Ready to lay new tile?

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Old 08-07-10, 08:14 AM
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Question Ready to lay new tile?

I have glazed porcelain tile in my kitchen..my house is not on a concrete slab. Our fridge leaked water underneath so were having to replace some tiles and remove mold. Ive removed the tiles..scraped off all the old mastic and mold..am i ready to start laying the new tile? Also if the particle board is now a little lower should i put a thin layer of something underneath the tile so my floor stays even?
 
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Old 08-07-10, 08:51 AM
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Someone laid porcelain tile on particle board with mastic? How many more things could they have done wrong?
 
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Old 08-08-10, 08:27 AM
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Are you sure it's particle board and not OSB?

Like mentioned, you cannot tile onto particle board if you have it. You would need to install new plywood and install a cement board or Ditra product. There is only one approved method for tiling directly on plywood, and I can guarentee you won't be able to do it here.
 
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Old 08-08-10, 09:58 AM
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oops my bad..it is OSB. Theres a reason im on this website lol (im too cheap to hire a professional)
 
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Old 08-08-10, 10:02 AM
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it is mastic though im positive
 
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Old 08-08-10, 12:04 PM
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Mastic is to never, ever be used on a floor. It is made for wall tile. It won't hold up to foot traffic.
 
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Old 08-08-10, 02:48 PM
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It seems like alot of people use/used it on subflooring..what would you suggest I use instead when I get ready to lay the tile?
 
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Old 08-08-10, 03:30 PM
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Powdered thinset, like Versabond. They typically come in 50lbs bags. How many tiles are we talking about here?
 
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Old 08-09-10, 10:05 AM
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around 25 give or take. Would i be able to put a thin layer of that on the osb before the tile if it does turn out its a little lower now that ive shaved some off to get rid of the mold n stuff?
 
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Old 08-09-10, 10:12 AM
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Maybe I'm doing something wrong but I always put the thinset on the floor, not the tile
 
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Old 08-10-10, 05:51 AM
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basically i want to know if/what i need to put inbetween the osb and the tile
 
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Old 08-10-10, 05:55 AM
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Question

Are you saying that the original tile installation was directly over osb?
 
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Old 08-10-10, 07:33 AM
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No i removed all of that..but not sure whats the best but not necessarily the most expensive thing to use
 
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Old 08-10-10, 11:11 AM
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So you currently down to the OSB subfloor, yes? You can install 1/4" cement board or an isolation membrane (like Schluter Ditra) over the OSB. Whichever you choose, read the manufacturers installation instructions and follow them to a T.
 
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Old 08-10-10, 11:40 AM
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The problem seems to be that the OP is only replacing a portion of the tiles and is concerned about having the repaired area at the same level as the existing tiles.
 
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Old 08-10-10, 12:46 PM
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Thanks Wayne

I still not clear hear though.

Are you saying that the original tile installation was directly over osb?
No i removed all of that..but not sure whats the best but not necessarily the most expensive thing to use
So what exactly did you remove besides the tile?
 
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Old 08-10-10, 01:34 PM
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The adhesive, grout, and black mold. Thanks the cement board does answer one of my questions but i am also wondering about ensuring that the repaired part of the floor is level with the rest. Im thinking I will go ahead and get the cement board and then I guess go from there if that doesnt level it out on its own. I dont think ive removed more than 1/2" at most off the osb.
 
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Old 08-10-10, 03:53 PM
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It will not be level with the rest of the floor if you add cement board when it was not normally there.

I see two options (I'm tired, so others may chime in)

1. Tear up the whole floor and start fresh

2. Use thinset and lay your tile right back onto the plywood (not recommended, but sometimes you gotta do what you gotta do.)
 
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