Rectified Porcelain Tile Cement?

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Old 03-15-06, 08:59 PM
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Question Rectified Porcelain Tile Cement?

Hello,
We are in the process of putting 20x20 rectified polish porcelain tiles over concrete floor but we have a question regarding the cement type used. The tile store personnel told us that we needed 2 types of cement mortar mix & sanded thin set mixed together and following there directions we purchased the two types in there store. But now we are left with the dilema that we don't have enough product and we can't return back to the same store, is it possible to continue with a different product like "versabond" without creating any problems? Also since we are new at this and new using this type of porcelain tile we notice that there is a wax or greasy dull surface and would like to know what will works best to remove this film after the installation of tile? Should it be removed before grouting or after grouting? Extremely Confused.... Please Help!
 
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Old 03-17-06, 09:16 AM
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All that is required is a "modified thinset mortar" to do this. You don't need any special concoctions what-so-ever. Over a concrete substrate 'modified' isn't even necessary. You could easily use Versabond or the next level up MaterBlend but either will work just fine. They are both modified and all you need to add is water. Adding anything else to the mix would only serve to jeapordize the bond.

Whatever you do, don't be suckered into using any of the 'pre-mixed' thinsets, THEY WON'T WORK.

You can't return "WHAT" back to the same store? What's that all about?
 
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Old 03-20-06, 01:24 PM
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Wink Another question?

Thanks for your clarification, we went and got Versabond. A lot less complicated than mixing two different types of cement.

But now we have another situation, the first few tiles were done with the mixture of mortar mix and sanded thin set, and we noticed that 2 tiles were not completely attached to the floor. One of the corners on each tile seems to not be cemented. Someone told us to just pour the grout and it will help it stick better and will not break. Is that true? Because we have continued quite far from where these tiles are located and I don't want to break them to pull them out because all the other corners are seriously cemented to the ground. Any suggestion with this problem?
 
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Old 03-20-06, 02:58 PM
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Make sure you are getting 100% coverage on those tiles. 20 x 20 is a big tile and its important that they are fully supported underneath. Pull up a tile every once in a while as you are setting them to make sure you are getting full coverage. Being as big as they are they may not come up easy. What size notched trowel are you using 1/2"?

As for the couple tiles you are talking about if theres just a little bit of the corners that your talking about, when you pack the grout into the joints pack it in good so that it goes under the edge of the tile. If theres more serious voids than that those tiles may eventually crack when walked on. You can't see under the tiles to see if there are voids in other spots beside the corners. Tap on the tiles with the wood handle end of a margin trowel to see if you hear a hollow sound. If you think these tiles may be a problem now is the time to remove them and correct the problem.

Pouring the grout? Don't water down the grout. Mix the grout to the right consistency according to the instructions on the bag. If you add to much water it will weaken the strength of the grout and you will probably also have color problems.
 
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Old 03-21-06, 09:25 AM
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The notched trowel we used is a 1/4"x1/4"x1/4" SQ and we also used a rubber mallet to make sure it is leveled. The tiles that we notice had 1 corner in each without cement only is just 2 inches from the corner that makes the hollow noise. So we will take your suggestion and put the grout as directed into the 1/16 inche grout lines hoping it hardens enough and seeps underneath to prevent future cracking of those 2 tiles. Removing them would be difficult since the other parts of the tile are completely cemented solid to the floor and we don't want to effect the surrounding tiles. So we are crossing our fingers and hope that the grout packed into it will do the job of keeping it from cracking in the future.

Thanks for the info!

Another question? We used china markers to make cuts on the difficult corners and now the black color china marker leaves a terrible stain on the tile surface that makes it difficult to remove with just water and scrubbing. Any suggestion on what product can be used to remove marks left by the china marker from this polish porcelain tile? Another obstacle, if I new we would not have used the black china marker, the red color china marker is easier to remove from the surface. What a mess. Please help! We now have visible blackish lines on our creme color tile.
 
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Old 03-21-06, 04:38 PM
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That concrete floor must be perfectly flat to be using 1/4 x 1/4 notch trowel on 20 x 20 rectified tile. I question if you are getting good coverage? If you have 2" voids with no thinset under the tile you need to stop right now pull those tiles up and reset them. Rectified tile this size would normally require a trowel 1/2 x 1/2 notched to get them perfectly flat and fully supported. I think you are taking a big chance by continuing this way.
 
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Old 03-21-06, 06:56 PM
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Now you got us worried. We did about ~200 sq ft, and we check all the tiles after discovering the 2 tiles corners were not attached. So you saying we should of used a 1/2 x 1/2 notched trowel. Our congrete floors are leveled, as we did check the leveling prior to starting and leveled any areas with leveling concrete. I think if we now continue with the 1/2 x 1/2 notched trowel, it will definitely be unleveled. Because that means the cement would laid a lot higher? right? Or would it be no difference in tile height compared to the previous tiles? Especially with the previous tiles already done with the 1/4 x 1/4. So that is definitely not feasible. Besides I am sure that the grout will correct the 2 tile problem we have. I feel confident that the all the other tiles are stable and cemented totally. The floor feels solid and you can see the difference from the 2 bad tiles.
 
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