Super Soundproofing Community Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Welcome to our forum specially upgraded for faster searching and a higher level of soundproofing information.


 Your question may have already been answered!
Use your KEYWORD in our search function before posting a query!
This forum is operated as a public service by the Super Soundproofing Co, whose experts are standing by to help you with any soundproofing situation.
 

Author Topic: Triple Leaf Effect?  (Read 3427 times)

shill2usa

  • Guest
Triple Leaf Effect?
« on: August 30, 2011, 05:32:53 PM »

I have installed the Magnaseal product for three windows where I have 1/4 laminated glass storm windows on the outside and original wood double hung windows with single panes in the middle and am wondering if I have created a triple leaf effect? For the magnaseal, I actually used 3/8 laminated glass (even though acrylic is recommended) and used mirror hooks to secure the glass to the metal framing as the magnets are not strong enough.
1/4 inch lami storm - outside
2 inch air space
single pane wood windows (probably 3/16 inch thick)
2 inch air space
3/8 laminated glass on magnseal framing
After installing the windows I thought I could tell a significant improvement at first however I'm not sure if there has actually been an improvement for low frequency (truck, motorcycle) noise as it appears I may have created a triple leaf effect with the three sheets of glass. Is that correct or is the design okay?
Thanks, Stephen

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 777
    • Super Soundproofing Co
Re: Triple Leaf Effect?
« Reply #1 on: August 30, 2011, 09:03:49 PM »

In theory, yes you could have created the dreaded triple leaf. The way to test if you have is simply open the middle window and see if there is a change in low frequency attenuation.
Let me know what happens...
Randy Sieg

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

shill2usa

  • Guest
Re: Triple Leaf Effect?
« Reply #2 on: August 30, 2011, 09:32:59 PM »

Thanks for the reply. I'll need to think about trying that as it will be kind of hard to test it as the middle (original) windows are painted/caulked shut. Also, the 3/8 interior lami magnseal windows have been caulked around fairly well too. I heard that since each pane of glass is a different thickness 1/4, 3/16 and 3/8 it may eliminate the potential for the triple leaf effect, although I'm not sure if that is true? Thoughts?

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 777
    • Super Soundproofing Co
Re: Triple Leaf Effect?
« Reply #3 on: August 30, 2011, 09:55:56 PM »

there is that potential. It would depend entirely on the frequency that is being expedited through the system, which normally are low frequencies. ie: traffic noise.
Randy Sieg

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

johnbergstromslc

  • Guest
Re: Triple Leaf Effect?
« Reply #4 on: September 04, 2011, 01:17:33 AM »

I agree with Randy.  Despite the disruption and extra work, you should remove the middle window and have as large an airspace as possible.  With good sealing, the airspace is what kills the noise.

jxrw47

  • Guest
Re: Triple Leaf Effect?
« Reply #5 on: December 09, 2011, 05:12:35 AM »

I am in the process of converting a room that is near a busy street and believe I may have created a triple leaf effect in trying to block the low frequency vehicle noise. I have searched this board in an attempt to find the answer to my question but have not been very successful. It seems that a triple leaf system  is always a bad thing for low frequencies and I am trying to confirm if that is still true when the leafs are of varying thicknesses.

1/4 laminated glass on exterior facing noise source
2 inch air space
1/8 inch single pane (100 year old window double hung window)
2 inch air gap
3/8 inch laminated glass (interior)

At first I just had the exterior laminated glass and the orginal window. I recently added the additional pane and although reduction at higher frequencies is noticeable I am wondering if I created a triple leaf effect and made the problem worse even though the middle pane is only 1/8 inch thick.

I would appreciate any insight anyone has.

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 777
    • Super Soundproofing Co
Re: Triple Leaf Effect?
« Reply #6 on: December 09, 2011, 05:22:23 PM »

Remove a pane and open the 100 year old double hung....then you should see an increase in low frequency attenuation.

When we do recording studios the air gap between the windows is what truly dictates the reduction...gap size can be 8" - 18" apart......

Randy Sieg

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