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Unread 05-01-2018, 05:11 PM   #1
john619
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Exterior tile application to CMU?

I have a client that would like to upgrade their outdoor bbq area with a fireplace on one side of the CMU enclosure and a built in BBQ area on the other side. I have attached a photo that explains what the intent is conceptually.

We intend to frame these areas out of metal studs where required to accommodate the fireplace depth, and of course the BBQ counter and worksurfaces as well. These would then be sheathed in cement board for tile application. Looking for any ideas or concerns that I should be aware of.

I am thinking that waterproofing would not be needed.

There will be areas where the tile would be applied to the CMU without framing. What needs to be done to the CMU in that situation?

I know I will have more questions, but I wanted to hear what you smart folks have to say.
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Unread 05-02-2018, 09:15 AM   #2
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Use the paper-clip icon above the Reply dialog box to attach photos from storage on your computer, John.
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Unread 05-02-2018, 11:27 AM   #3
john619
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Ok, I figured out the photo issue!

Comment away all............

I am looking at TCNA W202E-16 for application to the CMU, and W244E-16 for application over metal framing.
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Unread 05-03-2018, 10:53 AM   #4
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Unread 05-08-2018, 05:28 PM   #5
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First question. On the fireplace feature side there will be essentially a 20" or so furred out section to receive the firebox, above the firebox it will return back to the CMU wall. on either side of the fire place section there will be about 18" tall by the 20" depth sections that form something like tables on each side.

These tops will have a positive slope to shed water. 1/4" per foot minimum. These horizontal surfaces will then get tied back into the tile applied to the CMU wall. I am concerned about waterproofing and structural strength of the substrates. The table like sections someone will definitely stand on. I propose having some exterior grade plywood under the cement backer board for strength. 1/2" - 3/4" plywood.

Then a liquid applied waterproofing membrane would come down the cmu wall and transition to the cement backer boards on the fireplace enclosure to attempt to keep things watertight.

Am I headed in the correct direction?
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Unread 05-10-2018, 12:15 PM   #6
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317 views and no responses?
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Unread 05-10-2018, 01:24 PM   #7
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How do you propose to tie the horizontal surfaces into the block wall? Is there any reason they couldn't also be made of concrete block?
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Unread 05-10-2018, 10:08 PM   #8
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Neither tile, nor cement, nor grout is waterproof, so the metal studs underneath would be subject to moisture and therefore rusting. You really might want to consider waterproofing. Another hassle you may have is heat depending on the fireplace for any waterproofing.
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Unread 05-11-2018, 08:31 AM   #9
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I would tend to agree, why not use block and keep it all the same instead of mixing wood, metal and cbu. My initial thought is to use Ditra on the block for movement, Kerdi the seams of Ditra for water proofing on the vertical. Kerdi on on horizontal planes.

I would make a call to Schluter and Laticrete and others and gets some feedback. Thats a unique situation, and personally I'd want a manufacturer to say they'll back it. Whatever you chose, I'd have them there when you get going on that part and get there approval in person. Looks like you'll have some money tied up, easier to sleep when someone else is backing your warranty with you.
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