1.  Clean the floor of all debris.
2.  Mix latex modified thinset and spread on plywood with 1/4'' to 3/8''                
     trowel.   
3.  Cut and place backerboard on thinset.
4.  Use 1 1/4'' to 1 1/2'' roofing nails every 6 to 8 inches to secure board.
5.  Tape all seams using 2'' fiberglass mesh tape.
6.  Determine layout and patterns.
7.  Tile can then be installed using a 1/4'' square notched trowel or larger.  It    
     is recommended that you use a latex-modified thinset.
8.  Grout after 24 hours.
What Sub-Floor Should I Use For Tile Floors On Plywood?
The main types of sub-floor used today most often for tile on plywood floors include the
following:

3/4" dry pack with wire lath and tar paper
1/2" cement or fiber board
3/8" self-leveling cement
1/4" cement or fiberboard
1/4' Denshield
1/8" Ditra
The most versatile sub-floor used commonly today by do it yourself homeowners would
be the 1/4" or 1/2" cement or fiber board.  It can be cut with a utility blade or diamond
blade grinder.  For a solid tile substrate install the tile backer board the following way:
Warning:  Do not use thinset mortars that are sold pre-mixed in sealed buckets for
any tile project.  It doesn't cure at a reasonable rate or strength.  Do not use tile glue
or adhesives on floor tile or sub-floors.
TM
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touchdowntile.com
Sub-Floor
2011.  Touchdown Tile is a Minnesota tile company.  All rights reserved.  All pictures of installed tile are Touchdown Tile installations.