Tiling bathroom floor

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Old 04-26-07, 05:22 PM
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Tiling bathroom floor

I'm sure this question has been asked many times before. I have a small bathroom I want to tile with ceramic tile. The floor is 3/4 inch plywood. Floor joists are 2x6. The joist span is 5 feet. I'm thinking of using a membrane like Ditra or Noble's CIS to keep the height of the new floor to a minimum. Do I need to add any additional plywood to the floor?
 
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Old 04-26-07, 08:56 PM
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You really should lay down another layer of BC plywood (3/8"+) over the existing 3/4". You could then lay the Ditra over this. I'm sure a tile pro will chime in shortly.

Are your joists 16" OC?
 
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Old 04-26-07, 10:18 PM
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Yes I forgot to include that, the joists are 16" on center.
 
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Old 04-27-07, 09:22 AM
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Ditra requires 5/8" t&g plywood. My recollection with cis is the same but I'm not positive about that. You have 3/4" but dont say if its t&g. If it is, you are good to go. If its not t&g then another layer of ply would be a good idea. Unofficially, you are probably ok with the 3/4" ply even if it isnt t&g.
 
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Old 04-27-07, 01:30 PM
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Thanks HJ, yes it is t&g.
 
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