Author Topic: How good is 2 lb spray foam for sound insulation?  (Read 5935 times)

MikeTw

  • Guest
How good is 2 lb spray foam for sound insulation?
« on: August 24, 2017, 11:52:40 PM »
Hi

How good is 2lb spray foam vs fibreglass vs roxul for sound insulation?

Looking more to deaden low freq vibrations...


Thanks

Randy S

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #1 on: August 29, 2017, 03:20:13 PM »
use roxul or therma fiber or even cotton fiber would be best bang for buck.

Randy S.

MikeTw

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #2 on: August 29, 2017, 11:36:06 PM »
Thanks.

Is roxul comfortboard a good option for outside?

Is there a big difference between the 80 vs 110?

Randy S

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #3 on: August 30, 2017, 03:56:27 PM »

what is your project for outside? kind of hard to make recommendations without all of the information.

Randy S.

MikeTw

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #4 on: August 30, 2017, 10:33:03 PM »
Outside.  Opening up existing 2x4 walls to hopefully staggered studs or double studs.


Randy S

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #5 on: August 30, 2017, 11:02:54 PM »
ok so not exposed directly to outside but in a wall...ok great ...

you can use standard Roxul batt insulation and double frame construction followed by lots and lots of mass.

The heavier the better for low frequency attenuation.

 Randy S.

MikeTw

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #6 on: August 30, 2017, 11:43:17 PM »
What do you suggest for mass?
the interior wall is behind kitchen cabinets so have to add outside.

Randy S

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #7 on: August 31, 2017, 05:30:01 PM »
#2 lb mass loaded vinyl or a couple layers of 1/2" permabond

Randy S.

MikeTw

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #8 on: September 02, 2017, 07:25:57 PM »
Sorry for my ignorance. 1/2" what?

Randy S

  • Guest
Re: How good is 2 lb spray foam for sound insulation?
« Reply #9 on: September 05, 2017, 03:13:10 PM »
Permabond is a type of cement board, you are trying to load as much mass as you can afford..the heavier the better.

Randy S.