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Old 02-26-2011, 12:57 AM   #1
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Silicone on Hardibacker Seams


In my excitement to get started with tiling, I think I messed up...I have a counter downstairs that will be used in a mother-in-law suite kitchen area (so a lightly used kitchen). I have hardibacker down and recently put silicone into the seams that run between the boards and where the hardibacker butts up to the wall.

1. Is that going to cause a problem? I'm reading now about taping the joints and am wondering if I'm going to have to pull the silicone out.
2. What do I do with the gap between the hardibacker and the wall. I.e. how do I "fill" that space? Will silicone be okay there? (Hopefully, because I just did it to the upstairs bathroom as well).
3. Could someone briefly explain the steps to tape the seams?
4. Should I redguard the countertop? I doubt it will be exposed to much water, but there may be some.

Lesson learned: read up first!

Thanks

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Old 02-26-2011, 11:58 AM   #2
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Silicone on Hardibacker Seams


Not an expert here but I've done a couple of tiling jobs. I'm sure someone will stop by and tell me if I'm wrong.

In your shoes I wouldn't worry about the silicone already along the backsplash.



To tape the seams, you mix your thinset rather thin. Dampen the hardiebacker. Spread a thin layer of thinset along the seams, press the tape into the thinset and carefully smooth with the flat edge of your trowel. Make you have the mesh tape for CBU, not drywall. There is a difference.
If you are not using Redgard you can do this as you tile. If you are using Redgard you will have to do this first, let it dry, apply Redgard, then tile.

My summer project will be tiling my kitchen counter tops. My plan is to install hardiebacker over plywood. Then apply Mapelastic HPG ( a product similar to Redgard) Then tile. Last step will be to caulk the backsplash edge. I'm thinking of skipping the tape because it will make getting a level counter top more difficult, and counting on the Maplastic to stop any water that penetrates.

I'm hoping one of the guys will stop by and let us know how essential it is to tape a counter top.

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Old 02-26-2011, 02:41 PM   #3
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Silicone on Hardibacker Seams


Hi there,

I am thinking the same...to just let it slide. I guess the taping is for allowing for movement and so the grout lines don't crack. I'm going to assume silicone will do the trick and allow for slight movements/expansion/contraction.

How are you tiling your kitchen countertops? I'd like to try granite tiles, but I've heard that can be much trickier.

Thanks again!
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Old 02-27-2011, 01:33 AM   #4
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Silicone on Hardibacker Seams


Quote:
Originally Posted by suzyling View Post
How are you tiling your kitchen countertops? I'd like to try granite tiles, but I've heard that can be much trickier.
I haven't made a final decision yet. It doesn't really matter though, I'll probably change my mind two or three more times before I start anyway.

I am considering granite tiles, but like you said, they can be tricky. Any lippage will be obvious. There is also the consideration of how to finish the front edge if bullnose is not available. I'm not going to start it for a couple of months, so I have time to do more research and figure everything out.
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