Flooring Tile - Porcelain tile on OSB

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bsmtdweller
03-20-09, 01:10 PM
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

HotinOKC
03-20-09, 03:15 PM
You need to cover the OSB with a cement backerboard, and I would not use mastic. Use a powdered thinset.
HeresJohnny
03-21-09, 07:44 AM
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.

bsmtdweller
03-21-09, 11:20 AM
Thanks all for the info.

Bsmtdweller