Cultured stone attachment around a woodstove

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Builder Bob

Member
Feb 27, 2007
42
Joelton, TN
Can construction adhesive be used behind cultured stone on dura-rock near a woodstove? I was talking with a mason and he said that they sometimes used const. adhesive on the stones instead of buttering the back and sticking them to the scratch coat. Wouldn't the heat from a stove be bad for the adhesive? Off gasing, or potential fire hazzard? I know it is not as flamable when dry but I would think it would still be a no-no, not to mention I have not seen this by the mfg companies.
 

begreen

Mooderator
Staff member
Nov 18, 2005
96,414
South Puget Sound, WA
Sounds like a corner cutting technique. Literature that I have read about cultured stone installation use mortar. I think you are correct, I'd do it the traditional way with mortar and not with construction adhesive.
 
When I built my hearth, I was told to use only non-mastic mortar because of the heat so I would definitely not use anything like liquid nails. Also, wouldn't the heat soften and deactivate adhesive?
 

fossil

Accidental Moderator
Sep 30, 2007
10,568
Bend, OR
Get yourself a couple of tubes of that stuff NASA uses for the space shuttle tiles...can't be all that expensive. :cheese: Rick
 

Jags

Moderate Moderator
Staff member
Aug 2, 2006
18,400
Northern IL
Construction Adhesive should NOT be used with cultured stone. Mortar is the king. Not only that, but think of how the joints and spaces between the rock are going to look if not filled with mortar.

I'm not sure, but I also would suspect that construction adhesive would not be considered a "non-combustible" . Just a thought.
 

fossil

Accidental Moderator
Sep 30, 2007
10,568
Bend, OR
FWIW, I just spoke with a friend who's a master brick & stone mason. He's done a lot of work for me, and these days does more stone than brick. Built a good many hearths, fireplaces, mantles and such. Says he doesn't even carry construction adhesive of any kind to the jobsite. Rick
 

Builder Bob

Member
Feb 27, 2007
42
Joelton, TN
Thanks for the replies, this is kind of what I was expecting. I was not comfortable thinking about my woodstove humming along then start smelling the glue or worse yet get too hot and potentially go up in smoke.

Rick, I will check on the NASA high temp adhesive and try to find out how much for a tube! :p
 

Highbeam

Minister of Fire
Dec 28, 2006
20,013
Mt. Rainier Foothills, WA
In addition to stink and combustion I would worry about the dang stones falling off and landing on your head, the stove, or the tile work of the hearth. You could certainly make it look good with mortar applied as grout after gluing them up.
 

jtp10181

Minister of Fire
Feb 26, 2007
3,734
Marshall, WI
Construction Adhesive can out-gas at high temps, definitely stay away.
 

northcountry

New Member
Apr 12, 2007
22
Maryland near PA
I have cultured stone behind my freestanding stove, from the hearth all the way up to the top of the cathedral ceiling - about 12 ft.
It is attached directly to durock with type 'S' mortar (no mesh) and it has given no problems for 2 years now.

The stone is a dry-stack style, so no mortar goes between the joints.
The durock is laid sideways, making a 5 ft wide backing, set out one inch from the wall with spacers. Using corner pieces at the edges it looks like a stone wall integrated with the house.
You want to do it right the first time, cuz putting that stuff up is quite a chore!
 

Builder Bob

Member
Feb 27, 2007
42
Joelton, TN
The surface will be durarock on 3-5/8" metal studs around the stove and the sloped ceiling above the stove. I plan on using a ledge/drystack stone when I do install it.
 
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