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Unread 04-22-2010, 10:24 PM   #1
MDahn
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Ever mix modified and unmodified?

Hey all - new to this forum - not to tiling (though always learning something with each new job). Next job will be for a single family home w/only one bathroom-in that bathroom. I usually use modified (ultraflex 2 from mapei) on top and wait longer (i know what schluter recommends about using unmodified on top). Keraset is only available locally as an unmodified and I don't want to wait/pay for kerabond to be shipped as well as go get it around 100+ miles.

Skip to the short version - ever thought about mixing modified and unmodified to get a "slight bit" of polymer modified adhesion mixing with the "not as good" stuff? I'm thinking there's not too much issue as we're dealing with sand, cement, and something to slow drying time (add latex . . .) or am I wrong. Or, would you recommend for this job to use the keraset (don't know to much about it but would meet minimum specs).

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Unread 04-22-2010, 10:29 PM   #2
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or just use versabond, which is lightly modified.
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Unread 04-22-2010, 10:39 PM   #3
MDahn
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Similarities to mapei?

Just curious as that is only available 45 miles away - better in terms of distance but would ultraflex 1 compare? Sorry but I've only used mapei and laticrete in my installs and laticrete is no longer available - local shop that gives me a great deal on ditra wants a fortune for ditraset . . .

By saying "or" use versa . . . is that your opinion that it might be OK to use keraset or mix or go another way? I know there is not much info available about this but just curious what I should proceed with
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Unread 04-22-2010, 10:43 PM   #4
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I do only kerdi showers and have successfully used versabond with zero failures. It does void the schluter warranty iffin you care about that.
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Unread 04-23-2010, 05:33 AM   #5
scuttlebuttrp
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If your forced to use a modified thinset, go with the lightest modified available. Ultraflex 1 would be comparable to Versabond.

The stickiness also depends on cement content. Not just thinning out the latex.
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Unread 04-23-2010, 07:34 AM   #6
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It's not a good idea to mix thin-sets especially for what you are talking about. I have done it in a bind when I was miles away from being able to get more or too late at night and I ran out.

For that Schluter lots of installers use Versabond or similar thin-set.
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Unread 04-23-2010, 12:03 PM   #7
tileguynky
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If you can get Mapei, use their Kerabond without any additive. It is a premium grade unmodified and works great with the kerdi and ditra.
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Unread 04-23-2010, 12:50 PM   #8
MDahn
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Thanks

Thanks guys for the input - I would use Kerabond if I could get it locally - I'll probably just use ultraflex 1 but am very nervous about the homeowners not being able to walk on it for a while with it being modified. It is ceramic so at least it should dry faster than a porcelain- I guess I'll tell them to use McDonalds when they wake up . . . I wish I trusted keraset enough for setting - anyone ever used that without failure?
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