Mortar on Drywall
Posted By Don Czarniewski on 1/30/2001 at 3:33 PM

Looking for some suggestions and experience here. I've got some stone work to do this week on a firepalce. About 6" of stone is going to go over drywall. Should I do anything to the drywall before letting the mortar hit it? The stone is big enough that there will be no structural component to this overlap. Currently the drywall is covered with a high quality acrylic primer. Thanks, Don C.



Re: Mortar on Drywall
Posted By Phillip Bender on 1/30/2001 at 6:30 PM

Don,
You are going to stick stone directly to drywall? Is this real stone or some of the man made stuff?
Phil



Re: Mortar on Drywall
Posted By Don Czarniewski on 1/30/2001 at 6:33 PM

Phil,

This stone will be some of the man made. The drywall will be doing nothing to hold the stone up or on. The mortar is going on strickly as a backer and filler. Don C.



Re: Mortar on Drywall
Posted By Phillip Bender on 1/30/2001 at 7:26 PM

Don,
The man made stuff (there it is again, I can't remember the name of the manufacturer) is not really stacked like real stone it is stuck to the wall like a veneer. I have always seen wire lath installed over the board, this scratched and the stone stuck to that. When I have done it we buttered each piece and stuck it on, but it depends on the stone. Stacked thin stone and squarish stone is best installed the way I mentioned but with rounder more irregular stones you can lay a fat coat of mud on the bare wire lath and jam the stones into the mud. Rake out the joints with a little stick after it takes up. Are we on the same page here or have I totally missed the mark?
Phil



Re: Mortar on Drywall
Posted By Frank Witt on 1/30/2001 at 7:43 PM

Don
I have that culture stone on the outside corners of my house, I used the Durarock cement board as my backer then I used a product called CSC-4 it's for panel brick, you can pick it up at cornellie, I didn't have to use wire, if you use the durarock and CSC-4 they bond together, If you want to see some pictures send your e mail to me and I'll show you what I did,
Frank



Re: Mortar on Drywall
Posted By Phillip Bender on 1/30/2001 at 7:44 PM

Don,
I may be way off base here. Who makes this stuff? If you are going to stack it like real stone, I would think that you wouldn't have to do anything to the dry wall except nail on some ties here and there, like the rock masons use. I think in this case I would put some bonding agent on the drywall. It may not do anything structurally but a little bond there wouldn't hurt. When the rock masons do it they like to see some bond to the wall, but then again, not always. I'm not much help am I.
Phil



Re: Mortar on Drywall
Posted By Don Czarniewski on 1/30/2001 at 7:45 PM

Phil,

Were on the same page. The stone manufacturer is "Cultured Stone" out of CA. I asked about the lath, but was told I did not need it in this situation. I am putting it up over clay brick, and for that, no wire lath. It's also a rather minimal space getting covered. 10" on the sides, and undetermined for the top as of yet, but should be approx 20 to 22". Put gray slate down as a hearth, and the orange brick didn't get it. I knew we'd be doing this once the customer saw the contrast. Don C.



Re: Mortar on Drywall
Posted By Phillip Bender on 1/30/2001 at 7:45 PM

Don,
Listen to Frank.
Phil



Re: Mortar on Drywall
Posted By Don Czarniewski on 1/30/2001 at 7:47 PM

Frank,

Good to hear from you. Where ya been? Vacation I hope, and things have been well! Please do email the pics. Don C.



Re: Mortar on Drywall
Posted By Don Czarniewski on 1/30/2001 at 7:49 PM

Phil,

You've been plenty of help. Never though of the wall ties. Don C.



Re: Mortar on Drywall
Posted By Phillip Bender on 1/30/2001 at 7:49 PM

Don,
I'm back again, I know this stuff, you don't need lath it will stick to the brick no sweat. Might be a good idea to scratch it though, just lightly. It shouldn't hurt the drywall, you could mask it off if you want to avoil mortar stains.
Phil



Re: Mortar on Drywall
Posted By Don Czarniewski on 1/30/2001 at 8:05 PM

Phil,

Was thinking something along those lines. I could do what Frank suggest also. Cut the board and put up durarock. I put down durarock on the brick on the floor for the slate.

Don C.



Re: Mortar on Drywall
Posted By Heath Jimerson on 1/30/2001 at 10:47 PM

Don,
We're doing something similar in a bathroom. The customer wants 12" of tile going up around the their shower stall. I was planning to use durarock and butt it up to the sheetrock. The durarock would be 11 1/2", so that the tile would overlap 1/2" on the sheetrock. As we all know durarock is handy stuff, but still not as user friendly as sheetrock. Happened to be talking to the plumber, and he told me about something called dense-shield. Did some checking and sure enough- it's water proof sheetrock with a very hard rough surface like durarock. It's much lighter and easier to cut from what I gather. Will be using in about a week, so will find out firsthand. Just thought I'd throw another option in the pot.
Heath



Re: Mortar on Drywall
Posted By Don Czarniewski on 1/31/2001 at 2:25 AM

Heath,

This one is already set, and can't be changed (within economic reason). But I will keep you suggestion in mind. Thanks Don C.



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