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#6
03-31-2008, 06:40 AM
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putting the thinset under the backer board makes it super strong and it will keep the floor from flexing and causing the grout and or tile from cracking ..
mainly because you are going over 1x material if you were putting down a layer of plywood you could probabaly get away with out it
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1987 Dual Console / 2007 200 hp E-Tec 
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