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Old 07-20-2009, 02:34 PM   #1
 
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MASONRY-Weather Barrier behind natural rock indoors?


i'm getting ready to install some Robinson Rock natural rock inside my house around my fireplace. i replaced the drywall with a hardy backerboard type material. do i need to install a weather barrier between the backerboard and the metal lath? i've heard mixed reviews. i want to do this the right way so i'd love some feedback from the pros or anyone who has done this.
thanks in advance.
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Old 07-20-2009, 04:40 PM   #2
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I'm assuming Robinson Rock is a brand name of natural thin veneer stone, & if that is the case:

- No need for any barrier inside.
- Really no need to remove drywall, you could have just installed the galvanized lathe over it.
- If you already have the tile board up, you don't really need the galvanized lathe. Besides, it can be a real pain to fasten the lathe through the durock. Merely use a bonding agent in the mortar to adhere directly to durock.
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Old 07-20-2009, 04:40 PM   #3
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No need for a weather barrier. As I have suggested before in this forum, for an inside application of veneer stone I find it alot easier to set the stone on the cement backer board with thinset. No need for wire and a scratch coat.
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Old 07-20-2009, 04:41 PM   #4
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Good timing NJ
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Old 07-20-2009, 05:05 PM   #5
 
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alright guys, sounds good. i assume you guys haven't had any problems with your stone falling off in the long run then?
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Old 07-20-2009, 05:35 PM   #6
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I've never lost any stone long term (never after the first few houres) inside. On durock, you may get a few that don't want to stay in the first few minutes, but after that, they should be fine. Also, I will never lay NTV without a bonding agent in the mortar. A few ounces per batch makes a huge difference in the mud, or you could use the thinset that NJ could recomend. The major difference between laying NTV & cultured, at least in my experiances, is you HAVE to lay NTV from the bottom up BED joints in place right away, meaning no going back later to grout.

I will admit that I've lost stone long term on the exterior of a house once though. It was cultured stone directly over a poured foundation wall at a partially exposed basement. About 25 stones fell over the winter, & 25 more were questionable when we went to replace the stone. We had laid the stone directly over the wall with no prep & my guys were having a hard time getting them stay in the first place. I should have known better in the first place, but I'd rather know what it takes to make the stone job fail on a small scale so I can have a better understanding what makes the stone job last long term. Very cheap lesson learned. On a side note, we did lose another 25 or so stones on this same house shortly after we set them originally. The drywallers had showed up late morning & had started hanging drywall on an exterior wall with nails. Unfortunately, this was a big house, & this hanger was FAST with his hammer! By the time someone got to him to tell him to stop pounding, the damage was done. Again not a big deal, but by this point, we were ready to get the job wrapped up & move on.

Last edited by jomama45; 07-20-2009 at 05:37 PM.
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Old 07-20-2009, 05:39 PM   #7
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Quote:
Originally Posted by jomama45 View Post
Good timing NJ
must have just beat me to the punch
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Old 07-20-2009, 05:47 PM   #8
 
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thanks jomama. whats NTV and durock?
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Old 07-20-2009, 05:59 PM   #9
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NTV = Natural thin veneer, or any natural stone (real stone) sawed to approx. 1" thick. Cultured stone is actually a lightweight concrete poured into molds & colored to resemble stone. I've never seen the Robinson Rock, but heard of it & believe it is NTV, but I could be wrong. All of the NTV stone we've ever used comes from a local stone quarry who produces 95% of the NTV they sell.

Durock is just another brand name of tile board underlayment, much the same as Hardi backerboard.
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Old 07-20-2009, 06:05 PM   #10
 
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okay thanks. the robinson rock is a NTV.
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