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Using 3/8" thin Gypsum board for fireplace wall?

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Using 3/8" thin Gypsum board for fireplace wall? mikedavid00 08-06-2006
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Posted by on August 6, 2006, 10:03 am
Hey all,

I have a wood fireplace in the corner of the living room with a wall
from floor to ceiling. The fireplace wall had this 1" or so thick brick
on it.. the wall looked like a backdrop to an 1980's stand-up comic
show.

I took down the wall and noticed that the builders used regular 1/2"
gypsum board and not fireboard/cementboard or anything like that.

I then read that all drywall is extrememly heat and fire resistent.

I would like put some new drywall up in it's place. I will be using
this wall as a backer for putting up some stone vaneer. It is
desireable for me to have the wall being very thin.

Is 3/8" Gypsum a good idea for this purpose? Any other thin
alternatives?

Thanks,


Posted by Harry K on August 6, 2006, 10:13 am

mikedavid00@HOTMAIL.COM wrote:
> Hey all,
>
> I have a wood fireplace in the corner of the living room with a wall
> from floor to ceiling. The fireplace wall had this 1" or so thick brick
> on it.. the wall looked like a backdrop to an 1980's stand-up comic
> show.
>
> I took down the wall and noticed that the builders used regular 1/2"
> gypsum board and not fireboard/cementboard or anything like that.
>
> I then read that all drywall is extrememly heat and fire resistent.
>
> I would like put some new drywall up in it's place. I will be using
> this wall as a backer for putting up some stone vaneer. It is
> desireable for me to have the wall being very thin.
>
> Is 3/8" Gypsum a good idea for this purpose? Any other thin
> alternatives?
>
> Thanks,

Gyp board is not "extremely heat...resistant". A fire wall requires
5/8" minimum thickness to get a reasonable delay before it burns
through (actually it just fails).

Don't use it as a backer for even artificial stone. The weight of the
stone is likely to tear the paper right off the sheet. Use concrete
backer board "Wonder Board" is one, comes 1/2" thick and mortar sticks
great to it. It also adds additional fire protection.

I can't think of anything reasonable thinner than that.

Harry K


Posted by dadiOH on August 6, 2006, 10:46 am
Harry K wrote:
> mikedavid00@HOTMAIL.COM wrote:
>> Hey all,
>>
>> I have a wood fireplace in the corner of the living room with a
>> wall from floor to ceiling. The fireplace wall had this 1" or so
>> thick brick on it.. the wall looked like a backdrop to an 1980's
>> stand-up comic show.
>>
>> I took down the wall and noticed that the builders used regular
>> 1/2" gypsum board and not fireboard/cementboard or anything like
>> that.
>>
>> I then read that all drywall is extrememly heat and fire resistent.
>>
>> I would like put some new drywall up in it's place. I will be using
>> this wall as a backer for putting up some stone vaneer. It is
>> desireable for me to have the wall being very thin.
>>
>> Is 3/8" Gypsum a good idea for this purpose? Any other thin
>> alternatives?
>>
>> Thanks,
>
> Gyp board is not "extremely heat...resistant". A fire wall requires
> 5/8" minimum thickness to get a reasonable delay before it burns
> through (actually it just fails).
>
> Don't use it as a backer for even artificial stone. The weight of
> the stone is likely to tear the paper right off the sheet. Use
> concrete backer board "Wonder Board" is one, comes 1/2" thick and
> mortar sticks great to it. It also adds additional fire protection.
>
> I can't think of anything reasonable thinner than that.

1/4" cement board?



--

dadiOH
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