Contractor Talk - Professional Construction and Remodeling Forum banner
1 - 20 of 34 Posts

·
Registered
Joined
·
5,057 Posts
Discussion Starter · #1 ·
So after the thread where Spencer asked about how people handle the top of the curb on a shower and quite a few of you guys mentioned granite, we are trying that on a job right now.

My questions is how do you attach the granite? I have kerdi fix for doing niches Angus style and thought I could do a cris cross pattern of that but I didn't know if that would support it or should I just use thinset?

And while you're reading anybody have a trick for pre-sloping a kerdi curb on top without just tilting it which messes up the sides? I plan to slope the granite with a shim that I will rip.

Thanks guys.
 

·
Carpe Diem
Joined
·
20,742 Posts
You should preslope the curb itself, never use thinset to create a slope. Thinset is not waterproof. Therefore, any moisture that does get under it doesn't have a slope to pitch it towards the drain.

To pitch a Kerdi curb, I just put a slight tilt on my table saw and run the foam through. Yes it's messy but for that 30 second task, you are done.

To adhere the granite to a membrane, put a skim coat of thinset on the curb, let it dry and silicone the stone to the curb.
 

·
Registered
Joined
·
5,057 Posts
Discussion Starter · #4 ·
angus242 said:
You should preslope the curb itself, never use thinset to create a slope. Thinset is not waterproof. Therefore, any moisture that does get under it doesn't have a slope to pitch it towards the drain. To pitch a Kerdi curb, I just put a slight tilt on my table saw and run the foam through. Yes it's messy but for that 30 second task, you are done. To adhere the granite to a membrane, put a skim coat of thinset on the curb, let it dry and silicone the stone to the curb.
That makes a lot of sense on the slope issue. I will do that. So just 100% silicone no need for kerdi fix?
 

·
Carpe Diem
Joined
·
20,742 Posts
Kerdi-Fix is badass, no doubt. I'm just not 100% sure what it will do to the stone (will it seep in and stain?) Just go with what the stone installers use on millions of successful installations.

Most important is to preslope your curb BEFORE you add any waterproofing, skim coats, etc.
 

·
Registered
Joined
·
5,057 Posts
Discussion Starter · #6 ·
angus242 said:
Kerdi-Fix is badass, no doubt. I'm just not 100% sure what it will do to the stone (will it seep in and stain?) Just go with what the stone installers use on millions of successful installations. Most important is to preslope your curb BEFORE you add any waterproofing, skim coats, etc.
Sounds good. Silicone it is.

At your recommendation on the slope I pulled the curb yesterday, ripped it 3° and re-installed it. I'll wrap kerdi and skim it before installing granite.

I should go ahead and say thanks to you now that your back. I've read 100's of your posts and learned so much more about tile than I knew. Thanks for all your advice you give on here!
 

·
Carpe Diem
Joined
·
20,742 Posts
I don't install slabs. The stone installers that I've used (many 4-5 different ones over the years) all use silicone. If that's what the pros use, why would I question that?

But yes, the biggest reason I wouldn't want to use a thinset would be the potential reaction. Especially with a lighter colored granite, I would worry about possible staining from underneath rising up to the surface.
 

·
Registered
Joined
·
1,038 Posts
Silicone is not an adhesive , it's a sealant . If your going to go that route I would use phenoseal , it's a sealant and adhesive in one . It can also be used to hold down granite tops . I would use thinset to install a granite curb just as I would use thinset to in stall a marble or granite door saddle .This was how I was taught and believe it's done this way in my neck of the woods . As far as being the 1 % I guess you can say it's how you were taught or how it's done in your neck of the woods .
 
1 - 20 of 34 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top