Why would I want a concrete mortar-bed as a tile foundation?
A concrete mortar- bed float used as a tile base is superior to Wonder Board, Hardi Board, Dura Board, Green Board, etc. because: 1) it is a waterproof surface unlike most boards which can get mushy and release tiles when wet, 2) unlike boards, a float is seamless which greatly reduces the possibility of the tile cracking as it can along the seam lines of the boards, 3) a float can be made perfectly straight and level allowing the tile to be set plumb and with a tight grout joint.

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