The best way to prep outdoor areas is to use cement or cement board
attached to 3/4'' plywood.
1.  Clean the area 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 8'' to secure board.
5.  Tape all seams using 2'' fiberglass mesh tape.
Outdoor Areas
TM
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Outdoors
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