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Unread 04-08-2006, 07:51 PM   #1
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Cement Backer + Mortar

First, This is a great forum everyone. Thanks for all of the good advice.

Second, I am redoing my kitchen. I have put down 1/2 ply on top of my subfloor.
now I am bringing in a contractor to do the tile.
However I am worried. He said that it is not necessary to put thinset down when installing the cement backer board.
Is this right??? OR is it always necessary???

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Unread 04-08-2006, 07:58 PM   #2
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Hi New,

Well, the best bet is to follow the manufacturers installation instructions. That said, I think most, if not all, of the backerboards out there require thinset (real thinset in a bag that you mix with water. No "premixed" thinset which is really mastic) to be used to set the CBU. Makle sure the recommended nailing/screwing pattern is followed too!
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Unread 04-08-2006, 07:59 PM   #3
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It is necessary...read the manufacturer's instructions - they are quite explicit. The thinset fills in any minor imperfections on the floor and provides a fully supported decoupling layer. Not doing it voids any warranty from the manufacturer and risks failure. Also make sure he uses the specified alkaline resistant fiberglass reinforcing tape on the seams and leaves a 1/4" at the edges of the room.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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Unread 04-08-2006, 07:59 PM   #4
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Backer board on the floor need thin set no if's and's or butt's. That is the way it is. Go to the web site of the backer board he is going to use and read the directions. Wouldn't settle for anything less or you are asking for possible trouble.

Santa Seattle

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Unread 04-08-2006, 09:58 PM   #5
Charles P
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Their all correct if he doesnt know that, I would get acouple other bids and go with someone else to do the work.Good luck.
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Unread 04-08-2006, 11:26 PM   #6
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See a concensus building?

If he won't use the thinset, don't use him. It's that important.

Go Rutgers!
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Unread 04-09-2006, 09:24 AM   #7
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I replaced a bath floor about 2 years ago that didn't have thinset under the backerboard. I touched up the grout several times within 6 months but it kept coming out. No problems now.

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