durock cement board and tile adhesives

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Old 07-10-08, 09:16 AM
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durock cement board and tile adhesives

I have layed durock cement board down on bathroom floor to put ceramic tile over. One side of the board says for mortar (rough side) and the other side for mastic (smooth side). I purchased a bucket of premixed thin-set mortar to set the tile.
My 1st question is, is the Thin-set mortar a mastic and to be used on the mastic side of the board (smooth side) or is it a cement mortar and to be used on the mortar side of the board (rough side).:mask:
I also have this issue. If the Thin-set mortar that I bought is a mastic. I have already installed the cement boards down with the mortar side (rough side) facing up. I have installed 6 of the 12" x 12" tile down before realizing that this may be a real issue, so I have stopped to see if I could get some input from ya'll. thanks for your time
 
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Old 07-10-08, 09:44 AM
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Return the premixed thinset for starters. This stuff is not good. You should have used a powder thinset like versabond to adhere the cement board to the floor along with screws. You would then apply your tile. No mastic or premixed should be used.
 
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Old 07-10-08, 10:06 AM
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I have used the durock screws to secure the durock to the plywood flooring. So now should use the powdered mortar to secure the ceramic tile to the durock. Is that correct.

I also wanted to know if that Premixed thinset mortar is the same thing as the mastic or what is the difference.
 
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Old 07-10-08, 10:42 AM
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You need to pull up the durock and reinstall it in a bed of thinset per the manufacturers instructions. Once that is done, you thinset over the board and tile.

Premixed and mastics are just adhesives that have a high failure rate. Return it and get a 50lb bag of real thinset. Real thinset is 100x better then anything in a bucket and it costs less.
 
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