwindows.com has told me, but I wanted to see what the unbiased expert take was.

Thanks!

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
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  • Posts: 819
    • Super Soundproofing Co

Mass and dead air space work together.. the more the mass doesnt mean huge reductions with out the air space...unless you are using lead lined glass.
In your situation you have to realize that the size of the window is the biggest problem, that is a huge speaker...if you can accept the aesthetics I would do the 5/8" with the larger air space.

If you can keep the 3" air space yes the increase in mass will give you a few more STC points.
In the end, the final value of reduction will be the window frame. To put it simple, the difference between mass and air space will be only a few STC either way you go....based on traffic noise there is no such thing as overkill.

Do they have a 3/8" glass option?

Randy S.

Randy Sieg

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

warreo

  • Guest

Unfortunately, no 3/8" option. It sounds like the reduction in air space would basically off-set any gains from the mass of the window, is that the right way to think about it? I'll have to consult the missus on the aesthetics part...I suspect that will be a sticking point. But it sounds like if I can't convince her, the way to go is just stick with the 1/4" windows with 3" air space.

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 819
    • Super Soundproofing Co

I would have to agree with that line of thinking due to the size of the window in of itself.

Randy S.
Randy Sieg

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

warreo

  • Guest

My thanks for the assistance Randy!