Author Topic: MLV in addition to green glue? Traffic noise  (Read 4497 times)

cinnacracker

  • Guest
MLV in addition to green glue? Traffic noise
« on: January 09, 2011, 04:56:56 PM »
Hi.  We live in a town house in Cleveland on a busy corner and obviously our issue is traffic noise.  We hear just regular cars driving by, poeple talking outside and of course sirens, buses and trains.   We have tons of windows and we are working on having custom "soundproof windows" installed (laminted glass with air gap).  But we know some of the sound is coming through the walls and we want to address that if its possible without too much destruction/ effort/ expense.

It seems the best option for us is to use the green glue another 5/8" drywall later and seal up all the joints with acoustical sealant method.  I hear great things about GG, but specifically for traffic noise, is it effective in this frequency range?  What about the addition of a layer of MLV?  Is it "worth it" for typical traffic noise?   

I appreciate any advice. 

Cinnacracker

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 790
    • Super Soundproofing Co
Re: MLV in addition to green glue? Traffic noise
« Reply #1 on: January 11, 2011, 08:56:24 PM »
yes it is worth it, there is no such thing as overkill in sound proofing.
By adding MLV you will increase your overall STC rating of the wall.
I have had better results with the combination of products over using green glue by itself.
Randy Sieg

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

BillyDee203

  • Guest
Re: MLV in addition to green glue? Traffic noise
« Reply #2 on: June 01, 2011, 09:53:45 PM »
Hope nobody minds if I add my question here instead of creating a new thread, especially since my situation is similar to the original poster.

The only difference in my situation is I stripped the walls of the original three-eights inch drywall and old cellulose insulation. I replaced the insulation with the recycled denim batts. Also, since the house is older the lumber is closer to true dimensional studs and not the smaller 2 x 4's commonly found in today's construction - and just to confirm, these are the exterior walls of the home, too).

Here's the problem. I don't have the room to spare for going with clips so I planned on going with two layers of 5/8" drywall separated by green glue. I had toyed with putting a layer of MLV before the first layer of sheetrock but I have read and heard various comments regarding "The Triple Leaf Effect" which would lessen the effectiveness of the effectiveness of the completed wall.

Will the MLV lower the effectiveness of the wall?

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 790
    • Super Soundproofing Co
Re: MLV in addition to green glue? Traffic noise
« Reply #3 on: June 01, 2011, 11:59:23 PM »
Glad you posted ;) 
To get to the main point, the MLV will NOT create the triple leaf effect. Triple leaf effect is by having 3 rigid surfaces in an assembly allowing specific frequencies to expedite through the system. MLV is installed in a limped format, look at it like a diaphragm that can move back and forth. The MLV will actually Increase the total STC value of your wall assembly.
Randy Sieg

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

BillyDee203

  • Guest
Re: MLV in addition to green glue? Traffic noise
« Reply #4 on: June 02, 2011, 01:20:30 PM »
Thank you for taking the time to answer. My walls have been bare with the exception of insulation and a vapor barrier for almost a year as I was trying to find the answer to this. Now all I have to do is get off my duff and get the time to complete this.

Thanks again for your assistance.

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 790
    • Super Soundproofing Co
Re: MLV in addition to green glue? Traffic noise
« Reply #5 on: June 02, 2011, 03:11:37 PM »
When your ready to do this project, call me direct so we can discuss the particulars of the job.
Materials are important, however the installation is the most important! if you install wrong the system will not work.


Randy S.
760-752-3030 ext 104
Randy Sieg

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