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Unread 11-29-2001, 08:16 PM   #1
hart
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I am installing 12 x 12 white marble in a bath, on the floor, spa surround, vanity top and want to install over the existing 2 x 2 tiles on the surround and on the vanity top. It is very stable, can I use an additive in the thinset and eliminate backer board? Please say yes. thanks
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Unread 11-29-2001, 08:39 PM   #2
Bud Cline
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On the surround and vanity top YES.

What's on the floor now?
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Unread 11-29-2001, 09:06 PM   #3
hart
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The floor is chip board over 3/4" plywood. What do I do for the vanity and surround in terms of thinset? White I know but with what additive? Thanks Angela
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Unread 11-30-2001, 06:35 AM   #4
John Bridge
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Hi Angela,

Use a high-flex thin set, modified with polymers already in it. No additives. The back of the sack will tell you whether the material is for tile over tile. TEC, Custom, Mapei, Laticrete are some of the brand names.

The floor is another matter. Nobody around here is particularly fond of "chip board."
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Unread 11-30-2001, 07:35 AM   #5
Bud Cline
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The chip board should be removed and replaced with either ply or 1/2" cement board maybe. Another less expensive option would be to leave things as they are and use 1/4" cement board.
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Unread 11-30-2001, 09:00 AM   #6
Dave Gobis
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Don't forget to use white instead of gray thinset.
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Unread 11-30-2001, 06:57 PM   #7
Rob Z
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Hi Angela

I believe that Schluter allows for the use of its underlayment product DITRA over OSB (oriented strand board).

Their web site is http://www.schluter.com.
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