Author Topic: Can batting (insulation) actually be bad?  (Read 1604 times)

Luke6

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Can batting (insulation) actually be bad?
« on: July 17, 2019, 04:01:08 PM »
Hi, I've read that batting is pretty useless when it comes to soundproofing, contrary to popular belief. Seems decoupling and mass account for about 90%.
So here's my question: in a double stud wall, could batting actually be bad in that it creates a material bridge across which flangeing can take place?
If batting is useful, why exactly and how must it be used in such a wall assembly (decoupled double-stud wall with drywall boards either side) to be effective?

Thanks a lot. I look forward to getting some feedback on this.

Randy S

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Re: Can batting (insulation) actually be bad?
« Reply #1 on: July 17, 2019, 05:55:06 PM »
Great question.

Decoupling and Mass are absolutely primary principles in an assembly but absorption and dampening do add additional value in their own way depending on the goal.

Insulation in the cavity is a must as it helps to absorb sound waves that would bounce around in the cavity and create a resonance chambers which helps airborne sound easily pass through the assembly.

Batting can not create a coupling effect from frame to frame as it is not rigid enough to pass vibration easily like wood or metal.

Randy S.
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Randy Sieg

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Luke6

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Re: Can batting (insulation) actually be bad?
« Reply #2 on: July 18, 2019, 09:31:10 AM »
Hi Randy, thanks for the clear and clearly well-informed reply. Got it!

I'm about to post another question about the possible superior merits of a staggered-stud wall with a split sill, compared to a double-stud wall. I hope to hear from you on this too.

Thanks!

 

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