ceramic tile sub floor


  #1  
Old 01-27-02, 06:42 AM
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ceramic tile sub floor

What is the proper base over wood subfloor for a new upstairs 85 sf bathroom ceramic tiling project?

Do I need 'green board', or is a base of 5/16 plywood underlay (primed to assure adhesion) over the double layer of plywood sufficient? If I need to install green board do I rip up the top layer of the plywood subfloor to maintain finished floor elevation?

On three previous ceramic tiling projects I've used the 5/16, and it has held up great for over 5 years (so far)... but none of these previous jobs have covered as large an area.

Thanks for any advice you can give... don't want the joints to crack
 
  #2  
Old 01-27-02, 08:26 AM
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Hi
Here are the minumum requirements for ceramic tile. 2x10 joists 16 inches on center, with 5/8 ply on top of that. On top of that you should use 1/2 inch concrete board and then the tile. Since you already have 2 layers of plywood, it's probably ok to use 1/4 backer board on top. Green board is for walls only..and in a wet location, it's unsuitable for walls too.
 
 

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