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Old 05-30-2010, 09:59 PM   #31
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Removed tile around fireplace, drywall underneath?!


We have done a fair bit of slate at our place, still have about 50 square feet to go.

You will find that the sealer makes it a little easier to get the grout off. Just remember not to leave it on for too long. See what your instructions say on the bag (or box) and stick with them.

Looking mighty fine so far!

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Old 05-30-2010, 10:43 PM   #32
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Removed tile around fireplace, drywall underneath?!


Stone tiles such as slate (believe it or not) will absorb moisture. In this case the moisture from the thinset will wick into the back of the stone. The stone needs to be able to dry and evaporate the moisture within. Sealing this soon may not be the best idea. The sealer may turn white from the moisture and you don't want that to happen. If you have a fan I'd put a fan on it overnight.

Fortunately of all the stones used for tile, slate would be one of the least of the absorbent stones I think. No need to get in a big hurry now!
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Old 05-30-2010, 11:32 PM   #33
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Removed tile around fireplace, drywall underneath?!


Bud: We sealed our slate and didn't have any problem with it turning white. Mind you we let it sit for a couple of days first.

It's definitely true what you say about tile absorbing moisture.

I believe that porcelain is the least absorbent at under .5% isn't it? Almost everything else is 1% or higher I think.

I wouldn't have thought that sufficient moisture would be able to get right through a tile that quickly, just from the thinset. I suppose that would depend largely on the quality of the slate.

What would your opinion be on that Bud? Thanks.
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Old 05-31-2010, 09:46 AM   #34
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Removed tile around fireplace, drywall underneath?!


If by "quality" you are referring to density and density equates with quality, and a higher density stone is considered to be a higher quality stone then...this is true I suppose. Stone densities can vary within stone categories.

All stones can vary in density and can have varied absorption abilities.

Not all stone sealers are created equal.

I have seen both granite and marble tiles take weeks to dry out with the only source of moisture being from the thinset used to install them.

Porcelain on the other hand is man made and does have a controlled and predictable absorption rate of 0.5% or less.
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Old 05-31-2010, 10:30 AM   #35
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Removed tile around fireplace, drywall underneath?!


Thanks you. Yes, I guess I did mean density didn't I. Or maybe I should have considered porosity as a better choice.

I know that the marble I have to put around the soaker tub has what appears to be fine fissures in it. If you're not careful, the marble will easily crack and break across those lines.

Do you know if it is a standard practice to ever seal the back of such a tile before you install it? Or would that not permit the thinset to adhere as well?

Probably an oddball question, but one that just came to mind.
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Old 05-31-2010, 12:38 PM   #36
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Removed tile around fireplace, drywall underneath?!


I'm not sure porosity is a determining factor. For example; lava rock is of super high porosity and yet has a high density also. I'm not an expert, just know what I've picked up in the industry through the years.

Marbles that are highly fissured also (as you have found out) have a high mortality rate when they are in the form of a tile. I have seen marble tiles that couldn't be lifted from the box they came in with one hand or they would break. It takes two hands at all times to handle those suckers. Those are also the stones that when wet seem to soften even more and break very easily. They are also very annoying when being cut with a wet saw. In some cases when buying such stones one would have to order 50% more than really needed just to have enough to complete a given job.

The standard practice is to never seal the back of stone floor tile for the reason you mention. Actually that's a very good question.
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Old 06-01-2010, 09:24 PM   #37
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Removed tile around fireplace, drywall underneath?!


Alright, I finally got around to throwing the grout down. Wow once you grout you can REALLY see anywhere that you messed up. I didn't notice one tile was so damn crooked. Oh well, it is done now. I'm still proud of it. What an experience. Thanks so much Bud Cline!

I know it doesn't match the walls or floor, YET. Next is some dark hardwood floors and paint on the walls.

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Old 06-02-2010, 08:11 PM   #38
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Removed tile around fireplace, drywall underneath?!


Looks pretty good from here! Nice job.

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