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Unread 08-13-2022, 09:44 AM   #1
stackstoneveneer
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Please verify plan OK for stacked veneer stone at fireplace

Appreciate any feedback/recommendations regarding this plan-

Renovation: Updating 50yr-old wood-burning fireplace with a Napoleon Oakville gas fireplace insert.
Plan: Attached pic shows 20ga steel framing for 64" wide Eldorado Silver Linings stacked veneer stone, with 1/2" Durock around firebox framing perimeter.
Next steps:
Install fiberglass batt insulation.
Install 1/2" Durock using 1-1/4" RockOn screws
Install Eldorado Silver Linings following the seller's direction (he's also an installer) in caps below, with my Q's/comments lower case in italics:
•LATICRETE 254 PLATINUM THIN-SET (TWO 50# BAGS) -good choice?
Install Durock smooth side out? Have read it doesn’t matter -smooth/rough side?
•MESH NOT NEEDED FOR THE DUROCK JOINTS. -OK to skip mesh?
•SET 1ST ROW DIRECTLY ON FLOOR. *FIRST VERIFY FLOOR LEVEL AND SHIM IF NEEDED
•IMPORTANT: SPRAY-WET DUROCK AND VENEER BEFORE APPLYING THIN-SET.
•BACK BUTTER 1/4-1/2” THICK WITH MARGIN TROWEL. NO NEED FOR ½” NOTCHED TROWEL OR A SCRATCH COAT.
•APPLY MILD PRESSURE TO SET VENEER –PLACE AGAINST BOARD AND SLIDE 1-2” OVER.
•CHECK LEVEL EVERY ROW –INSTALL WEDGES IF REQ’D. (NO CHALK LINES)
•TILE SAW WILL WORK GREAT TO CUT ELDORADO SILVER LINING.
•SUPPORT FOR STONE OVER FIREBOX: 1” ALUMINUM L-CHANNEL SCREWED TO FRAMING.
I plan to install the L-channel when stacked stone reaches that level, to ensure it exactly meets up with that course. For added support, plan to add construction adhesive when screwing L-Channel to Durock, and also use the longest pieces of stacked stone extended beyond each end of L-Channel.
•HOW PLAN VERTICAL FINISH HEIGHT –CAULK IF GAP ½” OR LESS. CUT STONE FOR GAP >1/2”. JUST INSTALL AND DON'T WORRY ABOUT WHAT FINAL GAP WILL BE.

Thanks for your time and any feedback provided.
The seller's directions make the job easier than the standard directions, so if no big concerns here then would like to follow them.
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Unread 08-13-2022, 05:45 PM   #2
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Welcome Walt, first off, you might show a pic of a few pieces of the stone with the joints spaced like you want. The thickness of the stone could be important and determine the thinset thickness, how it's applied and if the Durock needs to be damp or not. If the stone is real thick, you might want the Durock dry to help set up the thinset mortar. A thick stone might fall off if the Durock is wet.
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Unread 08-13-2022, 07:09 PM   #3
stackstoneveneer
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Davy, thanks for your reply-

I'm helping a relative, and not there to take pics.
If you google the following there's a couple good pics at the first result (I can't message links yet):

fireplace stone patio eldorado silver lining


Eldorado Silver Lining dimensions:
3 Lengths: 8", 12", 24"
All are 4" H
All average 1-3/16" D

Please LMK if any other info needed -THX!
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Unread 08-14-2022, 07:28 AM   #4
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The 254 Platinum thinset will work fine.

I see no reason to skip taping the Durock joints. I'd do it, won't hurt anything and might help.

I wouldn't set the first row on the floor, raise it up just a little, maybe 1/8 inch.

I doubt you need a half inch of thinset. Get 100% coverage, that's the main thing.

You can wet the Durock but I wouldn't saturate it. Play this by ear, if the stone wants to slide around too much, you know you have it too wet. Thinset sticks very well to dry surfaces. The reason to wet the Durock is so it doesn't pull too much moisture too fast out of the thinset.
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Unread 08-14-2022, 08:27 AM   #5
stackstoneveneer
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Davy, thanks for your reply-

Glad that 254 Platinum confirmed OK. From what I've read, apparently provides a great bond.

