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-   -   kitchen granite tile countertop, grout and second question (https://www.johnbridge.com/vbulletin/showthread.php?t=63211)

Evert 05-28-2008 12:02 PM

kitchen granite tile countertop, grout and second question
 
We are starting on the kitchen counter, and are using 12" granite tiles. Two questions are: what type of grout should we use, unsanded? Epoxy? The color is Ghibili, a soft gray.

The second question is whether we need to use poly film in the sink area, between the cement board and the plywood, and if we do should we thinset the CB to the poly or just screw the CB down over the poly?

The bath tub surrond and all floors are done, thanks once again to John and this site. Will post pictures soon.

GraniteGirl 05-28-2008 01:17 PM

I am not going to even try to advise on your other questions, but I will tell you to test your stone for absorption. Ghibli is a a pretty thirsty Indian stone and will most likely need some sealer.

Would LOVE to see your pictures. :D

kerdibird 05-28-2008 04:29 PM

No poly, just screw it.
You could use thinset under the cbu, but it's not necessary for a countertop.

You should consider using Ditra instead because it gives you less build-up, and more waterproofing. :)
You could also use a liquid/bonded surface applied membrane like Kerdi or Redguard for water control.

Ken 05-28-2008 06:28 PM

Not sure what art is thinking, however you should always thin-set CBU down to a horizontal substrate and properly fasten it.

kerdibird 05-28-2008 06:37 PM

And why pray tell is that?
We're not talking about a floor here.
I'd be happy to see two layers of ply alone with tile right on it for a counter top.
Adding cbu with redgard or plywood with ditra are both options for the guy who's concerned about water damage.

kerdibird 05-28-2008 06:39 PM

You can't use redguard very well over plywood, which would be my only reason to use cement board on a tile countertop, which is why ditra with one layer of 3/4 ply is the most sensible option imo.

Ken 05-28-2008 06:41 PM

Because thin-setting the backerboard down to the top's plywood, would be in according to TCNA Method C513 (Wood Base Countertop Installation) in the 2008 handbook.

bigd777 05-28-2008 06:43 PM

why not just mud the counter top

kerdibird 05-28-2008 06:46 PM

Tiling directly over plywood is also deemed respectable in some circumstances.

Ken 05-28-2008 06:47 PM

Mudwork, obviously would be the best option, in my opinion. But it does not seem to me like a very friendly time for a DIY to try. Though I could be wrong. We've walked many people through mud work on here.

kerdibird 05-28-2008 06:59 PM

Mudding countertops?
Come on guys.

bigd777 05-28-2008 07:15 PM

u would never tile over plywood . how long have been doing tile .i would never do that .its going to fail

kerdibird 05-28-2008 07:17 PM

What do you know of tiling over plywood? :idea:

bigd777 05-28-2008 07:18 PM

thats its not a good thing to do

Ken 05-28-2008 07:19 PM

Back on subject guys. Quit debating the undebatable.

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