That is the question.

I'm going to take out the carpet from our living room and install tile. The subfloor is 3/4 OSB. Can I just put tile backer board on top of this or not? If so, should I go 1/2 inch instead of 1/4? I see a lot of conflicting information about this. Most say it's ok, but we talked with the Home Depot guy and he insisted it needs to be plywood. What thoughts?

Thanks!

Mike