No problem taping the joints -but would skip if confirmed not important. Tape is only $10 and won't take a lot of time.

Will shim the first row 1/8". Assume helps with any future floor replacement. After the veneer stone installed, do you leave that gap or fill it with caulk? With the great 254 bond, suppose that additional support at the floor not needed?

Agree that 1/2" thinset is a lot. He said 1/4" to 1/2" so planned to go with 1/4" and see how that goes. Priced out the 254 at $70/bag -don't want to use more than needed!

Will keep your advice in mind about wetting the Durock.

Thanks again -appreciate your time providing Pro Advice!
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Unread 08-14-2022, 10:13 AM   #6
stackstoneveneer
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A Q still wondering about, from my OP:

Install Durock smooth side out for this veneer stone install using 254 Platinum?

Have read it doesn’t matter whether Durock smooth or rough side used?

THX
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Unread 08-14-2022, 10:45 AM   #7
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You should get a bit better "bite" with the rough side out.
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Unread 08-14-2022, 06:12 PM   #8
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Quote:
Originally Posted by stackstoneveneer
Will shim the first row 1/8". Assume helps with any future floor replacement. After the veneer stone installed, do you leave that gap or fill it with caulk? With the great 254 bond, suppose that additional support at the floor not needed?
I left the 1/8" gap when I did my fireplace and it's not noticeable at all. However, pay attention to whether or not your cement board stands out as much lighter (or darker) than you floor or stone as you may be able to see it, or maybe not. Mine backer was visible (standing far away at the front door) as I have dark floors and stone so I just put a thin line of dark paint on the cement board before the first course of stone.
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Unread 08-14-2022, 06:47 PM   #9
stackstoneveneer
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Thanks for your replies-

Lazarus-
Will install Durock rough side out for that xtra "bite".

Snets-
The Durock will rest on the floor sheathing exposed when the hearth was removed. They have left-over 3/4" pre-finished flooring from another project that we'll lay over the sheathing up to the carpet. (The flooring will go down then the 1/8" gap set above that.)
They plan to install a new floor in this room "in the near future", therefore not nailing the flooring down -it's just temporary. If the Durock is visible, we'll be able to address that after the install.
Good tip -THX!
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Unread 08-14-2022, 06:50 PM   #10
stackstoneveneer
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Smile

BTW-
Snets that's nice work on your fireplace!
Hope this project looks as good
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Unread 08-14-2022, 08:01 PM   #11
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I agree. Nice job, Snets.
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Unread 08-16-2022, 07:46 PM   #12
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Installing Durock panels, and have a follow-up Q:

The "USG Durock Brand Cement Board Installation Guide" pg. 4, Floor Installation, directs "Stagger joints a minimum 16" so four corners never meet

pg 5, Wall and Ceiling Installation, has no staggered joint requirement.

I want to cut and set the two top Durock panels directly over the lower panels, continuing the EdgeGuard along that center seam to help with tight screw placement on the metal stud.

Correct to interpret that for walls, it is OK for 4 Durock corners to meet?

Thanks for your time!

[ATTACH]225385[/ATTACH"
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Unread 08-16-2022, 09:04 PM   #13
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It is not, but you can do it if you want. They do not want the four corners meeting in any installation of Durock panels.

USG was never very good at writing specification material for their tile industry products.

My opinion; worth price charged.
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Unread 08-17-2022, 04:47 AM   #14
stackstoneveneer
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CX, thanks for your reply-

Reading between the lines-
Durock wants joints staggered for all installations, but doing so for the one joint on this install doesn't create great concern(?)

The ClarkDietrich PROSTUD 20's are narrower than a std 2X4, requiring screws be driven tight to the edge. Don't know level of risk with the one unstaggered joint, but expect high risk of crumbling board by driving screws tight along non-EdgeGuard edges!
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Unread 08-17-2022, 07:30 AM   #15
stackstoneveneer
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To get confirmation, just talked to USG rep at 800-874-4968.

They immediately replied "don't worry about staggering joints for walls".

They said they are getting rave reviews for EdgeGuard preventing blowouts when driving screws.
Hope that I have the same success!

Providing this "final answer" to staggered wall joints Q for anyone coming across this thread.

THX
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