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-   -   what size spacers and caulk to use (https://www.johnbridge.com/vbulletin/showthread.php?t=60797)

Rugbymikes 03-10-2008 08:40 AM

I am installing a 6" x 6" tile floor over an existing tile floor. I have thinset designed to cover the old tile.

Is it OK to use "Mosaic" tiles (~4) on the floor?

ceramictec 03-10-2008 08:47 AM

mosaic tile are usually smaller then 6x6's

Rugbymikes 03-10-2008 09:05 AM

Same size
The mosaic tiles are the same 6" x 6" size. They just have a metallic image in the center. The outside 4 inverted triangles are the same design as the main tiles.

They are 6 x 6 rialto noce tiles from lowes. Just trying to figure out if it is OK to use the mosaic ones on the floor. Only ~4.

Sort of looks like the tile image under your name.

ceramictec 03-10-2008 09:12 AM

you said you are setting this tile over other tile?

we need more info on this floor you are setting over,
is it sound?
any cracks?
tile size already down?

Rugbymikes 03-10-2008 12:02 PM


I am setting 6" x 6" tile over existing 1" x 1" tile. The entire floor is sound except for 1 loose tile in the far corner, behind the toilet adjacent to the tub and wall.

Do I remove the one 1" tile in the corner near the tub and fill that with thinset? The 6x6 obviously will have support from all around it and it is behind the toilet so it will never be weight bearing.

The thinset I bought is specifically for putting over existing tile. I guess it has more silicone than some brands. And I don't think I need to mask the previous grout as the thinset will find its way?

I purchased a TSP cleaner to get the oils off the old tile and plan to use 60 grit to rough it up a bit.

Do I do the flloor first, silicone the outside where the walls, tub and vanity meet, grout and then do the bullnose for the wall? Or can I do the floor, silicone the outside, and bullnose all at the same time? Do I do a spacer from the floor tile to the wall bullnose and fill with silicone or leave the bottom of the bullnose flush to the floor tile?

Still need some help on the mosaic on the floor question as well.

I am seeing discussion on removing haze and grout filling in the texture of the tile. The stone noce realto tiles seem to be slightly porous. Will I be challenged with this? Is using cheesecloth and water going to do the trick?

What am I reading about using a rounded stick for the grout? Is a 1/4" spacer right for 6x6 tile?



Mike2 03-10-2008 07:56 PM

Mike, what does ~4 stand for?

I'd recommend setting the tile first, both floor and wall, then caulk the perimeter. Leave a 1/8" space minimum between floor and what you refer to as bullnose for the wall.

Rialto tile has rounded edges so whatever spacing you choose will appear to be greater after it's grouted. Personally, I think 1/4" spacing is too wide for Rialto.


Rugbymikes 03-11-2008 08:55 AM


~4 means "about" 4. Am I able to put mosaics on the floor?

What size spacing do you recommend? 1/8" seems way too small but I agree that 1/4" may be too big.

If I do the floor and bullnose together, will I be able to get the silicone into where the floor meets the wall? Or should I just have the caulk gun handy and shoot the wall joint when I put the floor down and then do spacers off the top of the floor tile to line up the bullnose and come back later to caulk where the bullnose meets the floor tile?

All this assistance is great. Do I need to worry about sealing the tile itself or how the caulk will find the porous imperfections in the tile face?

Is grey grout ok or should I look for a beige?

Thanks again,


Mike2 03-11-2008 07:58 PM

Help to un-confuse me Mike. I am reading that you plan to install 6" tiles, "about" 4 inch tiles, and mosaic tiles on the floor. Are you really intending on setting three different types or am I just reading your post wrong?

Rugbymikes 03-12-2008 08:13 AM

Sorry for the confusion.

All tiles are 6" x 6" Rialto Noce. I purchased 4 decorative 6" x 6" tiles that have a design in the center (tilted square).

I wanted to ensure the deco tiles could be used on the floor. Also, comments were made that the 1/4" spacer is too wide. What size do you recommend?

Do I need to put a sealer on the tiles themselves? At what stage in the process? Before grout?



Rugbymikes 03-18-2008 07:45 AM

what size spacers and caulk to use
I am putting down some 6" x 6" NOCE Rialto tile that I purchased from Lowes in a second bathroom. I originally had planned on using 1/4" spacers but read that they might create too wide a caulk line and not look good with the tiles being slightly rounded at the corners.

Any suggestion on a spacer size? I think 1/8" would look way too small.

Also, the grout I am using is a beige color. Where can I find a caulk to slightly match to put around the outside edge of the tile and to seal the bullnose? I don't want to use a grey or white as it will contrast way too much.


MICK1 03-18-2008 08:30 AM

Some tile stores they do sell color Silicone and caulk, Another way you can do it is to mix the silicone in a tray with some colors (akemy/tenax,bonstone) to match the color of the stone.


MICK1 03-18-2008 08:31 AM

Tape the wall and the stone, and spread with your finger. to keep the silicone smooth wet your finger with some deanturet alchool, remove the tape right away.


MudGuy 03-18-2008 08:40 AM

Hey Mike -

Split the difference and use 3/16" spacers.

All grout manufacturers offer their own caulking in matching colors, both sanded and non-sanded versions. Sounds like you'll need sanded.

Seal the bullnose? :scratch:

bmichel 03-18-2008 09:54 AM

Matching caulk
I see you shop at Lowes. Laticrete (sold at Lowes) makes grout and matching caulk. I am using it now. Make sure you make the right choice between sanded and unsanded.

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