Is it OK to apply thinset to cured thinset?
I’m tiling my shower walls and managed to finish about 1/2 a wall. I scraped off the thinset where it wasn’t covered by any tile. However, there is a smooth surface now where the scraped thinset was.
I’m pretty sure that I can simply apply new thinset over the old thinset without any problems. Just want to confirm.
Should I rough up the old thinset at all?
Thanks in advance.
Replies
stone off a little more if you can abd go for it...
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use a rubbing stone/brick that looks something like this...
make sure you get rid of any dust on the wall's surface...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming
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Forget the primal scream, just ROAR!!!
thinset will stick to anything, even thinset, your good to go. I often scrape it off when a tile needs to be cut, then go back later mark cut and rethinset to intall them ..
One more question...I've got a tarp over the tile right now so we can continue to use the shower. It's my only shower.
The tarp is keeping the running water off of the tile and the cbu is dry and chalky to touch. The tile however has a moist film over it. It's due to the steam condensing on the tile.
I'm going as fast as I can. In the meantime, is there any danger to the integrity of the tile and bond to the cbu due to the condensed moisture?
In the meantime, is there any danger to the integrity of the tile and bond to the cbu due to the condensed moisture?
certainly...
and wait till you see what happens to that backer board after it wicks up some water and moisture...
that is why it appears dry and tile doesn't... it may delaminate...
in the mean time use the sink or a garden hose and not the shower...
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Forget the primal scream, just ROAR!!!
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I don't know about delaminating. Example. My family's old shore house was built in the early 50's. The outside shower was added in the late 60's. It was a simple painted 2x4 frame with painted bead board on the exterior and a product that was very similar to Hardi Board on the interior. The only thing preventing me from calling it Hardi Board is the absence of any label. 3x5 sheets 1/2" thick. In fact, before the house was torn down, out of curiosity, I took a hammer to it to see what it was, and I couldn't tell any difference. The shower was used year round for thirty + years, and there was never an issue with the "hardi" product. It doesn't belong in the new 8 million dollar house that now sits there, but it had it's appeal and was a perfect fit for a 50+ year old beach cottage. Also, the hardi displays have a chunk of hardi submerged in water with no adverse effects.If you are talking about the tile delaminating from the hardi, thats a different story.
aqnd taking a layer of Hardi with it...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!
Forget the primal scream, just ROAR!!!
"Some days it's just not worth chewing through the restraints"
Cement board for tile has been around for a long time.
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the added moisture will allow the thinset to hydrate a bit slower and be a bit stronger in the end.
the cbu doesn't care if it's a bit moist... it gets that way when you spread the thinset for goodness sakes.A La Carte Government funding... the real democracy.
If I'm feeling ambitious, I'll mist the hardi before I spread the thinset too. But unless the spray bottle happens to be right there for me, I won't do it. :)
You are fine as long as you don't have soap and running water going over this before it cures.
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The tile and thinset were allowed to cure about 15 hours before I even turned the shower on. The walls, tile, and thinset have never touch water directly. I have a 4 mil poly sheet over the entire shower area.I know you can lightly mist the grout to help it cure slower and stronger. I didn't know that about thinset. I guess the principle is the same since they are both cement based.I feel a little bit better now. Still, I'm taking 2 vacation days to give myself a four day weekend to get it all done. I've been taking detailed measurements and will make hopefully 90% of cuts before I even mix up another batch of thinset. Goal is to get it all done and grouted this weekend. I've got a ceiling to do too in the shower...that may take more time.Thanks for the help. I've learned alot from this site ever since I bought my house 10 years ago.