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Furring Out Wall On Top Of Drywall

 
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Old 10-26-2010, 08:42 AM   #1
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Furring Out Wall On Top Of Drywall


This is anew one for me personally.

Customer is requesting me to fur out there exterior 2x4 wall another 4" or so. They want it flush with the footing in the garage.

The existing wall is insulated with batts, kraft faced and drywalled. I would basically be putting another 2x4 wall in front. Customer wants me to insulate the new wall.

I know that the kraft face acts as a vapor barrier and you are not supposed to put more insulation on top of it but with the sheetrock there, does that rule still apply?

If I build the wall and insulate it, will I be creating an issue?
Condensation?
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Old 10-26-2010, 03:55 PM   #2
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Re: Furring Out Wall On Top Of Drywall


why not take out the insulation and instal an R19 or R25?

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Old 10-26-2010, 04:22 PM   #3
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Re: Furring Out Wall On Top Of Drywall


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Originally Posted by vos View Post
why not take out the insulation and instal an R19 or R25?
He's trying to avoid removing the sheetrock, I would guess. Is the garage climate controlled? If it's not heated, what kind of condensation problems could there really be anyway?
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Old 10-26-2010, 04:47 PM   #4
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Re: Furring Out Wall On Top Of Drywall


I think the fact that there is sheetrock already there is going to be more of an issue than the fact that it has kraft faced insulation. It is my understanding that the "ideal" place for a moisture barrier is in the center of insulated wall. That being said, it's jut not practical in normal circumstances. Why do they feel they need to insulate the new wall? If thats not important I would think you should be ok to build ovder it.
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Old 10-27-2010, 06:34 AM   #5
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Re: Furring Out Wall On Top Of Drywall


Spoke with the owner last night about my concerns,

He does not want to remove the insulation or sheetrock as he thinks it will help with insulating the garage.
He wants to insulate the new wall because in his mind he will be " doubling the r-value of the wall".

He did mention that in the future he wants to add radiant heat as this is where he will be keeping his baby.

I main concern is that the area between the new wall and the old sheetrock will become a moisture trap and there maybe condensation issues or worse mold in the future, especially when he adds the heat!

I told him, I'd probably just build the new wall but leave the insulation out but he really wants the added r-value
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Old 10-27-2010, 08:07 AM   #6
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Re: Furring Out Wall On Top Of Drywall


Your concerns are correct about the current and new walls, drywall and paper vapor barrier.

Use Dow styrofoam 2" in the new frame wall cavity. No addl vapor barrier. Must have drywall.

Last edited by We Fix Houses; 10-27-2010 at 08:32 AM.
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Old 10-27-2010, 03:28 PM   #7
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Re: Furring Out Wall On Top Of Drywall


Quote:
Originally Posted by We Fix Houses View Post
Your concerns are correct about the current and new walls, drywall and paper vapor barrier.

Use Dow styrofoam 2" in the new frame wall cavity. No addl vapor barrier. Must have drywall.
Thanks!

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