Author Topic: SoundProofing my downstairs with a twist, NEED HELP PLEASE!  (Read 2521 times)

sellersaf

  • Guest
SoundProofing my downstairs with a twist, NEED HELP PLEASE!
« on: January 21, 2014, 05:49:52 PM »
Hello, i have a two story ranch, where on one side of the downstairs, has a 'finished' apartment unit that we rent out. Unfortunately, it is right below all the bedrooms and hallways where there is heavy foot traffic and the noise is very bad. After doing research, i was going to go the common route of insulating in between the joists, installing a resilient channel; and then sheetrock.

 I have one major problem, however. A giant steel I-beam running through the middle of the ceiling. The builder of the house was smart enough to lay two huge steel I-beams on the foundation and ran them the length of the house, which allows everything to be open, both up and downstairs. So, this beam runs through the middle of the downstairs area where i would like to soundproof. Here is a make shift diagram:

_________________
l          I  I                   l
l          I  I                   l
l          I  I                   l
l_____I_I________  l

So, my main question is this. How, if at all, can i install a resilient channel with the presence of the beam? Currently there is a drop ceiling which was installed JUST below the I beam. I have took several pictures and will include them. If you need any other information, or better pictures, let me know and i will update ASAP. Thank you for any and all feedback.

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 802
    • Super Soundproofing Co
Re: SoundProofing my downstairs with a twist, NEED HELP PLEASE!
« Reply #1 on: January 21, 2014, 07:15:53 PM »
you will need to soffit the I-beam, run 2x4's down around the I-beam as the structural support for your channel to mount to then mount the drywall to the channel as planned.

here is an article to read.
http://www.diy-home-theater-design.com/soffit.html
Randy Sieg

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

sellersaf

  • Guest
Re: SoundProofing my downstairs with a twist, NEED HELP PLEASE!
« Reply #2 on: January 21, 2014, 07:36:53 PM »
Thank you very much Randy. My initial assumption was that the beam would need to be boxed if this were to happen. So will simply capping/boxing my beam make it soundproof? Won't the noise then bypass any channel i have installed, and filter out through the Beam? Would you recommend wrapping the beam in soundproofing material before capping it (IE vinyl, insulation, etc)? If thats the case, i can then mount my resilient channel to the top of the beam, and essentially have two floating sheetrocked ceilings on both sides of the beam?

Another issue to address. Ive come across a few posts/articles that are saying soundproofing JUST the ceiling wont help much, and that the sound will assuredly flank to the walls instead. Do you subscribe to this theory?  Soundproofing the walls really isnt an option for me, so the ceiling is really all i have to work with. Thanks again for the help.

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
  • *****
  • Posts: 802
    • Super Soundproofing Co
Re: SoundProofing my downstairs with a twist, NEED HELP PLEASE!
« Reply #3 on: January 21, 2014, 07:50:40 PM »
If you are going to use Mass loaded vinyl (which would improve the reduction) you have to do the entire ceiling that your soundproofing..just wrapping the I-beam or doing partial ceiling will most likely show little to no value.

You want to mount the soffit support to the subfloor not touching the I-beam and then mount your channel to the 2x4's this allows the decoupled system to function correctly.
Yes, you will always have a value of flanking problem when your soundproofing from the receiving side or not addressing all 6 sides of the cube...what value of flank you end up with is unknown until the project is completed.

Just soundproofing a single partition or ceiling will give you a value of reduction, the real question is what reduction you achieve at what cost.. Impact noise is just as difficult as heavy low bass and therefore 50% human perceived reductions would be considered good.
 
Make sure that you leave the 1/4" gap around the perimeter of the ceiling to be filled in with acoustical caulk and do not use screws long enough the go through the drywall and past the channel depth risking a short in the system.
No canned/ recessed lights....
Randy Sieg

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

 

anything