Porcelain tile on OSB


  #1  
Old 03-20-09, 12:10 PM
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Porcelain tile on OSB

Hi all,

I am building a bar in my basement and instead of a brass foot rail/rest, I built a step out of framing lumber and covered it with 3/4 inch OSB. I want to cover it with porcelain tile. My thinset directions says do not apply over OSB. It's solid and should stay dry. Can I use premixed wall mastic to lay the tile on the step?

Thanks,

Bsmtdweller
 
  #2  
Old 03-20-09, 02:15 PM
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You need to cover the OSB with a cement backerboard, and I would not use mastic. Use a powdered thinset.
 
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Old 03-21-09, 06:44 AM
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Either use cement board or an isolation membrane over the osb. You cannot set tile directly to osb, it is far to unstable. Don't use mastic (anything premixed in a bucket) on floors no matter what the instructions say. You can do a search for the mastic nightmares if you like. Use a modified thinset on cement board for floors. See manufacturers instructions for thinset type if you decide to use an isolation membrane.
 
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Old 03-21-09, 10:20 AM
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Thanks all for the info.

Bsmtdweller
 
 

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