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-   -   What kind of thinset mortar to use for installing slate on top of aggregate? (http://www.diychatroom.com/f5/what-kind-thinset-mortar-use-installing-slate-top-aggregate-81789/)

TitaniumVT 09-19-2010 01:59 PM

What kind of thinset mortar to use for installing slate on top of aggregate?
 
We have a concrete (aggregate) front porch, and I'd like to install slate tiles on top of it. I'd read that you need a special type or mortar(thinset) when adhering stone to a stone substrate. Does anyone know what kind of mortar/thinset I'll need to use for this project?

Thanks in advance!

Bud Cline 09-19-2010 03:37 PM

If you are talking about a concrete with an expossed aggregate surface, any modified thinset will work. It would be better however in my opinion for you to use unmodified thinset but to modify it using your own additive rather than water. For example: Mapei's Kerabond thinset mixed with Mapei's Keralastic additive. There are others.:)

If your surface is an epoxy-aggregate surface, the old surface should be removed totally.:)

TitaniumVT 09-20-2010 02:09 AM

Thanks very much for the insight, Bud. Yes, I'm talking about a concrete patio with exposed aggregate. I'll do as you suggest and try an unmodified thinset. Thanks!

Bud Cline 09-20-2010 08:33 AM

Quote:

I'll do as you suggest and try an unmodified thinset.
Don't forget...the unmodified thinset in this case MUST be mixed with the proper additive, not water.:)


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