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Old 07-12-2018, 02:41 PM   #1
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Can you provide some tips on my outdoor kitchen stone?

Hi guys, I just finished building my outdoor kitchen. It consists of 18GA steel 16"OC and 1/2" permabase cement board. I am getting real stone veneer delivered next week and would like to get ready for the install. My two questions is :

1-) before I put a layer of scratch coat on the boards do I have to use fibatape on the seams??

2-) I have several portland cement bags left, can I use them for the scratch coat? If so do I add sand??

Thank you guys!!
Any other tips are appreciated!!
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Old 07-12-2018, 05:25 PM   #2
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Use alkali-resistant mesh tape on all the seams.

I think you'll want to add some sand to the portland for the scratch coat. Probably 3:1 sand to portland. I've seen some installers use a notched trowel to make the scratch coat, or you can put some on with a flat trowel and cut lines in it with a stick or something similar.

What kind of fasteners did you use to attach the cement board?
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Old 07-12-2018, 05:27 PM   #3
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Kman, thanks man. I just noticed I have Portland Type I/II, is that ok??
The store recommended Starborn cement board high-low screws?8x1 1/4. Was not fun screwing into 18GA metal studs
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Old 07-12-2018, 06:31 PM   #4
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That Portland will work fine. You'll need to make wall mud for the scratch coat which would be 3 sand, 1 Portland and 1 lime. If that mix is too sticky, cut the lime down to 3/4. I would staple a layer of #15 felt paper and then screw lath to the board before scratching.

They make a rake just for scratching. I believe Home Depot has them in their concrete tool section. I have also used a small piece of lath to scratch with, about 5 inches square. The rake works best.
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Old 07-12-2018, 06:45 PM   #5
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Davy, why is felt needed on cement board?
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Old 07-12-2018, 06:52 PM   #6
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Just to keep water out. Cement board isn't waterproof.

Here's a link to a scratch rake. https://demandproducts.com/OWA/Produ...ndle-scarifier

If you're going to use felt and lath, you could omit seaming the cement board.
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Old 07-12-2018, 06:56 PM   #7
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I appreciate the help guys are giving me. I will be doing the scratch coat this Saturday. I need to install the vents tomorrow and do plumbing. One thing that is bothering me is that I mounted this island directly to my pavers.I am wondering if I should have placed on top trex to keep it off the ground? The patio is pitched AWAY from the outdoor kitchen but I am worried about snow sitting there and melting.
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Old 07-12-2018, 07:02 PM   #8
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What kind of countertops are you planning to have?
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Old 07-12-2018, 07:03 PM   #9
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I am probably going for granite.
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Old 07-12-2018, 07:10 PM   #10
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When I mentioned the felt paper, I was thinking of keeping the water out of the inside. Sounds like water might be able to seep in under the stone and steel framing. Is that what you're thinking?
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Old 07-12-2018, 07:12 PM   #11
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Exactly. The steel is obviously galvanized but it sure is no T304 SS> So I am worried over time it might rot? Not to mention the edge of the cement board possibly rotting overtime from it always in contact with the pavers?
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Old 07-12-2018, 08:15 PM   #12
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Doesn't sound like you're planning to build a roof over it. I'm sure building it on a concrete slab would have been better. Are the pavers going to give it a well supported surface? If it starts to shift and flex, I can see stone falling off. And, you know the granite won't like movement.
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Old 07-12-2018, 10:00 PM   #13
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I am sorry, did not explain it right. I actually poured a 6 inch slab of concrete for the base. It is mounted in front of the pavers. I should have explained it better.
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Old 07-14-2018, 10:53 AM   #14
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Well guys. I cleaned the boards and then dampened it right before scratch coat.
3 sand, 1 type I/II and 1 lime. It sticks to the trowel but falls right off the board, will not stick for anything Possibly to much sand? Please help, thanks
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Old 07-14-2018, 12:16 PM   #15
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That's the reason for the lath, Ralph.
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