Author Topic: not sure if i'm creating a triple leaf or not  (Read 2484 times)

lazlo_m

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not sure if i'm creating a triple leaf or not
« on: December 24, 2014, 04:24:25 PM »
Hello --

I need to modify an existing wall in a garage I've converted into an office. It is letting in far too much environmental noise (airplanes, traffic, dogs barking... heck, even birds chirping!). Part of the problem is the door, which I plan to treat with a proper acoustical door seal and automatic door bottom, but I know I need to beef up the wall itself, as well. As you can see in this image, the existing wall is kind of a joke... just siding over lathe on 2x4 studs, then R13 insulation and then finished on the inside with 5/8" drywall, like so:



I spoke to a contractor who wanted to tear out the existing drywall, and then put a new, decoupled wall in front of the existing wall, like so:



He says he wants to remove the drywall because if he doesn't, we'll have triple leaf effect. In other words, he considers the extremely flimsy siding/lathe on the exterior of the building a leaf. But is it really? I'd really rather not tear out the existing drywall unless necessary (to cut down on cost and mess), but even more so because it's additional mass between me and the outside world. I only want to remove it if absolutely required, and I'm just not sure it is.

Thoughts on all of this?

Thanks!
L

Randy S

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Re: not sure if i'm creating a triple leaf or not
« Reply #1 on: January 03, 2015, 05:42:47 PM »
well your contractor is correct, if you do not remove the existing drywall and create the decoupled system,with out the triple leaf you can forget about getting bang for buck reductions especially in the traffic, planes and dogs issue.
Just remember if you do as the contractors telling you do the double wall system you can always add mass at a later date to increase the noise reduction value, and never have to back into the wall to improve the system.
Just make sure you seal everything like a fish tank!. even outlets and any switch boxes have to have putty pads on them.

Randy S.


Randy Sieg

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lazlo_m

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Re: not sure if i'm creating a triple leaf or not
« Reply #2 on: January 03, 2015, 08:07:04 PM »
Thanks Randy! Appreciate your input.