tile over.....

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Old 11-04-08, 10:12 AM
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tile over.....

this may seem like a stupid question but, would mortar stick to a portland cement surface?
 
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Old 11-04-08, 12:10 PM
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Dave

What are you calling mortar? What kind? What are you trying to do?
 
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Old 11-04-08, 04:13 PM
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im trying to.....

use fortified tile mortar to lay ceramic tile over a portland cement finished concrete slab. the slab undulated in a few areas so I overlaid portland cement using a squeegee. I have a nice planed surface now, but now its time to lay out the tiles...so....will the fortified mortar stick?
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Old 11-04-08, 05:48 PM
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Why did you apply portland cement over a slab? How did you do this?

Do you have pictures? (upload them to a sharing site, then post IMG url here)

Thinset will adhere fine to a unsealed, clean concrete slab.
 
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Old 11-04-08, 08:01 PM
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the portland...

Cement seems to adhere very well. It's incredibly MUCH harder than a thinset for planing. I made my own ...self leveling mixture using pure portland cement. I used gloves and a resperator when I mixed this stuff because its pretty mean if it gets inside you. I mixed the stuff...just liquid enough to spread easily with a 30" squeegee, smoothed immediately after pouring it and it dried up harder than I could have imagined. nice and smooth surface, but less expensive than that self leveling compound stuff you could buy at home depot or lowes. the slab was porous and so it sucked up the portland cement. And besides I felt I didnt need to latex prime that slab like I would have needed to do before using the leveler that lowes or home depot offer. One less step. I have photos....so where can I post them?
but...will my fortified mortar adhere to my mixture?
 
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Old 11-05-08, 06:56 AM
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The thinset will bond to the portland patch, no problem. Whether your homemade slc with no primer will stand the test of time remains to be seen. Good luck with your project.
 
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