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J187 08-31-2012 03:17 PM

Tiling a small entrance way, found some moisture
I originally was going to tile over the existing whereas the height would be no issue. When I tested the tiles for bond strength, they pulled right up. I cannot identify what is on the floor and the bottom of the tiles - I can't tell if it's the remnants of some laminate flooring they tiled over, or the stained, dried thinset. The underlayment is the concrete basement floor - this is a split level.

I tore up all the tiles and I will tile over the concrete. I did find a tiny bit of moisture, tiny little beads of it, under the floor in some places. I'm not sure how to proceed. This area is a simple 25sq ft area between the garage entrance and my downstairs family room which is carpeted. Should I just seal the floor and tile?

oh'mike 08-31-2012 06:17 PM

It looks like you have a black ,tar like , adhesive---cut back---how old is that house?

If it is cut back--you need to make a modified thinset by mixing unmodified with a liquid latex.
Kerabon and Keralastic by Mepei is a good example.

Bud Cline wrote an excellent piece on thinsets--"Mud" What Is It? - Kitchen & Bath Remodeling - DIY Chatroom - DIY Home Improvement Forum

J187 09-01-2012 10:45 AM

House was built 1961. How can I tell if it's cutback? So you think that perhaps someone tore up a vinyl floor that had cutback and then tiled right over the cutback with thinset?

oh'mike 09-01-2012 10:47 AM

That's what it looks like to me----if the correct thinset is used--no problem---if not --the tiles can pop off easily

J187 09-01-2012 12:19 PM

I see. Thanks. So is this the same modified thinset I'd use for tile over tile?

oh'mike 09-01-2012 10:26 PM

You would be safe using the two part for tile over tile--although a good quality modified will also work.

Whenever I face a possible bonding challenge I use Kerabond and Keralastic (or something similar) Just good insurance.

notmrjohn 09-01-2012 11:58 PM


Originally Posted by oh'mike (Post 1000668)
It looks like you have a black ,tar like , adhesive---cut back---how old is that house?

:thumbup::laughing: Oh man! The timing was perfect, I can even see the puzzlement on your face, then the disbelieving realization.
I remember "helping' dad lay floors when i was a lad in late 50's early 60's. that stuff was nasty. He'd finally send me out to wait in the truck, so's I wouldn't be tracking it all over, he didn't need me to hand him tiles for a while. " How'd you get it on the front door, when did you go over there?"
Thanks ,mike, I'm still laughing.
But wait, "tiny little beads of it (water) under the floor." but as I remember the sweat from Dad's forehead would bead up on that stuff. I think the water could have come from topside and not seeped up. Funny thing, the longer I helped Dad, the more he would sweat, you'd think it would be the opposite.
Tar like... noooo could it be? Oh man. Thanx.

J187 09-03-2012 06:41 AM

Thanks. Some 747 and a razor scraper made pretty quick work of it. Down to pretty much bare concrete now.

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