Tile subfloor

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Old 09-29-18, 04:05 AM
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Tile subfloor

Can porcelain tile be laid on top of 5/8" plywood subfloor with Ditra? Only a 7x7' bathroom. 2x8" joist 16" oc. If not, what are the minimums? Thanks
 
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Old 09-29-18, 04:24 AM
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Normally you want about double that thickness for a tile subfloor. How far do the joists go between supports?
 
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Old 09-29-18, 08:05 PM
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The span of the joists is roughly 7'. I asked the question because I downloaded the Schluter Installation Guide and they state a 5/8" minimum plywood subfloor and then their Ditra product and then tile.
 
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Old 09-30-18, 02:54 AM
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Yes, they say 5/8" is a MINIMUM for their product. I personally would never build to a minimum as I need to put a warranty behind. If the option exists, I would bump it up to 3/4" and feel better about it. You also have to look at what size tile you are installing. Smaller format tile will have lots of grout lines and be more subject to movement issues than a large format tile. Porcelain tile is stronger than ceramic.
 
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